Quick Easy Test For Stuck Open Evap Purge Valve
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- เผยแพร่เมื่อ 5 พ.ย. 2020
- In this video I show a quick and easy way to test to see if an evaporative emissions purge valve is stuck open due to an internal mechanical fault. (The evaporative emissions purge valve is also known as a vapor management valve.)
Step 1: Disconnect the vapor tube going to the valve at the valve. The particular tube that is needed to be disconnected will be the one coming from the evap canister to the purge valve. Typically the evap canister is located near the fuel cell. So this tube will typically run to the rear of the vehicle.
Step 2: Start the engine and allow it to idle. This is important so that vacuum can be applied to the valve. !!! WARNING: BE SURE THE VEHICLE IS IN PARK AND THE PARKING BRAKE IS ON. KEEP THE VEHICLE IN PARK WITH THE PARKING BRAKE APPLIED!!!
Step 3: Disconnect the valve's electrical connector. It is important to do this because the PCM may cause the valve to come on allowing vacuum to pass 0through the valve giving inaccurate test results. It is normal to have the PCM command the valve on. Also, if there is an electrical fault it could cause the valve to stay on allowing vacuum to pass through the valve causing inaccurate test results. A mechanically sound valve should not allow vacuum to pass through it when the valve is not commanded on by the PCM. Disconnecting the valve electrically helps with getting accurate test results by isolating the valve.
Step 4: Place a wet finger over the opening of evap purge valve nipple. No vacuum should be felt. If so, then the valve is stuck open and is faulty. (Do note: in the case of a very small leak, special leak detection equipment may be needed. It's been my experience however, that 99% of the time if the valve is stuck open a leak can be detected in the manner shown in the video.)
Definition of "Normally closed solenoid/valve": A solenoid that is closed when no electrical current is supplied to the valve.
Caution: Keep all ignition sources away from work area. Fuel vapor may be present in tube and valve. Fuel is very flammable. Even with all sources of ignition removed from the area fuel vapor can still ignite via other means. Use extreme caution. Keep a fire extinguisher handy. Work in a well ventilated area. Do test at your own risk!
Caution: Use extreme caution when performing this test. Beware of moving parts that could potentially injure you. Keep your members clear of moving parts. Keep loose garments and jewelry away from moving parts.
Caution: Be sure the vehicle is in park and that the parking brake is applied before performing this test!!
DISCLAIMER
Barbour's Auto Help is not responsible for any damage or personal injury incurred in the process of performing any auto repairs done by you the viewer. Automotive repair is extremely dangerous. Repair your vehicle at your own risk. It is the viewers responsibility to verify all information and procedures as outlined in YOUR REPAIR MANUAL AND OWNERS MANUAL FOR YOUR VEHICLE. Owning and using a repair manual suited for your vehicle is essential for correctly and safely performing ANY repair to your vehicle. Always wear safety glasses and heed all instructions for use applicable to any piece of equipment you may use. Due to circumstances out of the control of Barbours Auto Help, Barbours Auto Help makes no guarantee that by the use of the information given in this video a quality repair will be made. Barbour'sAutoHelp makes no guarantee that the information provided is totally complete, syncronized and accurate. Verify everything using an appropriate repair manual.
USE THE INFORMATION FOUND IN THIS VIDEO AT YOUR OWN RISK! YOU CAN GET HURT. BE CAREFULL. - ยานยนต์และพาหนะ
I love how the connections in this video come right off. I'm trying to remove them right now and it's like concrete.
Yea, after over 20 years in the industry I've never once had to struggle with anything.....ever... lol.
WD-40 help?😂 G🍀L if your still have troubles.
Lol
@@BarboursAutoHelp I'm an appliance repair technician. Same here. Lol
Not over-thought. Short, sweet, efficient, excellent tech tip!
Glad you liked it!
2013 Toyota Tundra. Did this test and it worked! Simple fix as well. Thank you very much my friend.
After watching subpar videos it was a relief to find yours. I do not know how you find the time to answer so many peoples questions listed below. But because of your good faith and help I have subscribed and will watch more videos. Thank you.
That's great. Thank you for subscribing! I appreciate it.
Wish I would have seen this a year ago. Thanks so much for sharing
Much appreciate the help brother! After watching I troubleshooted the problem and replaced the valve
Good job!
Thank you! I really appreciate the help. Your diagnosis worked and was very simple. I had a brand new purge valve installed that I suspected was faulty. I replaced it with another purge valve and it corrected the problem. Was getting a p0456 code and the smell of fuel vapor that I couldn't locate.
Super cool!
Thanks for the video.. I didn't even think about removing the connector and checking the valve.. sure enough, constant very powerful suction..
Great video! right to the point, with good camera work! 10/10!
Much appreciated!
Excellent video you speak very clear and precise and you know as well as I do how important that is. Great job
Thanks for the video. I did this test today and don't have a stuck solenoid. Now, on to the next possible issue.
Appreciate the video buddy. I have the old style OBD1 with the vacuum operated purge.. was tryin to figure out if it was normally closed / normally open. I guess the design theory is when you apply throttle and the manifold vacuum drops, the purge valve opens.. anyways thanks a lot
good thing , aside from testing the wiring for current flow or voltage,
another way to quickly find if it is a stuck open purge valve,
Ow yeah , just don't forget to reset or clear that code if so ever it throws any.
Thanks man for this, gonna see more of your videos sooner, peace!
Everytime i fill my gas up and leave the gas station my rpms fludder down if i come to a redlight. It goes away after a few miles though. No check engine light on. Could this be the purge valve? And do i need to change valve and canister?
Excelente video me sirvió de mucho ya había checado todas las conexiones y no daba con la falla asta que realice la prueba que dijo y listo solucionado lo hice en una gmc canyon 2009
Good diagnostic tip right to the point. Thanks
So simple...
Sharing your knowledge with us is really, really nice and I thank you Sir.
Your welcome.
This is an easy, straightforward way to do a quick test. And a ding of a lot less than a Ford dealer will "hose" (pun intended) me for. If it IS stuck open, is there a danger in essential driving until the new one arrives? (2 days) I heard somewhere that it could fill the canister with gas. And that begs the question, if I don't want vacuum to the canister, can I drive with the hose plugged until the new valve comes? Thanx much for this. Hopefully it saves a trip to a high priced shop.
I always enjoy watching your videos I have done a Ford Edge water pump after watching you do one
That's awesome. Great job!
Thank you for the info sir I was able to diagnose my girlfriends car ,you were a big help
Great tip as always!
Happy to help!
Do you need to reset the fuel trims in the ecu after replacing the faulty valve?
Great video! Thanks!
Great tip! Thank you
My canister purge valve seems to be stuck partially open when unplugged as well, plus the engine idle would bog down some every 10-15 seconds. It eventually caused my fuel tank to implode/shrink while going down the road.
The great video. Thanks alot and Best regard
Thanks for sharing the knowledge.
Go
Thank you for video
Very good explanation!
Appreciate it, Kevin! Thank you.
WOW VERY WELL EXPLAIN THANK U FOR DAT U DA BEST.
Thanks, helping the simple made clear
Glad it helped!
Great explanation, thanks!
Glad it was helpful!
Very Helpful - Thanks Bro !!!
Glad it helped
Thanks for the video!
You're welcome!
Great video thanks for sharing
Thanks for watching!
Anyone know if it's possible for the purge valve to be noisy, yet still operate normally? The car runs perfectly fine and there are no codes, but the purge solenoid makes a lot of noise and I haven't seen this issue before
I have a 2004 f150 XL heritage my question is, can you blow in through the canister purge side when it’s disconnected because I know it’s supposed to be open when it’s connected when I put a vacuum to the intake, engine side on the purge solenoid it holes vacuum, but when I blow in through the other side from the canister purge site when it’s disconnected air goes through and comes out the intake engine side of the purge solenoid ?
I have a 2005 ford ranger my purge valve has a 3rd port that's capped off with a green threaded cap it's on the opposite side of the other 2 ports , I want to say it's a service port? Would that port be where I would test the valve for having vacuum or no vacuum.
Nice content
New subscriber beacause of this
Thanks for the video
You bet
it causes code P2198 in my ford edge. I did this test, and YES!! there is a vaccum with the eletric cable disconnected. the valve is stuck open! thanks, I will buy a new one
Thanks for sharing
Thank you!
You're welcome!
Thank you for sharing
My pleasure
Thank you
I have a question. Can it stop a vehicle from starting? Or have u heard of that before. I have one that finally failed....and my vehicle won’t start. Changed everything, plugs, fuses and sensors then I remember I never got to changing my purge valve that was bad several yrs ago.
Nice video
Thanks
Hello, my Grand Cherokee’s purge valve is making a tapping or ticking noise. Is that normal and indicative of it functioning properly?
2007 Toyota Sequoia check engine light lit up and the other lights as well. Gas cap has been changed, gas cap always is tightened correctly. Now I am told that the Purge Valve is making the check engine light up, nothing to do with the gas cap. The Purge Valve will cost $350-$500 to replace next time the check engine lights up. ~ Fort Smith Arkansas
I test mine same way, disconnect the hose of the gas tank and place a finger in the valve, if you feel vacuum is a fault valve, the valve make a rough idle, shut off when running, hard to start. THANKS
Thank you Barbours Auto
You're welcome!
Will a bad purge valve get a 02 sensor code as well ?
I’m working on a mystery and collecting clues. I have a 1996 Nissan Quest, 140k miles, strong smell of gas in the cabin. I also have a terrible low speed hesitation, it bogs down and noses over when accelerating from a stop. I recently replaced spark plugs, fuel filter, air filter and cleaned the MAF sensor. It got a little better but it’s still pretty bad especially with the a/c on. Any ideas would be greatly appreciated. Thank you
I have a 2014 escape eco boost and I’m smelling evaporated gas through the vents . Could that be the same thing ?
Hey I recently changed my purge valve on my 09 toyota camry and I want to find out how to close it.
Thank you I have a 07 galant and getting p0441 code it wasn’t the gas tank cap tho
i keep getting P0456 on mitsubishi 02 galant went away and back after 3 new gas cap and the oem model but still pops up any suggestions?
What causes purge valve solenoid to have gasoline inside on a 2006 f150 4.6L please help
Hello, can i just turn it off electricaly (plug out) for a test drive, i mean is it safe for car, will not cause some damage??
Thanks bro.
No problem
This might be the issue I’ve been hunting on my civic for 3 months🤞🏻
Good day
My 2009 Ford Expedition with a 5.4 L engine is misfiring rough idle put a scan tool to it gave me a code P0453.
Changed the sensor on top of the fuel tank no leaks in the EVap system. Still doing the same
Damn such amazing videos I got to do this on Spanish! 😃
th-cam.com/video/ZXsQAXx_ao0/w-d-xo.html
th-cam.com/video/5-sfG8BV8wU/w-d-xo.html
How about testing the valve by putting voltage to the valve? Listen for the click
Can this cause a p0430?? Or even a fuel filter that's old or clogged???
I just did the procedure in an 08 explorer 4.6 v8 and it sucked my finger a bit. Not sure if I'm this vehicles the valve should be normally closed or open
So while its running pull the electrical connector off and the vacuum line testing if it's got pressure which is bad
Hey, thanks for your video, I have a 2007 Jeep Grand Cherokee 3.7L V6 4x4, I've gotten both P0455 (large leak) & P0456 (small leak), I will try your test today, but when both codes present, could the purge valve still be the issue?
Yes, a faulty purge valve can cause a large and small leak.
@@BarboursAutoHelp yeah you were right! That fixes it! Thank you!
Could this cause possible lean codes? On my 2015 Chevy Impala I have a check engine light on for lean codes and I hear an air leak in the back of the intake somewhere. It sounds like it's coming from the purge valve but I'm not completely sure
Typically these cause rich codes when the fail like this.
Is it possible to have a faulty purge valve and the truck not throwing any codes?
2018 ford f150 xlt 5.0
Truck doesn’t turn over after stopping to get gas after long (cross country) drives. (Only starts if truck is left to sit for 20-30 minutes)
Good starter, good alternator, good battery, no leaky injectors, fuel pump fuse is good.
So when you say that the vehicle doesn't turn over, to me that means that it's not cranking. Is this what you are saying? The engine is not cranking? That would be what we call a "no crank/ no start" scenario. Now if the vehicle cranks but doesn't start then that is a "crank/ no start" scenario. A stuck open purge valve will not cause a "no crank/ no start" scenario but could possibly cause a "crank/ no start" scenario. But, it's hard to believe that the purge valve could be causing this and not setting a check engine light to come on. That would be one heck of a leak to cause that symptom.
Question. My 04 mustang gt been sputtering when I give it alot of gas. And when you fill up with gas it kicks pump off and you can hear air. So I went to check the purge valve first and the vacuum line to the intake from the purge valve is collapsed. Took it off and it was still sucking but not alot. Put it back on and checked the one to the tank and didn't feel no vacuum from it. Kept it off and it still sputters when hard excellerating. Could it just be the collapsed hose? It still sucks but prob not enough
Maybe you have a misfire. Are you setting any codes?
Only code I'm getting is fuel rail sensor but I've replaced it 3 times with 3 different new ones.
@@michaeldysart2271 Shoot...I'm not sure.
Hi, I have a jaguar xtype 2005,i have code 442,but can not find it??
Subscribing not only for the great info but because we share the same last name.
Thanks a bunch Mr. Barbour!
Question I cleaned mine out the car is running way faster is that what it do?
No videos on crown Victoria evap vent canister please doone
So if it's not pulling a vacuum after it warms up, does that mean it's stuck closed?
my wifes 08 G35 had a P0455 code. i reset code and hasn't come back on yet. can this effect her gas mileage. car used to get 20 mpg, now its gettin 16 over a period of last two years. i am going to replace valve i bought already but hasn't done it yet. p.s all normal maintenance been done including plugs at 96k car has 102k on it. any suggestions?
It's hard to say. There are a lot of factors that can affect fuel economy. I suppose it may be possible but I'm not really sure if that is causing an issue like that.
2001 Audi TT code P0422. Could this be my issue?
Solenoid Purge Valve stuck close how i check it pelase
Can you clean it instead of buying new one?
Thank you very much*********
Do you do the same to the leak detector pump too ???
Are you referring to the expensive leak detector pump that shops use to diagnose evap leaks?
@@BarboursAutoHelp i was trying to show a picture but i can't i was talking under the car i have a 04 chrysler pacifica
Where can i find the purge valve on a mercedes benz 190E 2.3?
I really don't know. Maybe another viewer can answer that.
What about a clicking noise from the cap connected to purge valve when I start my car?
That is the valve opening and closing. They are closed with no current. Open with current.
Where is the purge valve located on a Ford mustang 1997
Thank you for this video. Is Evap Purge Valve the same as Canister Purge Valve/Solenoid?
Yes, it is
Thanks @@BarboursAutoHelp
that's a good video ty.can the purge valve get stuck in the closed position?
Absolutely
My 4.9 bronco runs like crap and wants to die unless I bypass the solenoid and run tube open straight from charcoal canister to intake.
My evap purge valve on my 06 F250 5.4, closed when initially started. Opened after a minute and then closed for a few seconds while running. Is this indicative of a failing valve or does it open and close while running?
Did it do that with the electrical connector connected?
It did shut off with the connector plugged in and the truck running at an idle. It shut of completely when I turned the truck off and tried to blow air through the valve. It was closed. When I disconnected the power it closed everytime. I don’t know if it’s related but I have two issues I am trying to resolve. First the tank will not fill with gas except a tiny bit at a time. Second there is a P0171 lean bank 1 code. I plan to swap the o2 sensors to see if the code switches to the other bank. The fuel I think my be the ball valve at the tank. Just my best guess at this point but I wanted to check all the parts. Also looking at the charcoal canister and valve.
@@rexluongo6470 I'd suspect a possible "bad" evap vent valve or a restriction causing the refueling issue. A stuck open purge valve will not cause the issue with filling the gas tank. Also, if the purge valve is opening and closing with the vehicle running and the valve plugged in electrically then I'd say it's doing what it's meant to do. It's supposed to do that as the PCM commands it on and off. When is the last time the MAF sensor was cleaned?
Is this part the same as a egr vacuum solenoid?
It may work similarly but the egr vacuum solenoid and the evap purge valve are not the same part.
I know they are in 2 different locations but are the purge valve and vent control valve the same part?
no
Hello, Do you know why my engine is not sucking in air? It turns on and runs just fine. I am not getting no air sucked in even when I removed the purge valve. I tested the purge valve by applying voltage and it opens and closes. Thats when I realized that engine is not sucking in air regardless.
What vehicle are you working on and are you sure you checked the right part?
So I have exactly what this guy said. I put gas it ran ruff idles ruff wow
I followed the steps and there was no suction, i plugged the electrical back in while engine was running, and it began sucking air, not sure if that was the right way, but either way i suppose i need to replace it now
It will suck when it is connected if the PCM commands it to come on. That's why you test for suction with it disconnected. It should have no suction with the electrical connector disconnected.
I have a 98 dodge dakota the pcv valve ticks and was bought new why is that?
Maybe a bad part... not sure. When does it click and under what conditions?
I've changed this purge valve 3 times already now I have to change it again,,what's really going on...2007 Yukon denali
Why do you keep replacing it?
@@BarboursAutoHelp check engine light comes on, I take it to Auto Zone. Get it checked and it's the Purge valve again
@@bizkit2147 What code exactly are you getting? What tests have you done?
I did this test and it my purge valve was sucking in air when I put my finger on it, I changed it and it still continues to suck air. Is there something else that would cause this?
Did you disconnect the electrical connector before checking it?
👍
would a stuck open purge valve cause an o2 sensor rich to lean code come up
It sure could..
I have no codes! No engine light!
But have a strong gas odor in cabin
Of 05 Honda Odyssey. Help!
Gas cap?
Hello the was a good video , I recently fix my cooling deposit because it was leaking and now that i put it back in it still gets a almost to the red hot but now it makes this noise like it wants to turn off and the acceleration goes up and down what can it be
Don't know. Have you considered having a tech look at it?