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What causes intake backfires?

Old Sep 11, 2000 | 07:49 PM
  #1  
Mark305TBI's Avatar
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Joined: Jul 1999
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From: Huntsville, AL
Car: '00 Chevrolet Corvette
Engine: LS1
Transmission: 4L60E
Axle/Gears: 2.73
What causes intake backfires?

Why, when the air/fuel mix becomes too lean, does it explode in the intake and out the carb/TBI? I'm having this problem and I think that knowledge of the physics behind phonemon would aid in my diagnosis of the problem.

-Mark W.
<A HREF="http://www.angelfire.com/al3/thegreycar">'88 SC Camaro w/ 305 TBI</A>
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Old Sep 11, 2000 | 08:10 PM
  #2  
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From: Homestead, Fla
yup, a lean condition usually. a lean mixture is much easier to ignite than a normal or rich one. If it's lean enough it'll ignite on the back of a hot valve or something, and blowup through the intake.

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