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Old 12-03-2008, 11:40 AM   #17 (permalink)
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Originally Posted by lunarhighway View Post
i'm not sure im with you here, i mean i can see it's not a ideal situation where the sparks keep fireing when there's no fuel going to the engine as they might be cooled by the fuel.
but how exactly whould leaving the iginion on be bad?
I think it would be okay. Some vehicles require special handholding to run with a sparkplug removed (i.e. the spark plug needs to be grounded to the body or whatever), but I don't think that matters if everything is installed and firing as normal. The only issue I could see is that the fuel injectors and fuel rail are cooled by the fuel, so you could get some overheating, but for the two or three minutes, max, that you would have no fuel flowing, I imagine it would be okay.

I wouldn't switch off the ECU if possible; I doubt it's designed to handle being switched on and off dozens of times a day, and it's one of the most expensive bits in the car. Somebody mentioned interrupting the camshaft sensor in OBD2 cars; if yours is so equipped, you might try that. That interrupts both fuel and spark.

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