Question about 1997 Saturn SL

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Blown inj fuse - 1997 Saturn SL

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It could be a short in the wiring-a bare wire touching metal, but sometimes an injector will go bad and short out blowing the fuse. Try unplugging all the injectors, then put new fuse in and turn key on. If fuse blows again, it must be a bad wire in the injector circuit. Each injector has a power wire and a ground wire, the power wire probably derives from the engine computer, and the ground wire definitely goes to the computer.
If the fuse didn't blow right away, try connecting one injector at a time (key on). If connecting one injector causes the fuse to blow-that is a shorted injector. It will have to be replaced.
If connecting all injectors did not blow the fuse, try the wiggle test on the wires, with key on. You may cause the fuse to blow by wiggling or moving a section of wire, and that is the likely source of the short. Separate the wires and examine them closely. Look for exposed wire, melted insulation, things like that. Look for where the wiring harnesses may chaff or rub against something, may be stretched or stressed. If you still can't find it, you may need to run continuity or resistance tests on each individual injector wire. For that you would need a multimeter, a good digital volt ohm meter (DVOM) at a reasonable price is a necessity for automotive work.

Posted on Apr 25, 2013


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