Results 1 to 2 of 2
05-26-2008, 09:49 AM #1
- Join Date
- Jul 2007
Rough Idle-EGR Diagnosis '94 suburban
Stock 94 sububan, 2WD, 350 V8.
The check ingine light comes on after 20 minutes of driving, pulled codes using paper clip method and EGR is suspect.
Using the Chilton's manual I performed the 2 checks they describe for checking the EGR.
1. With truck idling. Use vacuum pump on the EGR to see if idle changes. The vacuum made the truck idle real rough, if this happens EGR is good.
2. Unplug vacuum line on intake side of EGR and test for leakage, no leakaage detected.
So, my question is, what next. The manual says to take vehicle to a dealer or repair shop to diagnose ECM.
Any other options??
06-07-2008, 08:27 PM #2
- Join Date
- Jun 2008
- Union Grove, Wi.
I'm very interested to hear anything on this subject also. I have the same exact problem in my 95.
By lilmissme in forum Chevy Colorado Forum (GMC Canyon)Replies: 3Last Post: 07-09-2011, 02:19 PM
By RATRODKING in forum GM PowertrainReplies: 19Last Post: 05-03-2010, 03:21 AM
By willardearl76 in forum General Chevy & GM Tech QuestionsReplies: 2Last Post: 04-07-2010, 09:38 AM
By 1990Suburban in forum General Chevy & GM Tech QuestionsReplies: 3Last Post: 08-31-2009, 01:02 PM
By RLawns in forum General Chevy & GM Tech QuestionsReplies: 7Last Post: 02-03-2009, 12:11 PM
Tags for this Thread