WTF
Thread Starter
Joined: Dec 2009
Posts: 1
From: florida
WTF
Well let me start by saying hello.I am very impressed with this forum.Now i need some help.2002 gt 4.6 sohc 4r70w,bbk underdrive pulleys,29lb injectors,bbk cai,bbk shorty 2-5/8 ,bbk 2.5 inch exh,40 series flowmasters,no cats,accufab 75mm tb and upper intake,typhoon lower intake,zex 125 dry shot w/purge,accel super coils,high flow fuel rail,tranny cooler,irridium plugs gaped to 40.no gears yet and no mods to tranny except hurst shifter.Now the problem is sometimes when i punch it it backfires,hesitates and sometimes even durin normal driving.Expecially when its hot out.turn car off for a sec start back up and usually i have 10 mins or so before she acts up again.changed fuel filter,tried 110 octaine mix?any suggestions.The guy who had it before me i suppose he had the computer tuned.the car has 72k on it.
3rd Gear Member
Joined: Oct 2008
Posts: 743
From: Toronto, Ontario, Canada
Well let me start by saying hello.I am very impressed with this forum.Now i need some help.2002 gt 4.6 sohc 4r70w,bbk underdrive pulleys,29lb injectors,bbk cai,bbk shorty 2-5/8 ,bbk 2.5 inch exh,40 series flowmasters,no cats,accufab 75mm tb and upper intake,typhoon lower intake,zex 125 dry shot w/purge,accel super coils,high flow fuel rail,tranny cooler,irridium plugs gaped to 40.no gears yet and no mods to tranny except hurst shifter.Now the problem is sometimes when i punch it it backfires,hesitates and sometimes even durin normal driving.Expecially when its hot out.turn car off for a sec start back up and usually i have 10 mins or so before she acts up again.changed fuel filter,tried 110 octaine mix?any suggestions.The guy who had it before me i suppose he had the computer tuned.the car has 72k on it.
Last edited by 07 GT E UPP; Dec 18, 2009 at 03:29 AM.
5th Gear Member
Joined: Aug 2007
Posts: 3,189
From:
wait....
"the guy before me i suppose he had the computer tuned". your running a 125 shot ontop of all the other mods and you havent had your car tuned? consider yourself lucky. i'd get on the dyno before you spray again. are you hearing any noises or anything else when its hesitating? also shouldnt you want to step up your fuel pump to a 255lph with the power your putting down? on the nitrous your at what, around 350rwhp? i wouldnt be doing that with a stock fuel pump.
misfires are caused by 1 of 3 things. air, fuel, spark. u can try the easy things first like fuel filter, fuel injector cleaner, clean intake filter and MAF, etc... but its likely to be spark plugs or COPS.
"the guy before me i suppose he had the computer tuned". your running a 125 shot ontop of all the other mods and you havent had your car tuned? consider yourself lucky. i'd get on the dyno before you spray again. are you hearing any noises or anything else when its hesitating? also shouldnt you want to step up your fuel pump to a 255lph with the power your putting down? on the nitrous your at what, around 350rwhp? i wouldnt be doing that with a stock fuel pump.
misfires are caused by 1 of 3 things. air, fuel, spark. u can try the easy things first like fuel filter, fuel injector cleaner, clean intake filter and MAF, etc... but its likely to be spark plugs or COPS.
1st Gear Member
Joined: Sep 2009
Posts: 89
From: Texas
check your plugs, see if any are burned up from the shot.. if the guy before you didn't get it tuned for all the bolt on's on there, then its time for a tune.
Last edited by vanbibber; Dec 18, 2009 at 02:05 PM.
