Question about 1990 Pontiac Sunbird

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Sunbird died going down road and wont start. I am getting no spark will turn over but no fuel coming out of injector. would it be my ignition relay? I tried to dump gas down carb and wont fire. tried changing ignition coil, did not help? ther is 12 volts to the coil but no output on the coil or on the plugs?

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If you are getting no fuel it would more than likely bee the fuelpump

Posted on Jul 11, 2010

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The engine can stall for a number of reasons. For a engine to run it requires air, fuel, compression, and spark at the proper time. I doubt air is the problem. The fuel pump may be cutting out (bad pump, bad relay, bad pump wiring inside the tank (my 93 3.0 Ranger had the last issue). The engine stall could be a lack of fire to the plugs. A bad (cracked) coil, ignition module problem, EFI computer or wiring problem, or maybe an ignition switch problem. The starting system is somewhat isolated and pretty much separate from the ignition system in general. This makes me suspicious of your ignition switch.

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1 Answer

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The power supplied to the fuel pump, ignition coil, fuel injectors and parts of the power module is controlled by the logic module through the Automatic Shutdown Relay (ASD):
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Failure of the automatic shutdown relay is often shown as inexplicable stalling or refusal to start. The ASD can be triggered by a broken wire or short in another place, e.g. the fuel pump.  Hope this helps, and did you try to retrieve any DTC codes?? Be glad to help friend.

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