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Old 16 Aug 2007, 04:12 am
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Default I have a custom exhaust why does my car back fire so much when i shift gears??

I have a custom exhaust why does my car back fire so much when i shift gears??
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Old 16 Aug 2007, 04:15 am
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that backfiring has nothing to do with you dual exhaust. it could be a few things, one being a vacuum problem.
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Old 16 Aug 2007, 04:16 am
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the other being valve train issues ( valve springs, lifters, valves, ETC)
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Old 16 Aug 2007, 04:17 am
leo leo is offline
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Did you get the muffer right,most car need a certain amount of back pressure for smooth operation
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Old 16 Aug 2007, 04:19 am
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It sounds like you either need your carbs re-jetted, or your computer reprogrammed if it's injected.
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Old 16 Aug 2007, 04:21 am
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When was the last time you did a major tune-up? that could be your problem. and also check your timing. It's not the exhaust.
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Old 16 Aug 2007, 04:21 am
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its not your custom exhaust tune your engine especially your coolant system
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Old 16 Aug 2007, 04:21 am
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the auto is not getting proper back pressure needs valve and carb adjustment too new pipes,can cause damage
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Old 16 Aug 2007, 04:22 am
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I had the same thing happen on a dodge pick-up ran stainless steel duals and free flow mufflers at first .And had to put on resonators and an equalizer pipe to equal the pressure(making it an h-pipe exhaust).for another $75.00 I could have bought an off road exhaust at the speed shop .
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Old 16 Aug 2007, 04:22 am
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You still have your cats? if not that could cause backfiring
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