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1992 Oldsmobile Ciera code 42?

Tiny
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  • 1992 OLDSMOBILE CIERA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 111,000 MILES
My mom's 92 ciera with the 3.3 just dies while driving, runs great then dies. Won't start till it cools off again, then dies once it's warm again. Ran codes and it came up with 42 bypass or est circuit. Plugs and wires are only a year old. What could cause this?
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Saturday, October 11th, 2008 AT 6:16 PM

12 Replies

Tiny
JAMES W.
  • MECHANIC
  • 2,394 POSTS
The EST or Ign. Control modules of this ara are known for "heat break down". This sounds like the culprit for your problem. It should be located on the passenger side front, or left side of the motor next to the coil pack. Hope this helps you.
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Saturday, October 11th, 2008 AT 9:13 PM
Tiny
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Thanks. I'll give it a shot.
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Saturday, October 11th, 2008 AT 11:54 PM
Tiny
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Wasn't the problem. Tested good at one parts store and bad at another. So I replaced it and bad it still died when it warm. Any other ideas? I was thinking crank sensor, but there is a seperate code for that. Some more help would be greatly appreciated.
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Sunday, October 12th, 2008 AT 4:04 PM
Tiny
JAMES W.
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BUMMER. Let me do a little more research and I'll get back to you yet tonight. I should have asked this before. Are you sure it is spark you're losing and not fuel? Let me know ASAP so I know I'm looking in the right direction.
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Sunday, October 12th, 2008 AT 8:44 PM
Tiny
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Ya I lose spark. I checked volts for the module pig tail while the problem was occuring. Here are the results pink-12v, dk blu/wht 0, wht/blk 0, gry/red 0, lt blu/wht 0, wht 0, blk/red 10.1, purp/wht.1, tan/blk 0, wht.1. Not sure if I should've checked ohms instead. Hope this helps. Thanks for your help.
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Monday, October 13th, 2008 AT 7:08 PM
Tiny
JAMES W.
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When you lose spark, do you also lose the pulse to the injectors? If yes, the crank shaft position sensor
(located on the RT side of engine block) controls both spark and injector pulse. You can check injector pulse with a test light. A digital meter will not respond fast enough to show a pulse. Do you have, or have access to, a fax machine?
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Tuesday, October 14th, 2008 AT 10:13 AM
Tiny
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Probley at work, I'll have to ask. I don't have test light, best I have is 2 wires and a turn signal bulb. Will that work?
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Tuesday, October 14th, 2008 AT 6:17 PM
Tiny
JAMES W.
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You can try it. It may have have too much impedence to actually flash but, you might get a small glow. They normally use a unit called a "noid light" which is a small zenon bulb, like those used in timing lights, that plugs into the injector lead. They flash like a timing light.
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Tuesday, October 14th, 2008 AT 7:29 PM
Tiny
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Ok I'll see if I can one. Do I need special tools to change the crank sensor? The book said I needed to adjust the o2 sensor and check the interrupter rings. Can I do it without the tool.
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Wednesday, October 15th, 2008 AT 8:46 PM
Tiny
JAMES W.
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If the car is in the "stalled condition" and you also have no fuel injector pulse, then I would change the CPS. I takes no special tools and you should have nothing to adjust. The computer will take care of that.
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Wednesday, October 15th, 2008 AT 9:09 PM
Tiny
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Cool thank you. I'll change it and let you know.
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Saturday, October 18th, 2008 AT 2:46 PM
Tiny
JAMES W.
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Holding for a reply.
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Tuesday, October 28th, 2008 AT 2:21 AM

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