WONT RUN AT OP TEMP

  • Tiny
  • paulc3110
  • 1988 Oldsmobile Ciera
  • 65,432 miles

1988 cutless cierra 2.8 runs fine up to operating temp of 188 then falls flat on its face. Will not restart till cooled down completly. I have changed just about everyelectrical part including fuel pump filter and reg. I have rang out entire engine harness no broken wires fuel pressure fine I dont know what to do next anyone got a clue?

Friday, September 14th, 2012 AT 5:49 PM

15 Answers

  • Tiny
  • KHLow2008
  • Expert
  • 41,976 posts

Are there any trouble codes?

When it failed to restart, what is missing? Ignition sparks, fuel injectors not pulsing, fuel pump not working?

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Friday, September 14th, 2012 AT 5:55 PM
  • Tiny
  • paulc3110
  • Member

No codes have fuel pressure and spark. This is a good one. I do question the fuel volume though. But I cant figure out what stops the fuel pressure is good

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Friday, September 14th, 2012 AT 6:00 PM
  • Tiny
  • KHLow2008
  • Expert
  • 41,976 posts

Are the injectors pulsing?
Does starting fluid works?

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Friday, September 14th, 2012 AT 6:06 PM
  • Tiny
  • paulc3110
  • Member

Yes starting fluid will keep it running when in this state. I will go recheck pulse @ injectors.

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Friday, September 14th, 2012 AT 6:19 PM
  • Tiny
  • paulc3110
  • Member

Leting it warm up, Its amazing how good it runs when cold like brand new. Will let you know bout pulse anly take a few with no thermistat in.

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Friday, September 14th, 2012 AT 6:23 PM
  • Tiny
  • KHLow2008
  • Expert
  • 41,976 posts

If starting fluid works and you have fuel pressure, the fuel injectors are not pulsing.

It could be the PCM or cam sensor has a fault.

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Friday, September 14th, 2012 AT 6:27 PM
  • Tiny
  • paulc3110
  • Member

Nope got pulse and pressure just warmed it up now it is in the not run state. Or should I say starts makes a few revolutions but rough ones almost like its way to fat.

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Friday, September 14th, 2012 AT 6:35 PM
  • Tiny
  • paulc3110
  • Member

I thought this thing ony had a crank sensor.

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Friday, September 14th, 2012 AT 6:36 PM
  • Tiny
  • paulc3110
  • Member

Any ideas?

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Friday, September 14th, 2012 AT 8:00 PM
  • Tiny
  • paulc3110
  • Member

Hello, dont quit on me now.

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Friday, September 14th, 2012 AT 8:37 PM

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