My 1995 camaro has a DTC #32. Which is a EGR system somthing or other does anyone know what this could be? What should be done to troubleshoot this?

 

The EGR is a diaphragm that is openend by vacuum. The vacuum line is opened and closed to the EGR by a solenoid controlled by the PCM. The solenoid is opened using a square wave of varying duty cycle. This duty cycle is calculated by the PCM using ECT, MAF, IAT and RPM data.

Things that can effect the operation are the park/neutral position switch since the EGR is disabled in park or neutral. Exhaust back pressure or the lack there of can effect the EGR. Look for exhaust leaks. Pull the EGR and try to see the passages where the pintle is located. (good luck on that one with a mirror and a light). Apply a vacuum to the EGR valve and see if the pintle moves and that the vacuum can be held for at least 20 seconds.

On a side note. It is interesting to note and I quote from the shop manual. "When the engine is started, exhaust backpressure at the base of the EGR valve should open the valve's internal bleed and vent the applied vacuum allowing the valve to seat."

This could explain why some engines like my 99 pick up that idle rough. Since I have no cats and headers, there may be not enough back pressure to close the EGR. How very interesting.

Another thought is the exhaust port used to accomplish this is plugged and won't allow the valve to seat all the way. I hope you gained as much from this as I did. LOL

Dave