All of the recent activity pertaining to EGR troubles has reminded me of an instance our shop delt with a few years ago. Instead of posting this in an existing thread I thought I would start a new one in an effort to reach more members:
The vehicle in question was a 96 80 series that had a check-engine light triggered by an EGR malfunction. One of our master techs battled the damn thing for several days and numerous visits. He did all of the standard "fixes" that have been posted here ad-infinum.
He was about ready to push the SOB outside and set it on fire when he came to me. "are you driving your Cruiser today?" he asked. Smart a$$ me said, "Am I at work?" He said "let me under the hood. I want to look at something"
Off we go to my vehicle. I opened the hood and he went straight for the vacuum hose that leads from the EGR valve to the intake plenum. On the surface it appears that this hose is drawing vacuum from the intake plenum. IT IS NOT. In reality it is a tube that TRANSITS the intake plenum and the other end of it is an attachment for the VSV! He applied vacuum to the "bib" off of the plenum and it "breathed" freely. The tube in the vehicle he was working on DID NOT, it was plugged up solid. He bypassed it with a length of vacuum hose and the system was healed.
This may or may not be something that would happen to other vehicles but I feel it is important enough to check out.
D-
The vehicle in question was a 96 80 series that had a check-engine light triggered by an EGR malfunction. One of our master techs battled the damn thing for several days and numerous visits. He did all of the standard "fixes" that have been posted here ad-infinum.
He was about ready to push the SOB outside and set it on fire when he came to me. "are you driving your Cruiser today?" he asked. Smart a$$ me said, "Am I at work?" He said "let me under the hood. I want to look at something"
Off we go to my vehicle. I opened the hood and he went straight for the vacuum hose that leads from the EGR valve to the intake plenum. On the surface it appears that this hose is drawing vacuum from the intake plenum. IT IS NOT. In reality it is a tube that TRANSITS the intake plenum and the other end of it is an attachment for the VSV! He applied vacuum to the "bib" off of the plenum and it "breathed" freely. The tube in the vehicle he was working on DID NOT, it was plugged up solid. He bypassed it with a length of vacuum hose and the system was healed.
This may or may not be something that would happen to other vehicles but I feel it is important enough to check out.
D-