1992 Oldsmobile 88 Olds 88 misses and dies when warm

Tiny
JINKIES
  • MEMBER
  • 1992 OLDSMOBILE 88
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 146,000 MILES
I got an 1992 olds eighty eight royale from a friend of mine. It would run but then after driving it somewhere and then letting it sit, it would not start for them. They had taken it to a shop. The shop could not duplicate the problem but replaced the crankshaft sensor hoping that would fix it. The problem continued. I get the car and I put a new ignition module in and it works fine. For a week, then it started missing when idling and die. I changed the plugs, wires, tried another ignition control module, a new computer. The problem persist. It runs fine when cold, after it warms up it won't idle and misses badly. If I am on the highway it is ok. My thinking is that maybe there is a short to crankshaft sensor. I'm not sure what to do. Any help is appreciated.
Tuesday, October 12th, 2010 AT 2:28 PM

5 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Maybe a problem with coolant temp sensor? Any applicable mil codes?
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Tuesday, October 12th, 2010 AT 2:33 PM
Tiny
JINKIES
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Could the temp sensor make the car misfire? Codes are 12 and 41. 12 is normal and 41 is the cam sensor. I was told this won't cause the problems I am having. Do you not think it is a short. It is just so strange that it will run perfect and then when it is hot misfire. Very frustrating. Thanks for your help
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Tuesday, October 12th, 2010 AT 2:41 PM
Tiny
JDL
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When you get into no code diagnostics, the list of possibilities is as long as your arm. The cam and crank sensor share ref voltage and ground, I'd check them both.


https://www.2carpros.com/forum/automotive_pictures/170934_92_olds_88_1_1.jpg



https://www.2carpros.com/forum/automotive_pictures/170934_92_olds_88_2_1.jpg

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Tuesday, October 12th, 2010 AT 3:08 PM
Tiny
JINKIES
  • MEMBER
  • 3 POSTS
Do you know where the ground is? I have tried following the wires from the crank sensor. There is so much crap in the way. I don't want to have to take all off to find out where a wire goes. If I do that I might as well change the wiring harness. I'm thinking about doing just that. Such a pain
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Tuesday, October 12th, 2010 AT 3:19 PM
Tiny
JDL
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My info shows ref voltage and ground both come from the ignition module, for cam and crank sensor.
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Tuesday, October 12th, 2010 AT 3:28 PM

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