Question about Saturn SL
New plugs wires ,believe faulty injector. idle very high,code po507, maybe bad iac motor.can you help?
A faulty IAC would cause a random misfire rather than a misfire in a specific cylinder, as would an intake air leak, both of which would cause a high idle amongst other things.
Run the engine until its good and hot, disconnect the injector harness plug so the injectors are disabled, remove all the spark plugs, disable the ignition by unplugging the wiring connector(s) from the coil pack(s), and then carry out another compression test on al the cylinders.
If the compressions are now all relatively the same then you very highly likely have a faulty injector in cylinder 3.
Very best regards
Posted on Jun 28, 2008
Were the plugs you took out all the same? if not I think you're right.
If the idle is smooth (ish) fuel is getting burnt. But with a faulty injector - too much in that cylinder. You may be able to pull it and test it by cranking over without power to the plugs, but this will just show it working. It must work between limits to be effective - which can only be done on a testing bench.
You could try refitting a 2nd hand one - or a set to see any difference, or get them tested and reconditioned to be sure.
Posted on Jun 28, 2008
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Posted on Jan 02, 2017
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