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10-30-2015
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#1 |
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Join Date: Aug 2015
Location: Crestview
Posts: 7
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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?
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10-30-2015
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#2 |
 Join Date: Apr 2004
Location: Atlanta, GA
Posts: 2,169
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Re: loud backfire
Does it have headers? or an aftermarket e-prom?
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Steve 1990 Steel Blue/Black #2355 1990 Red/Red #1473 1991 Quasar /Black #118 Sold 1991 Turquoise/Black #766 Parted Out 1993 Yellow/White #179 Sold 1990 Black/Gray #1361 Headers/4:10s Sold |
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10-30-2015
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#3 |
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Join Date: Aug 2015
Location: Crestview
Posts: 7
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Re: loud backfire
Might have a prom, skip shift is eliminated
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10-30-2015
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#4 |
 
Join Date: Jun 2005
Location: pittsburgh
Posts: 4,624
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Re: loud backfire
Probably needs a tune
__________________
It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B" |
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10-30-2015
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#5 |
 Join Date: Feb 2014
Location: AZ
Posts: 857
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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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