loud popping sound
#1
loud popping sound
I been having trouble with my car for some weeks now, thinking that its the opti,One of my friends came to test an extra optispark that i have laying around, he unplug the one that is on the car and plug the old one off the car, and plug one of the sparkplugs wires to the optispark and the other end to the sparkplug. He told me to crank the car, then he turn the rotor with the fingers and a big popping sound ,and there was vapor coming out of the intake, what do u think happen to the engine, it still cranks and seems ok. I appreciate any suggestions you can give me on my car.
#2
If I understand you correctly (the spare Opti had the 4-pin signal connector from the wiring harness plugged into it), that actually sounds like what's supposed to happen. When he turned the "off-car" Opti by hand, he produced a signal that made the engine computer think the engine was cranking, so it fired the ignition in order to start the car. It probably just ignited some fuel that was sitting in one of the cylinders with the intake valve open, so what you got was a weak backfire through the intake.
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