Question about 2002 Pontiac Grand Am

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Car won't start--stopped running while driving appears to be fuel pressure did not overheat--trac off light followed by the service engine soon light came on while driving and within a couple miles the car shut off and wouldn't restart cranks well and tries to turn over but will not start battery is new (within the year) and we have replaced crank sensors, bcm, and ignition system all within 18mo as we were having passlock issues--we thought we had problems solved with this car then this

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  • Pontiac Master
  • 2,019 Answers

Check the fuel pressure.
If no pressure, then check for power at the pump when cranking. If not, it is the fuel pump relay. You an pull it and put a jumper across the secondary leads to get it to run.

Posted on Apr 28, 2010

  • joeygibbons3 Sep 24, 2010

    please explain the jumper and secondary leads. i have the same problem

  • Kirk Augustin
    Kirk Augustin Sep 24, 2010

    Relays almost always have 4 leads. The 2 primary are power and ground to turn on the magnet that energizes the relay. Then the magnet pulls a switch closed to the 2 secondary wires that complete the circuit to the output.
    The primary are from the ignition switch and ground, but can go through an ECM or a safety inertial cut out, and tends to be a weak current to as to make the ignition switch last longer.
    The secondary tend to be heavier wires that can hold more current, because the fuel pump usually uses a lot of current, and is a power in, and out goes to the pump.
    So you don't really need the primary or relay at all, and can just short the 2 secondaries together. Look in the side of the relay, and the diagram will show with prongs are secondary because it looks sort of how they show a door hinged in a blueprint. That will show you which slots to shunt together with a piece of wire or paperclip.

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You will have to pinpoint what the engine is missing Spark / Fuel / Compression

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