Question about 2000 Chevrolet 3500

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It will only fire with starting fluid. Either cold or hot. Runs fine after, but will not re start on own. We replaced cam sensor, crank sensor, temp sensor, pressure regulator, and distributor cap.

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  • demerson0428 Jul 27, 2009

    That was the first thing I did. Thanks.



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Not to sound like a ******* but did you change the fuel filter?Also when you turn the key to the on "not crank" possion you should hear the pump primming the fuel system.If you do not hear the pump go under and feel the pump.You can also remove the cap and listen.

Posted on Jul 26, 2009


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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...

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.

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