Question about 1990 Chevrolet Celebrity

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3.1 runs fine then wont start if i turn it off at operating temp. Here's the thing though. in the no start situation it has fuel pressure on the fuel rail and fire at the plugs.THe computer has been replaced.ok so lets recap has a new radiator (no sensor) has a new computer (ecm/pcm) has fuel pressure on the fuel rail, and has spark! could it be timing belt? no because it runs fine no backfire through intake or exahaust. is it the ignition module? no theres spark! is it a fuel problem? no theres fuel pressure on the fuel rail (shoots about a foot in the air, not a dribble). could the injectors be clogged well no because it was running fine untill i turned it off,and what are the odds of all 6 clogging up at same time.so..question does the crankshaft sensor control injectors? but does'nt it also control spark, which i have. question: cam sensor,what does it do and does this motor have one? question could it be intake gaskets leaking? cold they seal engine starts, hot they expand and open leaking when motor is warm and wont allow a restart?

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  • its420_us Aug 26, 2010

    Your issue doesn't sound like it's the intake gaskets, it sounds like "valve seats, or rings". when the engine is hot it loses compression, therefor will not start. I'm very curious to hear what you find on this one, so please let me know. I do wish you the best of luck on it, and I hope it works out for you. Oh, one more thing, I HAVE NEVER ASKED ANYONE FOR A PENNY TO HELP THEM ON FIXYA! I take my personal time, to help people in need.

  • its420_us Aug 26, 2010

    Your issue doesn't sound like leaking gaskets to me. It sounds like the issue is either "valve seats, or rings". When you engine gets hot it loses compression, and therefor will not start. I am very curious to hear what you find out on this one, so please let me know. I take my personal time to try help people in need, and I've never asked for a penny from anyone on fixya.

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HI, ok lets address each issue as your asked 1. Timing belt: since this engine uses a timing chain and it runs fine for the most part its unlikely to be the cause. 2. Ignition module: well the module not only sends the signal for spark timing but it also uses another signal for the fuel injectors. Since these ignition modules are very sensitive to heat the module may fail only when it is hot. So yes it could be the ignition module. 3. A fuel problem: Because you have fuel that sprays a foot high does not mean it has proper pressure. think of it as a garden hose the water flows out the end of the hose normally but when you place your thumb over the hose it squirts harder. You are trying to release the fuel from a much larger fuel rail threw a small shrader valve. Electric fuel pumps are little motors turning at very high rpms. when they get hot after use they draw more amperage and produce less volume and pressure. So yes fuel could be the issue. 3. Injectors clogged: Your right unlikely but you may want to do a resistance check of the injectors while cold then one while hot. You may find even one shorting out after it gets hot and this will shut down the whole bank of them. 4. Crank sensor: the crank sensor sends a pulse to the DIS module the ECM then controls the demand for fuel and timing. These crank sensors are prone to cracking and letting oil wick into the sensor apply heat and it can raise the resistance and make the sensor fail till it cools. So yes the crank sensor can cause this type of no start. 5. Cam sensor: no this model 3.1 did not use a cam sensor. 6. Intake gaskets: this would have to be one very large leak when hot. you could try pouring oil over the intake gasket area while cranking and see if it fires over. The oil is should be heavy and thick enough to seal it for a short time or show where it sucks it in. a few things you over looked are the importance that the temp sensor and TPS sensor play during a hot start. If the ECM thinks that the engine is cold it uses injector pulse like a choke on a carburetor. Good luck on your adventure I hope this has helped.

Posted on Aug 26, 2010

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