Backfire after header install?
05-10-2009, 08:24 AM
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Backfire after header install? so i put on my pacesetter long tubes and every now and then it back fires when i rev it or let off the throttle...any ideas/suggestions?
05-10-2009, 10:21 AM
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Check wires to see if they are fully connected to coil packs and plugs. Take out plugs and check each one for oil or build up( your choice). or it just could be back pressure. its common to backfire a little with no cats when letting of the throttle correct me if im wrong. also what are your plugs gaped at?
05-10-2009, 10:25 AM
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it has cats...well one of the cats got smashed up a bit and lets just say the ceramic insides fell out out...but the car isnt throwing any codes or anything...could a tune with hp tuner software help?
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05-10-2009, 10:39 AM
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The # 8 cylinder plug can be reached with mediocre difficulty if you have a jack and jack stands available. jack up the car and reach up to wear the collector for the stock manifold would connect to the cat. its kinda a pain but it beats reaching past the AC and EGR(if you have it).
05-10-2009, 10:45 AM
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yeah i can get to the plug but not where the wire plugs into the coil pack...arms are to thick lol...it sucks being 6'6" and weighing 250...at least when it comes to working on cars...
05-11-2009, 09:37 AM
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Is the car actually backfiring or are you just hearing some popping coming from the exhaust when you let off the throttle?
A backfire would sound like a gun is going off and people all around you would be ducking for cover. After I installed headers on my old 88 IROC I messed up the firing order (every wire on my distributor was one terminal off) and it BACKFIRED....yikes!
On the other hand, my Firehawk with a LM2 and stock manifolds pops when I let off the throttle until everything is warmed up.
Steve
A backfire would sound like a gun is going off and people all around you would be ducking for cover. After I installed headers on my old 88 IROC I messed up the firing order (every wire on my distributor was one terminal off) and it BACKFIRED....yikes!
On the other hand, my Firehawk with a LM2 and stock manifolds pops when I let off the throttle until everything is warmed up.
Steve
05-11-2009, 09:54 AM
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its probably just popping then...i've heard i might just need to change my spark plugs..but i read a horror story on hear about the plugs braking off in the head...that doesnt sound fun at all...
05-11-2009, 10:27 AM
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Im not sure how much just adding headers effects your A/F ratio. But when i did my heads and headers i had bad backfires from running too rich. If you can get it checked for misfires and your A/F at WOT. I took it out yesterday and im still running a bit rich...Someday when i can afford some wide band O2s i will be happy 
