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- - loud backfire (http://zr1.net/forum/showthread.php?t=25756)

Snaps

10-30-2015 02:06 PM

loud backfire

1990, previous owner installed aftermarket mufflers. When i turn the key to full and lay into it, between shifts or when i let off i get a very loud somtimes violent sounding backfire. Also usually my dipstick is a quarter of an inch popped out. Im thinking crankcase pressures? Should i be worried?

We Gone

10-30-2015 03:07 PM

Re: loud backfire

Does it have headers? or an aftermarket e-prom?

Snaps

10-30-2015 03:57 PM

Re: loud backfire

Might have a prom, skip shift is eliminated

Kevin

10-30-2015 05:29 PM

Re: loud backfire

Probably needs a tune

KILLSHOTS

10-30-2015 07:23 PM

Re: loud backfire

There's an anti-backfire feature (forgot the actual technical term) that Marc enables on his PROMs when you install headers. When I had mine installed, I sent him my PROM for an update and when I got it back and installed it, it was backfiring so hard I thought it would blow the exhaust off. I contacted Marc and he checked his records and noticed that he had forgotten to enable this feature and he took care of it right away.

Short answer: contact Marc and order a PROM with anti-backfire enabled. Good luck.

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