1992 GTA 5.7L

I'm getting CODE 32 (EGR) after I've been on the highway about 15-20 minutes...give or take.

It does not throw a 32 when driving around town...and if I stop for a little while (like refuelling) the code will reset itself (SES light goes out...code is still posted).

I have checked and have no vacuum leaks. The car has 123500 on the clock (incase this matters)

What is the most common cause for 32's? EGR valve? EGR Solenoid? Both??

 

My dad's 85 IROC did the same thing. The most common cause is the EGR valve itself. After that many miles, the passages in the unit get pretty full of carbon buildup. If you choose to replace it, don't bother with the autozone unit. The selective washers that it comes with never work the way it is intended. Go with a dealer unit and there will be no problems.

 

Thanks for the reply! I was told by one of the guys at a local NAPA that carbon buildup is a problem in those engines after they get higher miles on them. I'll go with a GM replacement EGR valve...doing this I can be sure I'll be getting a negative backpressure valve.

This would not be the first carbon issue I've had with this car. The first was a noisy distributor. (it squealed like a mad pig) The problem was carbon flecks up the shaft, restricting oil from lubricating the bearings....a stripdown and a good cleaning of the housing/shaft took care of that problem.

Carbon buildup is a pain....

 

Just thought I'd post for anyone interested: The fix was indeed a new EGR valve. The old one had a ruptured diaphragm and wouldn't hold vacuum. Just installed and tested it last night. No more CODE 32's!!!

On a side note, I used all GM parts (EGR valve and gaskets)...and got them CHEAPER then I could have gotten no-name stuff from Autozone

It pays to be in good with your parts guy at the dealership!

Dave