1992 Corvette module
Thread Starter
Navigator
Joined: Jul 2014
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1992 Corvette module
I bought a 1992 Corvette Convertible a month ago. After 2 weeks, the engine would die when cold. My mechanic diagnosed the module that controls the left/right oxygen sensors was bad. Sent to GM rebuild program as the module is no longer available. Got it back after 2 weeks, NOT FIXED. Now it has to be sent back and GM says it will be another 2 weeks. They will not put it to the front of the line, even though they did not fix it the first time. Not impressed with their customer service. So now I will be without the car for over a month. Very disappointed. Probably will not buy an older GM car ever again.
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
92's have 2 O2 sensors... one on each down pipe before their respective cat.
However, there is no controller that I am aware of... trying to picture the schematic, but if I am right, the ECU is dead or dying.
I would get the car back and track down an engine controller from a 1992 or 1993 Corvette, or, 1993 Camaro/Firebird with an LT1. Same brain.
Check ebay.
Cardone does reman them, but I don't know about durability.
However, there is no controller that I am aware of... trying to picture the schematic, but if I am right, the ECU is dead or dying.
I would get the car back and track down an engine controller from a 1992 or 1993 Corvette, or, 1993 Camaro/Firebird with an LT1. Same brain.
Check ebay.
Cardone does reman them, but I don't know about durability.
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
You are right. I hadn't noticed that but went out and looked at mine. 2 sensors.
You are also right that there isn't an "O2 Module"...just the ECM. I doubt that the ECM is bad (pretty rare) and even more unlikely that it was bad, then reman'ed, and is still bad. I'd say the root problem is elsewhere. That, plus the mechanics unwillingness to work on the car....I'd find a new mechanic.
You are also right that there isn't an "O2 Module"...just the ECM. I doubt that the ECM is bad (pretty rare) and even more unlikely that it was bad, then reman'ed, and is still bad. I'd say the root problem is elsewhere. That, plus the mechanics unwillingness to work on the car....I'd find a new mechanic.
Melting Slicks
Joined: Jan 2009
Posts: 3,181
Likes: 286
From: Puyallup Washington
Get on your regional Corvette forum and ask who is the Corvette C4 repair person in your area. Get the car to them and have it fixed properly. Your mechanic does not know Corvettes. My 1992 had an O2 sensor problem almost 2 years ago that I diagnosed to the ECM. I had it repaired by Cardone and have had no troubles. You can have the problem diagnosed by someone who knows what is going on or you can have clueless mechanics throw parts and lots of your dollars at it.
Thread Starter
Navigator
Joined: Jul 2014
Posts: 9
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This is THE corvette for the region and he correctly diagnosed the O2 sensor problem. The problem I have is with GM taking two weeks to rebuild the ECM, sending back to me not repaired, and then saying it would take another two weeks; they are unwilling to put it at the head of the line. Their party line is "first come first served" regardless of the fact they didn't do a good repair job.
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Le Mans Master
Joined: Jan 2006
Posts: 5,621
Likes: 206
From: Orlando FL
Get on your regional Corvette forum and ask who is the Corvette C4 repair person in your area. Get the car to them and have it fixed properly. Your mechanic does not know Corvettes. My 1992 had an O2 sensor problem almost 2 years ago that I diagnosed to the ECM. I had it repaired by Cardone and have had no troubles. You can have the problem diagnosed by someone who knows what is going on or you can have clueless mechanics throw parts and lots of your dollars at it.
Lets back up a bit to the first post. Firstly there are many reasons for an engine to die when cold. Could be no spark of a fuel problem. But I don’t believe an O2 related problem would cause this sysptom. The ECM receives the O2 information and voltages. O2 information is not even used in cold engine operation. The engine has to warm up first, go into closed loop and satisfy other operating conditions before the O2 voltages are used for A/F mixture. Even if the O2 operation was bad (which I don’t believe), the software in the ECM would revert to using the sensors for cold operation and the hot operation mileage would be real bad due to the BLEMs and fuel trim not working.
On 93s it is known that ECMs are a problem and do cause lots of strange symptoms to make a engine not run. It could cause no spark, no injector pulses and many other things including susceptible to temperature that could cause intermittent problems.
But the diagnosis in regard to the whole O2 situation just feels like it stinks to me. I would like to know if there was fuel pressure, injector pulses and spark at the time of the problem. These are just basics to point you to the root cause of the problem.