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The fuel pump pumps the fuel from the fuel tank under pressure up to the fuel rail and injectors.
The coil packs provide a electrical charge (about 40,000 volts) to the spark plugs. It is this charge that makes the spark plug spark.
Either fuel is dripping into cylinder after the ign is turned off or you have carbon built up on the valves or plugs and it it hot and ignites the air fuel mix when you turn ign off pull spark plugs and inspect.
If the ecm didn't fix it, I would have your ignition system checked, could be a bad ICM or a bad coil maybe. If you haven't already checked the spark plugs and spark plug wires. Did you have the ECM programmed for your car?
The ignition coils are built on the spark plug boot. You have to take the plastic cover off thats on the valve covers. The cover usually says V8 four cam on it.
It could be, however the first thing I would check is the Ignition Coil and spark plugs. The spark plugs may not be getting enough power from the ignition coil or they themselves are faulty.
if you refer to spark plugs wet with fuel , 1st check for ign coil have spark , if good, then check engine compression , if under 100 psi , thats the problem.
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94 Lexus 4.0L
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