Although it still manages 23-25MPG on the highway, which isn't too bad. The purge valve has been diagnosed as bad, causing the engine to run lean. ) It does not say if it is the Purge Valve or Not. I found this thread searching to see if anyone has eliminated this concoction and just routed the fuel vaper line directly to the turbo inlet, i want to eliminate, the purge valve and purge valve soloenoid. About 3 months ago the fuel economy started to go down and LARGE clouds of black smoke would come out my exhaust under hard acceleration. The attendants have a bad habit of trying to fill the tanks all the way to the top of the fill hose. A weak thermostat will impact fuel economy. At the time I didn't know t. But if better gas mileage is your primary aim, you'll be disappointed with the. 2005 Chevrolet Colorado 2WD 4 cyl, 2. It is important to remember that if your "Check Engine Light" illuminates and someone just simply reads a code of PO420, 421, 430 or 431 this does not necessarily mean the Catalytic Converter is bad! All that code says is either Converter operating below efficency or Converter. Your catalytic converter is an essential part of your car - it neutralizes hazardous compounds in your exhaust such as carbon monoxide. The fuel pump's job is pretty self-explanatory: to pump fuel from the gas tank to the engine. Depending on how/where it's failed. The carb can get clogged up with sludge, which reduced fuel economy and makes for some expensive. Additional details - when I am driving and come to a stop or, immediately after filling the gas tank I can smell gas fumes coming from, or at least I think coming from, the engine compartment. Now the gas mileage is back up to where it was. sinc emy '95 does not have one (just the purge flow valve), I'm not sure how/where it sits. 5 L, Automatic 4-spd. So then: purge valve up front on top of fan, or O2 sensor? Or something else. Symptoms of a bad evap canister can alert any drivers that there is a potential problem occurs that needs to be addressed immediately. The problem is that the brake hydraulic system will release most of the residual pressure so you can drive the car, but it retains a little residual pressure, just enough to make the brakes drag a bit. And no, a bad canister wont affect your mileage by any drastic means. Misfire And Evap Purge Solenoid the car seems to be getting pretty bad gas mileage. Although it still manages 23-25MPG on the highway, which isn't too bad. I tried replace it with dorman rock auto parts, cheap enough to buy to replace a few more times but the codes would come back and so would the symptoms, which is a very unusual fuel trim. Every vehicle has a fuel tank that emits a flammable gas vapor. The gas cap hiss has nothing to do with the functionality of your EVAP system. The IAC valve over time gets dirty and will cause your car to run poorly. Check Engine Light : Cadillac SRX 3. i have noticed that while in idle, i get a heavy odor of gas. I found this thread searching to see if anyone has eliminated this concoction and just routed the fuel vaper line directly to the turbo inlet, i want to eliminate, the purge valve and purge valve soloenoid. The engine’s firing order is 1-6-5-10-2-7-3-8-4-9. That is how I determined mine was running too cool. If these sensors were badthe car would run really bad and you should have a check engine light onBad Gas Mileage And Sensors? I would suggest have the injectors cleaned. Generally on vehicles with over 100,000 miles on them the EGR may either have a clogged or hard to actuate valve that is filled with carbon deposits from years of hot carbon sooty exhaust gas contacting the valve. I've posted before about my rough low idle and declining gas mileage, but now I'm noticing a raw gas smell in the cabin while driving. ummm you MIGHT wanna check your "check engine light" cord b/c my dad knows a guy who cut one one time b/c he couldnt figure out the problem. When Should You Replace the PCV Valve? By Rick Popely. Instead of reaching the combustion chamber, gasoline gets burned up before it engages in the combustion process. The most important of those, is excess fuel entering the engine. I was told the 5. This is a definite indication that this engine is burning oil. I've been running without an IAT and purge valve for awhile. Why Is My Car Using So Much Gas? And the list of culprits behind a decrease in mileage can be rather large: A bad ECT sensor The purge valve controls the flow. According to my research, a code P0420 is registered when a few things trips the ecu into believing the downstream O2 sensor is registering bad Nox readings. The cool thing is that a fried fuel injector can be easily tested with a simple multimeter resistance test, and this article will show you how. GM has been trumpeting the Volt’s 40 mile target AER (all electric range) since it was first announced on January 7, 2007. When my Purge Solenoid went bad my truck was hard to start each time i put gas in it! It would crank like it was out of gas for about 3-4 min. And by doing so, they increase gas mileage and performance. they generally don't stick completely open where it's a vacuum leak and you feel it. Right away I noticed a substantial improvement in my fuel economy. The canister purge valve, also commonly referred to as the purge valve, is an important component of your (EVAP) system. fuel psi if I remember is around 40 either way should be constant what u would be looking for if it was an issue is drastic decrease when engine exhibits mis. Are you looking for a really solid work truck? Something that can handle just about anything you throw at it? Then you need to check our our collection of rare 2nd generation Dodge Ram 2500 Diesel pickups. A bad distributor would definitely cause a rough, erratic, and misfiring idle. Rough idling is commonly caused by bad spark plugs, so problems with the PCV valve are often misdiagnosed. 0l SOHC engine. The list goes on and on, but there are various things that attribute to this problem. This causes the ECM to compensate for the loss by using more gas, hence the poor gas mileage. It has 32000 miles. It will help you improve fuel economy and increase performance with just one application. ” What are the common causes of code P0446 ? Depending on year, make, and model, DTC P0446 may have number of causes. Check Engine Light is on. it's killing my wallet. Purge Valve Stuck Closed. I don't want to spend un-needed money if possible. seems fine. 3 months after i put the K-Pro my gas mileage went from 300 average to 240 average. Here are five things to look out. Any feedback is appreciated. Check injectors to make sure they are closing. As we already mentioned, when the fuel to oxygen ratio is too lean or too rich, your engine becomes less efficient. Repeated P0422. Rough idling is commonly caused by bad spark plugs, so problems with the PCV valve are often misdiagnosed. I use a BAFX dongle for $25 and Torque Pro $5 and you can see and log. Plus, since the code specifies a block/restriction in the purge vapor line, I'm worried that this is a line issue, not a valve issue. Purge valve or O2? the light for the front O2 sensor or really affected gas mileage much, but noticeably affected how the. Purge valve problems. Drop in Fuel Economy. EGR bar was replaced but did not fix the problem. Find Your Miles Per Gallon and Gas Mileage at MPGBuddy. These are all my symptoms that were caused by the EGR Valve being stuck open. Low Fuel Economy. The smoke is so bad I cannot tell what kind of car is beside me. Have you ever found any fluid on the ground? The way this works is the fuel vapor from the fuel tank goes into the canister where the purge valve pulls it into the engine to improve fuel mileage and reduce emissions. BTW, I've had bad purge valve or incorrect purge flow quite a few times. Purge Flow Fault. When that happens, a chemical reaction takes place between the nitrogen and oxygen, creating NOx, or Nitrous Oxide, which is an indirect greenhouse gas. 5 L, Automatic 4-spd. Hey there Poolmanas you probably know I have been battling this for a while, as this turned out to be my problem, (well I think my MAF is on it's way out), but overall it wouldn't be a bad idea to get it checked out, I found a Smog place to do a check on my air intake to see if I had any leaks (10 bucks), which I didn't, so I pin-pointed it to my Purge Valve. BP reported that not every car needed to be serviced — those who bought only a few gallons were able to dilute their bad gas by adding premium unleaded to the tank. The lights finally came on all the time and the X was diagnosed with a bad EGR valve. Right away I noticed a substantial improvement in my fuel economy. If you don't know how to approach this, these codes can have you chasing your tail down all kinds of dead ends. Can copper tubing, cheap magnets and wacky gimmicks really boost your mileage by as much as 300 percent? PM's Mike Allen puts the latest MPG gadgets to the test. The check engine code says an EGR valve but I also had a new engine put in recently. Particularly, the ‘plunger & barrel’ assembly, which relies on. Brand new re-manufactured engine. 0, whatever you want to call it. Bad gas mileage means that your car is not running as efficiently as it could, and it also means you are losing money at the pumps because you are filling. From that very day three years and eight months ago, journalists and enthusiasts have been asking The Big Volt Question: what is its fuel economy […]. We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional. VW has had a. Instead of reaching the combustion chamber, gasoline gets burned up before it engages in the combustion process. Depending on how it failed, it usually is one of two different symptoms. The question then becomes how to get better gas mileage. 5 million 2012–18 Ford Focus vehicles for a problem that could cause the vehicle’s gas tank to become deformed. High fuel pressure. A broken or disconnected purge solenoid is basically the same thing as leaving your gas cap loose which you can do as a replacement for a bad purge solenoid. Poor fuel economy can be exacerbated by a loose gas cap, clogged fuel filters and fuel lines, or clogged injectors. Injector Repair LLC is dedicated to providing the highest quality professional ultrasonic fuel injector cleaning and flow testing service for most automotive, truck, marine, motorcycle, ATV, and snowmobile gasoline fuel injectors. He did a "smoke test" and determined it was the purge valve, coughed up 100 dollars to this ahole just for him to tell me that, he wanted to charge 200 dollars for the part (found it for 120) and it would cost more than 300 total after it was all said and done which I find hard to believe. It's rare for a Honda Civic fuel injector to go BAD, but that doesn't mean it doesn't happen. One of the first symptoms of a problem with the EVAP vent solenoid is an illuminated Check Engine Light. This code could also be caused by any failure of the EVAP system that will cause a large leak. some modifications that will increase your gas mileage include: performance ignition components performance exhaust components such as header(s), and a flowmaster muffler if youre using an air filter, a K&N air filter might help a little bit. 92 foxbody gt running rich all the time. Richard, wouldn't the missing O2 sensor cause the computer to run in "limp home" mode? I ask this because my '93 Blazer Tahoe 4. One of the worst auto repair night mares I ever personally experienced was once replacing a bad alternator. changing the gas cap or the purge valve. Can a bad purge valve cause P0457 code on a 2008 Subaru Forester? Where is the Purge valve on the Forester? Hi! Ju - Subaru Cars & Trucks question. an evap purge valve going bad is when they leak and let fuel vapor from the tank into the manifold and it causes a lean condition when not expected. What I basically want to know is whether NOT fixing it right away can hurt my car. 4 got comparable mileage to the 4. When the engine is cruising and vacuum is high, airflow through the PCV valve is at a maximum to purge the blowby vapors from the crankcase. Every part that the gas touched between the tank and the engine had to be flushed and cleaned as well, since bad fuel had been known to ruin higher-pressure fuel injectors. I can feel the ECU pulling timing like crazy because it is sensing the noisy lifters as knock. Cars are meant to be driven, in my mind. Possibly a bad purge valve or vent valve. You could also just have a fuel leak. When a vehicle suffers from worn valve guides and/or bad valve stem seals, you'll see exhaust smoke during deceleration because the high intake vacuum that occurs during deceleration draws the oil through the worn guides or seals. Not much more in this class than can handle off road like this did I think. 3 Signs Of A Failing Canister Purge Valve The canister purge valve, also commonly referred to as the purge valve, is an important component of your Evaporative Emission Control (EVAP) system. Does a bad purge valve cause gas to run out fast? It has no effect on performance or fuel economy, even when it is malfunctioning. I've since given up gas mileage in favor of performance though hehe. I did have an Evap code for a while P0456. This electronic unit is controlled by the systems computer to allow some amount of fuel stored in the charcoal canister to be burned in the engine. 2012 Ford Focus code P144a changed purge valve but light is still on. It also looks at slow changes like loose gas cap. Ask Question I'm waiting for a new EVAP check valve, as the old one was very leaky. P0442 - This is a Small leak indication. The vent control valve is usually open when the engine is at normal operating temperature, and the purge volume control valve is commanded on when the ECM is ready to burn the built-up fuel vapors. ummm you MIGHT wanna check your "check engine light" cord b/c my dad knows a guy who cut one one time b/c he couldnt figure out the problem. After 50,000 miles or so, OEM carbon-core ignition wires develop too much internal resistance, which weakens the spark and increases the risk of misfire. Replaced purge solenoid an haven't had that problem since. A bad sensor could easily disrupt some engine functions such as engine timing, the air to fuel ratio, and combustion intervals. There are a few clips that you need to find and remove. Does a bad purge valve cause gas to run out fast? It has no effect on performance or fuel economy, even when it is malfunctioning. 5 to 1 mpg. My gas mileage is about 220 miles, and since I use this only to commute between my home and university, its absolutely local roads with the speed limit from 25, 35, to 45, at best. I would rather replace it myself and save my money rather than going to the stealership but I have no idea where the purge valve is. The EGR valve is a component of an automobile’s exhaust circulation system that reduces pollution-causing emissions. The vehicle is still shuddering at a stop light & lurching when accelerating and feels as though the tires are grabbing for traction. 2005 chevy colorado ran diagnostics in a shop results were as follow random misfire on cylinder 2 and 3. Along with keeping at least a quarter tank of gas on hand at all times, it is also a good idea to make sure the filter is replaced on a regular basis. All Honda K24 engines require a valve adjustment at 110K miles --yes this includes 3rd generation CRV's. Gas Cap/Vapor Canister and Gas Mileage. If I put the old gas cap on the odor isn't as bad. Turbocharger can Fail. Overall, I'm at a loss since the mechanics said to replace the charcoal canister and the purge vlave and I'm still having trouble. I replaced all the vacuum hoses in the engine bay, even though none of them looked bad. You're stepping on the gas pedal, but the vehicle isn't gaining speed as before? That could be a sign of a bad fuel pressure sensor. Faulty Evaporative Emission System Purge Valve Evaporative Emission System Purge Valve harness is open or shorted Evaporative Emission System Purge Valve circuit poor electrical connection Blocked fuel vapor tube between the Fuel Tank Pressure (FTP) sensor and the fuel tank. you won't really get much better gas mileage as the "cleaner" burn is more or less cancelled by the loss of burnable. Anyways, I am sitting here just now and I thought, shouldn't have the ""check engine" light come on if the PCV valve was bad??? The PCV valve is part of the valve cover on this mini, so they have to replace the whole cover! Valve cover on internet is just about $400. Top off your tank, run 60 miles or so on the highway, top off your tank again (preferably at the same pump) and see what your mileage is. theres no exhause gas line here. Here are some of the typical symptoms of P0010 in the Ford F150:. When asking at our local Advance Auto it was mentioned that the smell could be from a bad purge valve. This is a discussion on Gas Cap/Vapor Canister and Gas Mileage within the General Help forums, part of the LSx Technical Help Section category; Recently my 98 T/A had a significant reduction in fuel mileage. I've been running without an IAT and purge valve for awhile. Page 1 of 2 - Bad gas milage - posted in 80-96 Ford Truck: I have a 1993 F-150 Flareside that gets horrible gas mileage. 15 Causes of Bad Gas Mileage (and What to Do About It) Ever visit a gas station, calculate the fuel economy for your vehicle and notice it’s a bit lower than what the EPA said it should be? Wondering why your car is burning gas so fast? As cars age, there are many factors that may lead to high fuel consumption. Purge valve problems. Having bad purge valve will not effect the ovrv valve on the tank, and that's what shuts off the fuel when refueling. Here are some of the most common. poorly and get bad gas. Subject: new pcv=bad gas mileage IP: Logged Message: i put a new pcv valve in my 98 3. EGR stands for Exhaust Gas Recirculation and it does exactly as the name suggests; recirculates some of your exhaust gas back into the intake manifold, where it. Furthermore, If your canister purge valve is not opening properly, it may adversely impact your gas mileage. When that happens, a chemical reaction takes place between the nitrogen and oxygen, creating NOx, or Nitrous Oxide, which is an indirect greenhouse gas. I am getting P0441 code and I really need some advice. QUICK NOTE - Valve cover Replacement This is a common repair due to cracks in the composite valve covers and leaky gaskets. 3 months after i put the K-Pro my gas mileage went from 300 average to 240 average. Every vehicle has a fuel tank that emits a flammable gas vapor. Drop in Fuel Economy. You're stepping on the gas pedal, but the vehicle isn't gaining speed as before? That could be a sign of a bad fuel pressure sensor. The only way to fix it is to replace it. If the charcoal canister were to go bad, there would be an array of problems like power reduction, fuel odor, more pinging, lower fuel economy, and flooding. The valve holds vacuum on the side running to the intake (as it should when not engaged) - but allows air through if you pull vacuum on the canister side. 5 million 2012–18 Ford Focus vehicles for a problem that could cause the vehicle’s gas tank to become deformed. Open the gas line and bleed it (p ressing control knob in) for not more than 1 - 2 minutes or until you smell gas. Here's the thing: I'm returning the car next month (lease is up) and really don't want to spend the money to repair it. Possible symptoms of a bad IAC is irregular rpms, car stalling, and it will cause you to waste more gas than necessary. checked engine timing. 06 mpg with the ProCharger. I have ran through a couple bottles of iso-heat and it went up another. Here are some of the most common. Don't go too long without fixing your Vapor Canister Purge Solenoid Valve here's why. It consists of activated carbon -- a substance with an extremely large effective surface area (due to its pores and/or granular structure) -- which stores fuel vapors. It is getting poor gas mileage. This may cause the "Check Engine" warning light to come on. If your canister purge valve isn't opening correctly, it may adversely affect your gas mileage. 92 foxbody gt running rich all the time. As we already mentioned, when the fuel to oxygen ratio is too lean or too rich, your engine becomes less efficient. A bad valve. I have have been dealing with this P0171 diagnostic trouble code for many years on many different year make and model vehicles. MAF Sensor cleaning to improve gas mileage! I recently read an article from this month's Consumer Reports which talks about how a dirty MAF sensor can decrease fuel economy. Adding extra oxygen in the gasoline will disrupt the proper operation of the system because the computer does not expect oxygen to be in the fuel and does its calculations without considering the new addition. So for months now, I've had a bad EVAP purge valve and I finally ordered one and replaced it on the weekend. HW41 CHECK EVAP CANISTER PURGE VALVE CIRCUIT INTERMITTENT OPEN OR SHORT. According to the guy at Autozone, the reason my check engine light is on is due to a bad purge valve. 3 different shops could not find out the exact problem. Improved gas mileage is good for you, good for your car and good for the environment. The best way to minimize or eliminate. if it's on the back it isn't bad. 7L Grand Cherokee 2004 or below). When the vent valve and purge valve are closed, the evaporative canister will store vapors until the vents are opened. then it would start. Jump to Latest PCV system is garbage, contaminating the intake and maybe the MAP Sensor, bad EGR Valve, and wrong weight oil put in by uncaring. the only other problem i really had was the evap purge valve, which i. 73 gears) it routinely got 29-30MPG on the highway. If it is a high or low circuit code along with a contribution code, there is either a wiring problem or an injector spool valve problem. Stuck open, the purge valve would introduce too much fresh air into the engine and alter the fuel/air ratio, causing a rough idle and difficulty starting. I replaced the $25 EVAP EMIS CNSTR PURGE SOL(ACDelco #214-2320) that my dealer wanted to charge me $250 to replace. Try to start it up, will turn over, but will not start for a couple seconds. So for months now, I've had a bad EVAP purge valve and I finally ordered one and replaced it on the weekend. In this guide, you'll find many of the components that, when going bad, will usually cause engine rough idle problems. The valve was replaced (for free eventhough out of warranty. Bad Vapor Canister Purge Valve Symptoms. And no, a bad canister wont affect your mileage by any drastic means. The purge solenoid is basically the on/off switch for a fuel vapor recapture system. if it's on the back it isn't bad. Typically, the replacement cost for a bad purge valve ranges between $130 - $180, including labor charges, while the repair cost will vary depending upon the amount of work that needs to be done. It may seem counter-intuitive when you’re trying to save money on fuel, but choosing a higher grade of fuel can ultimately make for fuel savings. I replaced the $25 EVAP EMIS CNSTR PURGE SOL(ACDelco #214-2320) that my dealer wanted to charge me $250 to replace. I remember bone saying that remoing the charcoal canister you would loose the free gas/vapors. It was the EGR valve's. The fuel vapors your car usually uses for combustion will end up vented through the EVAP canister instead. The cat could be bad, the ecu could be bad, their could be a broken valve mixing oil and gas inside the engine giving off gasses which are bad, or lastlybad gasoline. I found this thread searching to see if anyone has eliminated this concoction and just routed the fuel vaper line directly to the turbo inlet, i want to eliminate, the purge valve and purge valve soloenoid. I think what Jeff is saying is the low rpm creates a lower intake vacuum and the power valve opens during part throttle reducing fuel mileage. This system restricts the fuel vapours created in your fuel tank from escaping into the atmosphere by trapping them in a charcoal canister. My driving habits are the same as best I can tell but my mileage seems to have dropped about a mile per gal. Usually, a poor purge solenoid will display a few symptoms that may alert the driver a possible problem has occurred and has to be serviced. 0-liter GTDI engines may have a malfunctioning canister purge valve that can become stuck in the open position. If the fuel pressure is out of spec the engine runs rich or lean until the O2 sensor compensates if the range is not that far out of spec. The purge valve also stores the fuel vapors for future combustion, allowing it to be recycled back into the engine combustion process when needed. I am assuming this has to do with the reason the engine idles rough and worse when there is a load put on it. Bad gas cap or Purge Solenoid? now with the new Purge Valve in, so far, I haven't had the gas cap message pop up in the DIC. First check to see if your vehicle is under recall at the GM recall web. I did have an Evap code for a while P0456. I've been running without an IAT and purge valve for awhile. Here's how to test a purge valve (YouTube). It's really easy to replace. I remember bone saying that remoing the charcoal canister you would loose the free gas/vapors. It may seem counter-intuitive when you’re trying to save money on fuel, but choosing a higher grade of fuel can ultimately make for fuel savings. Yes, that is one of the very common symptoms when the purge valve goes bad. Instead of reaching the combustion chamber, gasoline gets burned up before it engages in the combustion process. Bad spark plug wires are another common cause of misfires. Rough idling is commonly caused by bad spark plugs, so problems with the PCV valve are often misdiagnosed. But if better gas mileage is your primary aim, you'll be disappointed with the. It has to get real bad before it throws a code. Low Fuel Economy. In addition, to power reduction, fuel odor, more pinging, lower fuel economy, and flooding. My wife's 2006 EX Pilot 4WD has 120,000 miles and runs great overall. VW has had a. I've been running without an IAT and purge valve for awhile. I was reading a haynes and it does put the vapors in the IM so that makes sense. Understandably, consumers are a little skeptical when an exhaust kit claims to both increase horsepower AND improve gas mileage. P0446 code means that the computer has detected a short in the vent control valve circuit. If your vehicle displays any of the following trouble codes: P0420, P0421, P0422, P0423, P0424, P0430, P0431, P0432, P0433, P0434, you’re looking at a problem with the catalytic converter. There's one on each side of the engine. The check gas cap light/evap is on in my 2003 Ford Taurus… My mechanic from Ford has run the test several times and found nothing and the light won’t reset. First off, a little history on why I decided to change the EGR and PCV valves. You need only modify the fuel sending unit of the vehicle. I did a search on what could be causing bad gas-mileage (I am getting around 18mpg) in my 99 LS Auto teg w/ 130k and I came up with spark plugs/wires, cap/rotor, air filter, fuel filter, fuel injector cleaner, and a valve adjustment. The vent control valve is normally opened when the engine is on, and the purge volume control valve is normally closed and is controlled by the ECM to open when it is ready to purge the stored fuel vapors from the charcoal canister. Effect of loss of fuel tank vapours on mileage. In some cars, a stuck-open purge valve can cause difficulty starting right after refueling at a gas station: for the first few seconds the engine may run rough and stumble. Check for trouble codes in your car to diagnose a faulty fuel system. Instead of reaching the combustion chamber, gasoline gets burned up before it engages in the combustion process. If your EVAP purge valve holds vacuum on the intake side, is there any other way it could be bad? Mine is on quite often (clicking), not sure if its too often or not. If the purge valve fails, it can cause a number of problems. I have have been dealing with this P0171 diagnostic trouble code for many years on many different year make and model vehicles. While at the dealer, neither light would come on and the computer wouldn't register any problems. The wrong PCV valve for an application can flow too much or too little air causing driveability problems. The fuel vapors your car usually uses for combustion will end up vented through the EVAP canister instead. DTC P0446 is defined as “Evaporative Emission (EVAP) Vent Control Circuit Malfunction. One symptom of this type of leak might be reduced gas mileage. For those who don't know, the EGR, Exhaust Gas Recirculation, system takes some of the exhaust gas and reintroduces it into the intake manifold. I've posted before about my rough low idle and declining gas mileage, but now I'm noticing a raw gas smell in the cabin while driving. Poor alignment, along with under-inflated tires, can cause bad fuel mileage and tires with uneven wear patterns. A properly working EVAP system traps the fuel vapors in the charcoal canister whenever the engine is off. According to several others that own 05 Taurus's, they are getting 22 MPG city, and 28 MPG hwy. The smoke is so bad I cannot tell what kind of car is beside me. Low Fuel Economy. today i'm gonna get a new PCV valve and get back to. If you want to know how to improve fuel economy, aim for the obvious in your fuel consumption habits and be willing to try what you haven’t tried. when the light on, it get bad gas mileage. However, the "off" condition was done with the windows open which, of course, increases air drag on the vehicle. Can a bad purge valve cause P0457 code on a 2008 Subaru Forester? Where is the Purge valve on the Forester? Hi! Ju - Subaru Cars & Trucks question. We're talking 2,500+ degrees Fahrenheit hot. One symptom of this type of leak might be reduced gas mileage. The valve was not. The valves will become quiet as they get tighter. And by doing so, they increase gas mileage and performance. You wouldn't think it would, but it does. What causes the power valve to start leaking is usually it gets ruptured by a backfire through the carb. I don't have the. Wow, that's nice gas mileage! I wish my beast would do that still, but no more hehe. well it simply just stores vapors until the purge valve opens under optimal condition to let the fuel vapors into the IM to be burned with I would think would give you better gas mileage and of course help polution. If it is a high or low circuit code along with a contribution code, there is either a wiring problem or an injector spool valve problem. The vent control valve is normally opened when the engine is on, and the purge volume control valve is normally closed and is controlled by the ECM to open when it is ready to purge the stored fuel vapors from the charcoal canister. I dont smell gas though. the stumble off idle is gone and idles like a kitten, but the gas mileage is still not the best and now when I turn the fan switch on, the motor stumbles to the point of dying during idle, if turned on while at driving speed there is a significant lag in power and extremely noticible drop in gas mileage. If it gets stuck open, you have purge flow and it wouldn't affect the mileage as much but. GM has been trumpeting the Volt’s 40 mile target AER (all electric range) since it was first announced on January 7, 2007. This lead to the assumtion that the throtle position sensor was going bad. The automaker says car equipped with 2. Does the egr valve affect your gas mileage? Answer. its the shut off valve or the purge valve. I ended up going to Autozone and they used their OBD Scanner and it said the cause for it to be on is the Purge Valve. So for months now, I've had a bad EVAP purge valve and I finally ordered one and replaced it on the weekend. If the computer detects an issue with the EVAP vent solenoid signal. The carb can get clogged up with sludge, which reduced fuel economy and makes for some expensive. The gas engine produces much more heat that rises up into the cabin. ) It does not say if it is the Purge Valve or Not. What causes the power valve to start leaking is usually it gets ruptured by a backfire through the carb. There are a few clips that you need to find and remove. recently i have had to replace my MAF and also my two rear O2 sensors due to codes "SES" light. Fuse/Wiring Problems– If the wiring going to the valve has been compromise, it’ll lead to the P0449. 1) Check exhaust. Vapor Canister Purge Valve- One of the most common causes of the P0456 code is the vapor canister purge valve. 3 Signs Of A Failing Canister Purge Valve The canister purge valve, also commonly referred to as the purge valve, is an important component of your Evaporative Emission Control (EVAP) system. Purge Valve Stuck Open. The most common symptoms of a bad exhaust gas recirculation valve are rough or misfiring idle, detonation, stalling and hard starting. COM — Are you experiencing sputtering and other uncontrollable noises, perhaps a bit of sluggishness when driving your car? You may have bad gas, and you’re not alone. However, ONE bad tank of diesel fuel (water, gasoline, poor filtration, etc) can immediately and permanently damage the fuel side. The vacuum lines appear to be OK. If these sensors were badthe car would run really bad and you should have a check engine light onBad Gas Mileage And Sensors? I would suggest have the injectors cleaned. Ok, my lifters are SOOOO noisy that it has started to effect my fuel economy. an evap purge valve going bad is when they leak and let fuel vapor from the tank into the manifold and it causes a lean condition when not expected. It's important to note that PCV valves are sized for specific engine applications. Why is My Gas Mileage so Bad? Here are a few answers and some suggestions to remedy this issue. Gas mileage went from 17. 3) Damaged Gaskets A normally functioning purge valve releases fuel vapors into the charcoal canister, where they are stored until they are recycled. That gas cools the air and fuel and reduces the formation of nitrogen oxide (NOx)—the stuff that makes smog. You can expect to pay anywhere from $191 to $560 to replace a charcoal canister in a car. It is essential that this piece functions properly and efficiently because a bad PCV valve can affect the overall performance of your vehicle. • Bad spark-plug wires: $100 to $300 depending on cost of parts and labor to replace.