EGR valve

Hello,

The EGR valve is located at the rear of the engine here is a video to help you test it and the location of the valve in the diagrams below.

https://youtu.be/DqUCbbKdWf4

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.

I own a 2001 Pontiac Grand Prix GTP - Supercharged 3.8L with 155K miles. Trusty AutoZone seems to indicate my "Check Engine" light is a bad EGR Valve (Could just be clogged, or I might need a new one). I've scoured the internet, and cant find any pictures that show me where to look for the valve.

To be honest, I usually don't work on cars myself, but have decided to 'take the plunge' and try this myself.

Please let me know where to look for the valve, and if you can point me to a picture somewhere that would be great.

I spent $30 on an online repair manual that was useless to me...

Thanks for your help!!

Top right rear of engine near the throttle body. Assuming that it is vin code 1. Check the 8th digit if the vin #

I was told that my egr valve needs replacing. Where is it located and cna I replace it?

EXHAUST GAS RECIRCULATION (EGR) VALVE REPLACEMENT REMOVAL PROCEDURE

1.Disconnect the exhaust gas recirculation (EGR) valve electrical connector. 2.Remove the EGR valve nuts (1). 3.Remove the EGR valve (2). 4.Remove the gasket (3) from the EGR valve adapter. 5.Clean the EGR valve gasket mating surfaces. INSTALLATION PROCEDURE 1.Install a new EGR valve gasket (3). 2.Install the EGR valve (2). 3.Install the EGR valve nuts (1). NOTE: Refer to Fastener Notice in Service Precautions. Tighten the nuts to 25 N.m (18 lb ft) . 4.Connect the EGR valve electrical connector.

egr valve is at top right rear of engine near the throttle body

How do I replace/clean the EGR valve and where is the location of this valve?

The EGR valve is on the top right rear of the engine, near the throttle body.



Unplug the vacuum hose or electrical connector from the top of the valve, depending on your particular model.

Unscrew and remove the two mounting valve-to-engine bolts using a wrench or ratchet and socket.

Disconnect the pipe from the bottom of the EGR valve using a wrench or adjustable wrench, being careful not to damage the connecting nut.

Lift the valve away from the engine compartment and remove the gasket.

Detach the EGR solenoid from the top of the valve, if your particular model comes equipped with one. Remove the four screws using a Phillips screwdriver.

Clean the EGR Valve

Remove carbon deposits from the bottom passage on the valve using a scratch awl.

Remove carbon deposits from the pipe and engine valve passages using the scratch awl.

Remove any gasket material from the bottom of the valve and engine-mounting base using a plastic scraper to avoid damage to the mating surfaces.

Install the EGR Valve

Attach the EGR solenoid to the top of the valve, if your particular model comes equipped with one.

Set the valve in place on the engine, along with a new gasket if necessary.

Start the two mounting valve-to-engine bolts by hand to avoid thread damage.

Start the pipe-to-valve nut by hand to avoid thread damage.

Tighten the two mounting bolts and the pipe nut.

Plug the vacuum hose or the valve sensor electrical connector.

recently i had the head gasket replaced and the egr valve the first one started to meld and there was whistling when you stepped on the gas, had a second one put on it is also starting to meld and still whistling. Can anyone help with this?

Sounds like its clogged-up -try cleaning out the ports thoroughly and see what happens

i guess just a dumb question but where are they located

just to add to ras, have the cat converter checked. if it is blocked, it will send all exhaust to the egr port overheating it. it would also explain the whistling.

Roy

that sounds like what it is had it disconnected and no more whistling and runs a lot better

good luck

Roy

My engine is the non-supercharged 3.8L. I just replaced my upper intake manifold due to warping that caused a coolant leak. This included removing the fuel rail and cleaning most of the top side of the engine. After putting everything back together I discover that it seems like my engine is starving for air in the vacuum lines. When I remove my oil cap there is a ton of suction through the valve cover. From my experience this has something to do with the EGR valve being plugged or not working. Could you give me heads up on how this might have happened while I was replacing my upperintake? is it possible that I could have spilled coolant into the EGR valve tube?

If you used ANY RTV sealant on the intake manifold gasket you may have clogged up some vacuum lines in the intake manifold.
The intake gasket should be put on dry after cleaning surfaces.

In any case I think you will have to remove the intake, clean it and replace the gasket.

I have seen some mechanics drill a small hole in the oil cap tube, but I would not.

EGR should not flow at idle, if it flowed it would cause engine to die.

guess got a little to excited. any other ideas. took off cat and just ran straight pipe before pouring more money in, but still whistling.

The gasket for the intake is a plastic piece that has a rubber insert so I did not use any extra sealant. I suspect you are right that I will have to take it off again which sucks but it will go twice as fast this time around. Would it be possible to get a bit more explanation as to how the vacuum system works and what it should be doing? It seems to me like something is plugged up somewhere.

The MAP sensor gets vacuum from small lines in intake manifold for example.

Something has clogged a line somewhere, old gasket pieces etc.

I have seen this same symptom, where there is a LARGE sucking sound when you remove the oil cap.
But this guy coated both sides of the gasket with RTV. In this case the intake manifold had to be replaced, because the RTV had clogged up the passages so bad I could not get it out.

I would remove the manifold and blow out ALL the passages with compressed air. Make sure feel the air come out the other end.

Not to step on your toes but I am sure glad I didn't take that whole upper intake off again. I was missing the bottom o-ring on the PCV valve. The new UIM came with the top o-ring for the PCV valve but not the lower o-ring. I didn't think to check it. Thank goodness its easy to get to. So for anyone who may have come across this issue by searching for it, Check your o-rings on your PCV Valve.

Good catch. The disadvantage we have is not being there, but I'm glad you found it......mmprince4000

How do you know when the EGR valve is bad? What are the symptoms? The reason I ask is the car started running rough and idleing rough. I had it checked out and they said it was misfiring and the catylitic converter was cloged. Changed the spark plugs and replaced the converter. It runs better but has an irratic idle and boggs out at 4000 rpms and when driving has slow pick up and boggs down when I stop the car almost stalling the car. That is why I think it might be the egr valve.
Thanks for any help.

The symptoms you described could be caused by the EGR valve and other components. Clean it out and to include the IACV and see what happens.

Other Category problem
1997 Pontiac Grand Prix V6 Two Wheel Drive Automatic 185000 miles
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3100 Engine......The code reader always says "Insufficient airflow to egr valve." The egr valve was replaced 4 years ago and has 50000 miles on it - seems a little early for it to go bad. I have taken the egr valve out and cleaned it/blown it out. I have also sprayed Seafoam into the tube and manifold passages AND blown them out as well.

What else could cause this message??

if you look at the hole in the middle of the egr real close you can see if it is working by pushing down on the valve its spring loaded just push it and see if it returns to seal .but the passege sounds like your problem to clean it you have to take off your throttle body and egr its hard to do yous hangers to clean it it will be all carboned up spraying wont do it you have to scrap it all out

1999 PONTIAC GRAND PRIX 3.1L 153,000miles

I Need to replace the EGR valve b/c the code reads it for my smog.

Is this something I can replace myself if i order the parts or must i go to a professional??

Parts: Gasket & EGR valve right?

This is definelty something you could do yourself with the right tools and just a lil time. I'm not familiar with the 99 grand prix so I can't walk you through it but I would check with your local auto parts store and ask what all you will need to change the EGR valve.

got a code to replace egr valve and did. It made it better but did not fix the problem,loss of power ,dogs up hills and wont increase speed if givin to much gas.
could it be the covertor? or what?

Cat. converter probably clogged or EGR passageway may be clogged with carbon build-up. Clean out the passageway and have converter flow tested.

1999 Pontiac Grand Prix, 3.1L V6 158,000 mi. Check engine light is on. Fault indicated EGR insufficient. Should I replace the EGR Valve?

Try opening up the EGR and look for carbon and insure its getting vacuum before you replace it. and retry.

car will not start ,had diag. and it read it was that.

See below

just replaced an egr valve of a 1995 pontiac, since the engine light was on and this was shown to be the problem. The car is running better, however, light is still on occassionally..why?

Sounds like the EGR tube may be getting clogged as well. Are you getting the EGR flow insufficient code?

If so, that EGR tube is your likely culprit. It's easily cleaned with some carburetor cleaner and a stiff-bristled pipe cleaner.

ok i turn on my car sometimes and my car does not idle right the idle jumps around and then when i hit the gas then idle levels off and evrything is off. sometimes the car is hard to start and ideling is rough.
My check engine light came on and code said egr valve stuck open.

Is this 3.1 or 3.8 ??????? When the EGR stays open due to carbon it dilutes the A/F mix causing it to idle erratically.

you think i should change it cause i tried to clean it and i changed the gasket and still samne thing

you can try to clean it with a small amount of carb cleaner, but i highly suggest replacing the egr valve.

When at idle and EGR disconnected does it idle okay-if you replace it and it continues-check the wiring and the PCM.