Question about 1993 Toyota Corolla

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Motor start but does not run - 1993 Toyota Corolla

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Are you saying that the motor runs until you stop cranking it? or just that it truns over while the starter is engaged but doesn't fire at all?
If it's running while cranking but stalls immediately after you release the key and allow it to go into the "Run" position, then the ballast resistor of the ignition system is most likely bad. The idea is that on older cars with electronic ignition, the starter motor caused such a big voltage drop on the cars electrical system that the ignition coil wasn't provided a high enough voltage for proper spark to occur, so they wired them such that the ignition coil could handle the low voltage which was present during the cranking of the starter, but when you stopped cranking and the engine was running normally, suddenly without the voltage drop of the starter, the voltage would be to high and would damage the ignition circuit. Thus a 'ballast resistor' was added to the ignition circuit and it is only in line when the car is in the "run" position. This allows the ignition system the proper voltage to operate whether cranking or running, but sometimes the ballast resistors go bad, causing the engine to run while cranking but causing an open circuit in the ignition system when placed in the "run" position.
Good Luck.

Posted on Mar 28, 2011

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