backfiring when decellerating
05-02-2007, 02:15 AM
#1
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Join Date: Apr 2007
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backfiring when decellerating
i just got a 88 mustang gt that had sat for 2 years. i have ran 4 tanks of premium through it. when i let off the gas or roll out of it, and it is slowing down it pops really bad not as bad as a big backfire but its close. i have timed the engine in too. do i need ot do plugs and a fuel filter?
Mason
Mason
05-02-2007, 02:45 AM
#2
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Join Date: Oct 2006
Posts: 2,424
RE: backfiring when decellerating
u should do that anyways but alot of cars do this if the cats are gutted or exaust has been changed its un burnt fuel in the pipes igniting cus the car is moving faster than the engine wants to and raw fuel is being sent out the exaust...usually, see whats up with the exaust... is it still stock???
ORIGINAL: masonweitzel
i just got a 88 mustang gt that had sat for 2 years. i have ran 4 tanks of premium through it. when i let off the gas or roll out of it, and it is slowing down it pops really bad not as bad as a big backfire but its close. i have timed the engine in too. do i need ot do plugs and a fuel filter?
Mason
i just got a 88 mustang gt that had sat for 2 years. i have ran 4 tanks of premium through it. when i let off the gas or roll out of it, and it is slowing down it pops really bad not as bad as a big backfire but its close. i have timed the engine in too. do i need ot do plugs and a fuel filter?
Mason
05-02-2007, 11:16 PM
#3
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Join Date: Apr 2007
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Posts: 24
RE: backfiring when decellerating
its a flowmaster mufflers with a hpipe, i don't knwo what brand but it is catless. it idles rough like from 1000 to 700, i have reset the iac and it is fine for a while then a few mins later it goes back to doing it. im gonna do plugs tommorow gap is what. 054?
05-04-2007, 11:45 PM
#8
4th Gear Member
Join Date: Nov 2006
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Posts: 1,016
RE: backfiring when decellerating
ORIGINAL: masonweitzel
ya its hooked up.
ya its hooked up.
Check the plastic vaccum tubes that go to the smog check valve and diverter valves. If they are broken or not hooked up, thecheck valves will allowthe smog pumpto push air into the exhaust during deceleration and cause the backfires.
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6al, 86, 94, 95, backfire, backfiring, car, decelareation, deceleration, decellerating, exhaust, gt, msd, mustang
