Wont run at op temp

PAULC3110

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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?

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

15 Replies

KHLOW2008

MECHANIC
41,814 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

PAULC3110

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14 POSTS

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

KHLOW2008

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41,814 POSTS

Are the injectors pulsing?
Does starting fluid works?

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Friday, September 14th, 2012 AT 6:06 PM

PAULC3110

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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

PAULC3110

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14 POSTS

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

KHLOW2008

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41,814 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

PAULC3110

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14 POSTS

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

PAULC3110

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14 POSTS

I thought this thing ony had a crank sensor.

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Friday, September 14th, 2012 AT 6:36 PM

PAULC3110

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14 POSTS

Any ideas?

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Friday, September 14th, 2012 AT 8:00 PM

PAULC3110

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Hello, dont quit on me now.

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

KHLOW2008

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41,814 POSTS

Sorry for the delay in responding, was away.

You are having problems only when it heats up and that is the time to be checking the ignition sparks, fuel pressure and injector pulse only when the engine fails to start.

Was the ignition coil replaced?

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Saturday, September 15th, 2012 AT 9:06 AM

PAULC3110

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The engine does not actually fail to start it chugs a few times and falls flat on its face. Almost like its way to rich. Any touch of the throttle has the same result. When cold the throttle works fine. Is it possible that the tps is opening up when hot causing a full rich condition? Ignition coils have been ohmd out hot and cold they are good

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Saturday, September 15th, 2012 AT 12:53 PM

KHLOW2008

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" the engine does not actually fail to start it chugs a few times and falls flat on its face. "

I am not sure if I understand what you are trying to say.

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Saturday, September 15th, 2012 AT 6:10 PM

PAULC3110