yeah...I was duly impressed with Chevy's engineered solution.
Run Lean Condition
Thread Starter
Advanced
Joined: Sep 2004
Posts: 92
Likes: 2
From: VA
Run Lean Condition
My 2008 Coupe NPP experienced a "check engine" light which was diagnosed by the dealer as a "run lean" condition. Unfortunately, the dealer was unable to track down the source as their internet was down (couldn't access the troubleshooting sequence) and I need to take it back in.
Dealer said there was a possible vaccuum leak somewhere on the intake side or that a reprogramming might be necessary for the mass flow sensor.
Has this condition happened with anyone else?
Dealer said there was a possible vaccuum leak somewhere on the intake side or that a reprogramming might be necessary for the mass flow sensor.
Has this condition happened with anyone else?
Melting Slicks
Joined: Jul 2008
Posts: 2,014
Likes: 2
St. Jude Donor '09-'10
I hope the dealer explained (and in case you didnt know) this is a very dangerous situation possibly causing a misfire.
My 2008 Coupe NPP experienced a "check engine" light which was diagnosed by the dealer as a "run lean" condition. Unfortunately, the dealer was unable to track down the source as their internet was down (couldn't access the troubleshooting sequence) and I need to take it back in.
Dealer said there was a possible vaccuum leak somewhere on the intake side or that a reprogramming might be necessary for the mass flow sensor.
Has this condition happened with anyone else?
Dealer said there was a possible vaccuum leak somewhere on the intake side or that a reprogramming might be necessary for the mass flow sensor.
Has this condition happened with anyone else?
Thread Starter
Advanced
Joined: Sep 2004
Posts: 92
Likes: 2
From: VA
Thanks. I'm not driving it.
Ironically, when I took it in to the dealer, the check engine light went out momentarily, but came back on which leads all concerned to think it might be a vaccuum leak due to a bad connection/hose. We'll see.
Ironically, when I took it in to the dealer, the check engine light went out momentarily, but came back on which leads all concerned to think it might be a vaccuum leak due to a bad connection/hose. We'll see.
Racer
Joined: Oct 2008
Posts: 265
Likes: 1
I had this same problem on my new '08.
Check engine light came on. Dealer reset it. Came on again.
They researched and found a TSB on '07s that indicated some holes on the header panel can cause turbulence in the intake track that the engine mistakes for a lean condition. There are four holes on eithr side of the air intake. They taped over the holes.
No more check engine light.
Check engine light came on. Dealer reset it. Came on again.
They researched and found a TSB on '07s that indicated some holes on the header panel can cause turbulence in the intake track that the engine mistakes for a lean condition. There are four holes on eithr side of the air intake. They taped over the holes.
No more check engine light.
Thread Starter
Advanced
Joined: Sep 2004
Posts: 92
Likes: 2
From: VA
As a conclusion, I hope, today the dealer fixed the car. He uploaded the TSB for the "run lean" condition which didn't correct the problem. Then he switched out the mass flow sensor which appears to have done the trick. It looks like the left engine bank was running slightly lean.
Racer
Joined: Oct 2008
Posts: 265
Likes: 1
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From: Monument CO
I had this same problem on my new '08.
Check engine light came on. Dealer reset it. Came on again.
They researched and found a TSB on '07s that indicated some holes on the header panel can cause turbulence in the intake track that the engine mistakes for a lean condition. There are four holes on eithr side of the air intake. They taped over the holes.
No more check engine light.
Check engine light came on. Dealer reset it. Came on again.
They researched and found a TSB on '07s that indicated some holes on the header panel can cause turbulence in the intake track that the engine mistakes for a lean condition. There are four holes on eithr side of the air intake. They taped over the holes.
No more check engine light.
Race Director
Joined: Oct 2004
Posts: 10,089
Likes: 14
My 2008 Coupe NPP experienced a "check engine" light which was diagnosed by the dealer as a "run lean" condition. Unfortunately, the dealer was unable to track down the source as their internet was down (couldn't access the troubleshooting sequence) and I need to take it back in.
Dealer said there was a possible vaccuum leak somewhere on the intake side or that a reprogramming might be necessary for the mass flow sensor.
Has this condition happened with anyone else?
Dealer said there was a possible vaccuum leak somewhere on the intake side or that a reprogramming might be necessary for the mass flow sensor.
Has this condition happened with anyone else?
Yet they did seem to know a vacuum leak can cause this, though they apparently didn't look for a vacuum leak. The other things that can cause this are low fuel pressure (easily checked), or a faulty mass flow sensor (easily replaced). No internet connection required unless the mechanic has a hot role playing game he doesn't want to miss.
