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Old 06-15-2005, 06:32 PM   #1
skiwesser
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Default Backfiring??

What would cause it to backfire on WOT 1-2 & 2-3 shifts?
I dont't think I have any exhuast or intake leaks, how can these be checked for? None audiable.
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88 GT: subs,pullies, 1 3/4 longtubes, flowmasters, AFR 165's,T,F #1 cam,Thyphoon intake, 24# inj., 73mm C&L,65mmT.B., 190LPH pump, Eagle sir rods, forged pistons in a newly rebuilt 306.

DYNO TUNED TO 300.97 RWHP 337RWTQ
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Old 06-15-2005, 06:38 PM   #2
HotRoddin
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Default Re: Backfiring??

At what RPM ? Maybe you're floating the valves ?
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Old 06-15-2005, 07:56 PM   #3
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Default Re: Backfiring??

If you have the air injection reactor (air pump) system still on your car, replace the one-way check valves and check to see that the diverter and atmospheric dump valves are operating and properly connected. That or you're getting air introduced into the exhaust where and/or when it shouldn't be.

On the other hand, if you're leaning out, you need to check the fuel pressure while on a WOT run.

Hope this helps.
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Old 06-15-2005, 10:14 PM   #4
skiwesser
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Default Re: Backfiring??

It does it when I powershift at 5200-5400RPM.
Smog stuff all gone.
Have pressure guage on shrader valve. Adjustable FPR set at 40psi.
190lph pump
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88 GT: subs,pullies, 1 3/4 longtubes, flowmasters, AFR 165's,T,F #1 cam,Thyphoon intake, 24# inj., 73mm C&L,65mmT.B., 190LPH pump, Eagle sir rods, forged pistons in a newly rebuilt 306.

DYNO TUNED TO 300.97 RWHP 337RWTQ
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Old 06-19-2005, 01:48 AM   #5
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Default Re: Backfiring??

I replaced blown header gasket, found a bad wire.
Backfiring much less, but still once out of eight or ten shifts, ecespecially on the spray (60 shot)
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88 GT: subs,pullies, 1 3/4 longtubes, flowmasters, AFR 165's,T,F #1 cam,Thyphoon intake, 24# inj., 73mm C&L,65mmT.B., 190LPH pump, Eagle sir rods, forged pistons in a newly rebuilt 306.

DYNO TUNED TO 300.97 RWHP 337RWTQ
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