BACKFIRE PROBLEM!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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Junior Member
Joined: Feb 2007
Posts: 79
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From: Montreal, Canada
Car: 1985 Z28
Transmission: T5
BACKFIRE PROBLEM!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Hey everybody...
I've been having a backfire problem lately. I have an 1985 Z28, LG4 305, Vortec heads, and a 600CFM Edelbrock carburator which is brand new. Since I've changed the carb, it runs good, it accelerates great, and the idol is smooth. But, if during accelerating, I rev it until 4000rpm (as an example), and immidiately let go of the gas to let the car deaccelerate by itself...the car backfires like crazy.
Is this a sign that the engine is running rich??? If so, what size of rods and jets is adequate for my application????
Thank you for the cooperation!!!!!!!!!!
Jon
I've been having a backfire problem lately. I have an 1985 Z28, LG4 305, Vortec heads, and a 600CFM Edelbrock carburator which is brand new. Since I've changed the carb, it runs good, it accelerates great, and the idol is smooth. But, if during accelerating, I rev it until 4000rpm (as an example), and immidiately let go of the gas to let the car deaccelerate by itself...the car backfires like crazy.
Is this a sign that the engine is running rich??? If so, what size of rods and jets is adequate for my application????
Thank you for the cooperation!!!!!!!!!!
Jon
Joined: Mar 2000
Posts: 43,187
Likes: 45
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
It's a sign your idle mixture is too rich.
When the throttle is closed, air and fuel are being metered by the idle system, not the rods & jets.
When the throttle is closed, air and fuel are being metered by the idle system, not the rods & jets.
Thread Starter
Junior Member
Joined: Feb 2007
Posts: 79
Likes: 0
From: Montreal, Canada
Car: 1985 Z28
Transmission: T5
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