Hello F-body fans. I got a problem with my computer in my 91Z28 1LE camaro. It's got the 5.7 automatic in it. Anyways i've had this same problem with 5 other chevrolet camaro cars i've had before. Can't seem to figure out whats causin the problem. I think it has to do with the EGR. Anyways after drive the car on the freeway for 10 minutes or more that annoying code 32 comes on. The only mods of the exhaust is a 3inch Borla Exhaust. I checked some the vacuum hookups and look fine. I haven't checked voltage or exact vacuum. I just want to know where to start so i can get an accurate diagnostic. Thanks if anyone of you can help out.

 

Hey, keep bumping you post to the top...I seem to recall a concensus that the SD cars have a code 32 issue, not sure what the resolution is, but it seems to be a common problem for the '90-'92's.

Sorry I can't help, you could try a search the archives in TPI Forum for Code 32, may lead to some help.

 

ORAY,

Forget about blaming the ECM. It's doing exactly what it is supposed to do. Your EGR valve operates from a porterd intake vacuum source, switched by a solenoid valve, then controlled by a pilot valve within the EGR itself.

You likely have a positive backpressure EGR valve, which requires a bit of exhaust system backpressure to close teh pilot valve and allow the EGR to open. Until there is adequate pressure, the EGR will not operate when expected and will set the DTC (normally at part-throttle cruise).

Check the top of the EGR valve diaphragm housing for a "N" or "P" stamped in it hear or immediately following the part number. You should have one of these:





Changing the exhaust to reduce backpressure may have had some unintended results. You may need to change the EGR valve to a ported type that doesn't have the pilot valve, but may also have a hard time finding one with the temperature switch mounting provision.

It is possible that your EGR valve or EGR diagnostic temperature switch had failed, but that would be pretty coincidental.