89 won't run
Thread Starter
Burning Brakes
Joined: Dec 2012
Posts: 788
Likes: 160
From: Rio Rico, AZ
So my Vette is back from the shop running quite nicely and my pocket book is $480 lighter. Aklim, you were right I shouldn't trust my nose. Instead of a lean burn it was very rich (although I and a friend didn't smell unburnt fuel). I have a really bad sense of smell. And PatternDayTrader, it was not the fuel pump relay. 
What it turned out to be was the MAF. What I'm confused about is being it was a bad MAF, shouldn't the car thrown a code for that? The mechanic checked for codes right off and found nothing. So had I. He put on a new cap/rotor too. The old ones were not terrible when checked but I said go ahead.
Anyway, it runs nice and strong once again.
Went
What it turned out to be was the MAF. What I'm confused about is being it was a bad MAF, shouldn't the car thrown a code for that? The mechanic checked for codes right off and found nothing. So had I. He put on a new cap/rotor too. The old ones were not terrible when checked but I said go ahead. Anyway, it runs nice and strong once again.
Went
Last edited by Went; Feb 8, 2018 at 11:05 AM.
Race Director
Joined: Oct 2008
Posts: 17,982
Likes: 1,074
From: Lansing MI
So my Vette is back from the shop running quite nicely and my pocket book is $480 lighter. Aklim, you were right I shouldn't trust my nose. Instead of a lean burn it was very rich (although I and a friend didn't smell unburnt fuel). I have a really bad sense of smell. And PatternDayTrader, it was not the fuel pump relay. What it turned out to be was the MAF. What I'm confused about is being it was a bad MAF, shouldn't the car thrown a code for that? The mechanic checked for codes right off and found nothing. So had I. He put on a new cap/rotor too. The old ones were not terrible when checked but but I said go ahead.
Anyway, it runs nice and strong once again.
Went
What it turned out to be was the MAF. What I'm confused about is being it was a bad MAF, shouldn't the car thrown a code for that? The mechanic checked for codes right off and found nothing. So had I. He put on a new cap/rotor too. The old ones were not terrible when checked but but I said go ahead.Anyway, it runs nice and strong once again.
Went
Thread Starter
Burning Brakes
Joined: Dec 2012
Posts: 788
Likes: 160
From: Rio Rico, AZ
So what's new now? A code 36 set today. I see it's the MAF burn off relay error. Poking around I found a tiny broken vacuum line and fixed that. Disconnected the neg. battery cable to reset things. Will see if it comes back tomorrow. Maybe need to replace the two MAF relays??
Went
Went
Team Owner
Joined: Jul 2004
Posts: 28,471
Likes: 3,290
From: Hartford WI
So what's new now? A code 36 set today. I see it's the MAF burn off relay error. Poking around I found a tiny broken vacuum line and fixed that. Disconnected the neg. battery cable to reset things. Will see if it comes back tomorrow. Maybe need to replace the two MAF relays??
Went
Went
I don't think you are on the right track. Code 36 is the burn off relay so I'm not sure what it has to do with the vacuum line. What does it go from and to?
Thread Starter
Burning Brakes
Joined: Dec 2012
Posts: 788
Likes: 160
From: Rio Rico, AZ
https://www.corvetteforum.com/forums...ay-issues.html
I don't think you are on the right track. Code 36 is the burn off relay so I'm not sure what it has to do with the vacuum line. What does it go from and to?
I don't think you are on the right track. Code 36 is the burn off relay so I'm not sure what it has to do with the vacuum line. What does it go from and to?
Went
Thread Starter
Burning Brakes
Joined: Dec 2012
Posts: 788
Likes: 160
From: Rio Rico, AZ
So I had a new MAF put on and within a couple days had a code 36 set. So I replaced both the MAF relays. All seemed well then a code 33 was set and it ran terrible. Took it back to the shop and they installed another new MAF (Bosch/Echlin brand) and it runs great once again. I wonder why one MAF will not work and another will? This is something I've read in the forum many times. People will go through two or three before one works correctly. Is this just an issue of poor quality manufacturing or deviation in specification of an electronic component in the MAF? Could capacitors, resistors and the like be to the high or low side of their tolerance range and cause a signal to fall outside the settings in the ECM? Just curious what the root of the problem might be.
Went
Went
Team Owner
Joined: Jul 2004
Posts: 28,471
Likes: 3,290
From: Hartford WI
So I had a new MAF put on and within a couple days had a code 36 set. So I replaced both the MAF relays. All seemed well then a code 33 was set and it ran terrible. Took it back to the shop and they installed another new MAF (Bosch/Echlin brand) and it runs great once again. I wonder why one MAF will not work and another will? This is something I've read in the forum many times. People will go through two or three before one works correctly. Is this just an issue of poor quality manufacturing or deviation in specification of an electronic component in the MAF? Could capacitors, resistors and the like be to the high or low side of their tolerance range and cause a signal to fall outside the settings in the ECM? Just curious what the root of the problem might be.
Went
Went
Thread Starter
Burning Brakes
Joined: Dec 2012
Posts: 788
Likes: 160
From: Rio Rico, AZ
Went
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Team Owner
Joined: Jul 2004
Posts: 28,471
Likes: 3,290
From: Hartford WI
Believe so, Bosch made for Echlin. I agree with the above. But having worked in manufacturing and process control for many years it just made me wonder what causes such a high failure rate on the same new parts within a brand name. What factors might be at play. Just curious...
Went
Went
Signed
The Cynic