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Pampered-Z · 08-13-2009, 11:30 AM

First, double check that the PCV is working properly. Also you might want to clean the ICM. That little $5 PCV can really mess with how the car runs. Idle controls get clogged over time, and also check for any cracked vacuum hoses before you start looking at the EGR.

Next, with the engine cooled off, reach back ( not easy to do ) and depress the plunger/diaphram about 5-6 times and see if it's sticking or returns freely (Carbon build up and also keep it from sealing).

Next, the EGR is controlled by a solenoid located on the back of the drivers side intake - can be seen in the pick that was posted - Unplug the hose from the intake to the solenoid and plug the line ( a golf Tee fits nicely ). Then drive the car if it runs/idles better ( and will eventually throw a code ) then the EGR is the problem. If the EGR is sticking sometimes this will keep it closed?

Not uncommon for the various ports get clogged, you might want to Seafoam the engine, or remove the EGR and clean it. If not you have to remove the intake to really get it all cleaned our - or go the block off plate.

The EGR valve is only opened at certain throttle % or MPH, typically at crusing speeds and it lowers cylinder temps. If you use the car for long distance driving at constant highway speed you should probably keep the EGR to help with the longevity of the engine

08-13-2009, 11:30 AM	#16
Pampered-Z Sliderule / Moderator Join Date: Oct 2004 Location: Catawissa PA Posts: 2,294 iTrader: (1)	First, double check that the PCV is working properly. Also you might want to clean the ICM. That little $5 PCV can really mess with how the car runs. Idle controls get clogged over time, and also check for any cracked vacuum hoses before you start looking at the EGR. Next, with the engine cooled off, reach back ( not easy to do ) and depress the plunger/diaphram about 5-6 times and see if it's sticking or returns freely (Carbon build up and also keep it from sealing). Next, the EGR is controlled by a solenoid located on the back of the drivers side intake - can be seen in the pick that was posted - Unplug the hose from the intake to the solenoid and plug the line ( a golf Tee fits nicely ). Then drive the car if it runs/idles better ( and will eventually throw a code ) then the EGR is the problem. If the EGR is sticking sometimes this will keep it closed? Not uncommon for the various ports get clogged, you might want to Seafoam the engine, or remove the EGR and clean it. If not you have to remove the intake to really get it all cleaned our - or go the block off plate. The EGR valve is only opened at certain throttle % or MPH, typically at crusing speeds and it lowers cylinder temps. If you use the car for long distance driving at constant highway speed you should probably keep the EGR to help with the longevity of the engine __________________ 93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada 1) Build it 2) Race it 3) Break it 4) Repeat!!!