Question about 2003 Pontiac Grand Am

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The car has spark and fuel pressure is at 58 psi but the car wont start but can run on starting fluid

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Something with the injectors isn't right. Probally not sending the signal to let the fuel spray into the cylinder. Out of my expertise so I suggest you ask a new question, "Fuel injectors aren't spraying, what would cause this?" Hopefully someone else would be able to help you out.

Posted on Aug 23, 2010

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That engine uses a CPI fuel injection system. It quirks a minimum of 58 psi to start. As little as 1 psi will cause it not to start. Once it is running it requis less fuel pressure do to the poppet injectors being under vacuum. Check fuel pressure with a good gauge. If you see less that 58 psi replace the pump.

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1996 4.3 wont start. Turns over, Spark OK, fuel 55psi


Fuel pressure is a little low. Will it start with a couple shots of carb spray in the throttle body? If it does and continues to run than the fuel pump is not providing enough pressure to to open the mechanical poppet valves on the end of the injectors. minimum fuel pressure is 58 psi. One PSI below spec is enough to make it not start.

Also check to make sure there is spark at each cylinder. just because there is spark at the ignition coil does not mean it is getting the the spark plugs. you may have a bad cap or a rotor that is burned through.

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