backfires on decel.......
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Joined: Apr 2002
Posts: 514
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From: Deer Park, N.Y.
Car: 1983 z-28/SFC/bilsteins/adj.arms
Engine: 355sbc/Demon650dp/hedmanheaders/
Transmission: t-5, alum DS
Axle/Gears: 3.42 torsen posi, baer discs
backfires on decel.......
i changed the PV on my holley 3310 from a 6.5 to a 9.5 and now the car backfires whenever the car decellerates. i think the PV is opening too soon now and the fuel mix too rich now....motor pulls 20" of vacuum at idle and i'm running with a t-5 and 3.73 rears....i'm thinking i should go back to the 6.5PV....
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iTrader: (5)
Joined: Jan 2002
Posts: 13,622
Likes: 5
From: Orland Park, IL
Car: 1984 Z28
Engine: SLOW carbed ls
Transmission: TH400 with brake, 8" PTC converter
Axle/Gears: moser 9" 4.11
Re: backfires on decel.......
backfires out the carb or out the exhaust?
Thread Starter
Senior Member
Joined: Apr 2002
Posts: 514
Likes: 0
From: Deer Park, N.Y.
Car: 1983 z-28/SFC/bilsteins/adj.arms
Engine: 355sbc/Demon650dp/hedmanheaders/
Transmission: t-5, alum DS
Axle/Gears: 3.42 torsen posi, baer discs
Re: backfires on decel.......
only out the tail pipe.......behaves like a road race car..just pops and gurgles as i enter a corner then accelerates fine......is it timing? or do i have that much unburned fuel in the exhaust?
Supreme Member
iTrader: (5)
Joined: Jan 2002
Posts: 13,622
Likes: 5
From: Orland Park, IL
Car: 1984 Z28
Engine: SLOW carbed ls
Transmission: TH400 with brake, 8" PTC converter
Axle/Gears: moser 9" 4.11
Re: backfires on decel.......
mine pops at the end of the 1/4 mile as well....just the nature of the beast
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tyeo098
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