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07-27-2005, 08:41 PM
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#6 |
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Moderator
Join Date: Aug 2000
Location: Milan, OH
Posts: 2,699
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Re: Backfiring question?
Exhaust backfire = exhaust leak. There will always be some amount of unburnt fuel in the exhaust stream. The backfire is caused when you introduce an amount of air sufficient to create secondary combustion. Look for exhaust leaks, particularly downstream of the collectors. This is the point where the dynamic pressure is lower than ambient pressure, causing the exhaust to 'suck in' fresh air. This is the same reason that an exhaust leak will cause an A/F meter in the tailpipe to read lean.
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Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!" |
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