intake backfire
Thread Starter
Staging Lane
Joined: Dec 2008
Posts: 81
Likes: 0
From: Abingdon, VA
intake backfire can anyone help?? i have a 95 z 383 a/i headed car. a/i cam, a/i intake. holley 58mm. trick flow 36# injectors, msd coil, msd opti (adjustable one), msd 6al, racetronix fuel pump sys. valve timing is dot to dot....used a degree wheel and it was right on. 12.25:1 cr running 93 octane right now. car was tuned by bluecat up in ky. elevation is way different from where i am (i'm a lot higher). car seemed to do good up there. the only thing i have changed is the spark plugs since the tune. went from delco to ngk 8s (requested by my tuner due to application). i have a intake pop. @ night u can see fire coming out of the maf. earlier today i had the cut outs open and removed the screen from my maf (very carefully removing the retaining ring...did not damage maf sensors) and i couldn't get it to backfire. i capped the exhaust tonight and changed the oil and ran it for a bit and it is popping again. it does it from idle when you snap the throttle and sometimes on a pull under load. CANNOT be good on the engine. if anyone knows what can cause this or has been through this plz help!! thanks
Thread Starter
Staging Lane
Joined: Dec 2008
Posts: 81
Likes: 0
From: Abingdon, VA
could this be caused by too much timing? too low octane fuel?? cam timing? icm? fuel pressure is good at idle and under load so unless its a tuning issue i'm kinda ruling out a lean issue
Gone fat from loss of oxy at the higher elevation.
You improved the O2 volume by reducing air flow restriction[s]. [maf screen, and dumps open..] Close it back up...problem reappears.
What does your wide band show?
What do the datalogs show?
Fuel psi is?
12.5:1 on pump 93, [IF it IS really 93], is a bit on the ragged edge, IMO.
You improved the O2 volume by reducing air flow restriction[s]. [maf screen, and dumps open..] Close it back up...problem reappears.
What does your wide band show?
What do the datalogs show?
Fuel psi is?
12.5:1 on pump 93, [IF it IS really 93], is a bit on the ragged edge, IMO.
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Thread Starter
Staging Lane
Joined: Dec 2008
Posts: 81
Likes: 0
From: Abingdon, VA
Gone fat from loss of oxy at the higher elevation.
You improved the O2 volume by reducing air flow restriction[s]. [maf screen, and dumps open..] Close it back up...problem reappears.
What does your wide band show?
What do the datalogs show?
Fuel psi is?
12.5:1 on pump 93, [IF it IS really 93], is a bit on the ragged edge, IMO.
You improved the O2 volume by reducing air flow restriction[s]. [maf screen, and dumps open..] Close it back up...problem reappears.
What does your wide band show?
What do the datalogs show?
Fuel psi is?
12.5:1 on pump 93, [IF it IS really 93], is a bit on the ragged edge, IMO.
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Staging Lane
Joined: Dec 2008
Posts: 81
Likes: 0
From: Abingdon, VA
Thread Starter
Staging Lane
Joined: Dec 2008
Posts: 81
Likes: 0
From: Abingdon, VA
Thread Starter
Staging Lane
Joined: Dec 2008
Posts: 81
Likes: 0
From: Abingdon, VA
Gone fat from loss of oxy at the higher elevation.
You improved the O2 volume by reducing air flow restriction[s]. [maf screen, and dumps open..] Close it back up...problem reappears.
What does your wide band show?
What do the datalogs show?
Fuel psi is?
12.5:1 on pump 93, [IF it IS really 93], is a bit on the ragged edge, IMO.
You improved the O2 volume by reducing air flow restriction[s]. [maf screen, and dumps open..] Close it back up...problem reappears.
What does your wide band show?
What do the datalogs show?
Fuel psi is?
12.5:1 on pump 93, [IF it IS really 93], is a bit on the ragged edge, IMO.
