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Popping sound when car is running

post #1 of 2
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Just installed xm in my jeep. Sounds great when the key is on accessory but as soon as I actually start the engine I get a kind of rythmic popping sound. Happens whether the ant. is inside or outside. What can I do?
post #2 of 2

Re: Popping sound when car is running

You might have a bad (or loose) spark plug wire. Might not be the problem but it's a good place to start.
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