1990 Oldsmobile Delta 88 engine stalls or won't restart at

Tiny
BB650
  • MEMBER
  • 1990 OLDSMOBILE DELTA 88
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 130,000 MILES
When cold the engine starts and runs very well untill it reaches about 180 deg.F, up to this point I can turn the ignition off stopping the engine and then restart as often as I like. After reaching about 180 or operating temp. The engine may stop abruptly at any time, or if I turn the ignition off to stop the engine it will not restart. At this point I have determined there is no spark coming from the ignition coil bank to the spark plugs. After the engine cools off completely it will restart and run sweet as can be untill it reaches operating temp. And looses spark again or is turned off, at which point it will not restart because there will be no spark. I have replaced the ECM with a spare one I know to be good, but the result is still the same. I hope you can help. Thank you, Keith (bb650)
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Monday, October 12th, 2009 AT 7:13 PM

8 Replies

Tiny
BIG_JAY
  • MEMBER
Does this car have the 3 coils with 2 ires per coil on it?
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Monday, October 12th, 2009 AT 7:27 PM
Tiny
BB650
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Yes there are 3 coils each coil feeds two spark plugs.
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Monday, October 12th, 2009 AT 7:39 PM
Tiny
BIG_JAY
  • MEMBER
The problem sounds like you have a bad modual. That is the black thing under the coils that the coils bolt to. I would moniter fuel pressure to make sure that isnt the problem first but it is common for a weak ignition modual to cut off when it is hot.
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Monday, October 12th, 2009 AT 7:46 PM
Tiny
BB650
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Do you think the problem could be the crankshaft monitor? I am reluctant to buy a coil module unless I am very sure that it will fix the problem, I priced one out at $425.00. That is a little too much to spend unless I am sure. Thanks
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Saturday, October 17th, 2009 AT 8:34 AM
Tiny
BIG_JAY
  • MEMBER
If u price it out on the Internet it will b cheaper. The only thing I see wrong with it being a crank sensor is that it only happenes when hot. U will need to drive it with a scanner hooked up to it until it dies on you to b able to see if u are getting a crank signal by watching the data stream. Moduals can get hot n over heat crank sensors usually don't. To b 100% sure u will need a scanner with a data stream.
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Saturday, October 17th, 2009 AT 8:39 AM
Tiny
BB650
  • MEMBER
I bought the ignition modual online and after instalation there is no difference. Still looses spark at operating temp. I have just ordered the crankshaft position sensor but I am wanting to know if there are any other parts that might cause this problem? I seem to be grasping at straws. I do not have access to the fancy gismo with the data stream monitor as you suggested. I am soon going to be into it for more than the car is worth. Thanks
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Thursday, November 5th, 2009 AT 1:27 AM
Tiny
BIRCHMANDUDE
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Saturday, November 21st, 2009 AT 9:30 AM
Tiny
BB650
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Yes the cranckshaft position sensor was the problem. After installing it the engine runs fine now. It is worth a try, and it will not break the bank account.
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Sunday, November 22nd, 2009 AT 11:06 AM

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