hesitation

gotime89 · January 8th, 2008, 08:39 PM

I have an 89 lx with heads,cam,exhaust,intake manifold but i havent been able to get it running right at around 1500to2500 rpms in fifth gear only do i have a problem it hesitates and backfires when i keep it in that range but if i accelerate it clears up and runs fine. so far i did the timing,plugs,wires,cap.rotor,o2sens,tps,iac,vac leaks, and nothing helps could i need a tune? also dont have cats if that matters.

ujslost · January 9th, 2008, 12:27 AM

sounds like a vac leak ( i know ya said you checked that already but still) or maybe a MAF or BAP sensor.

Iwannagofast · January 9th, 2008, 12:34 AM

i would have guessed vacuum first also.....and if i was the computer goin out you would think it would have trouble at WOT also.....maybe MAF like ujslost said

ujslost · January 9th, 2008, 12:37 AM

try unplugging the MAF and see if it changes idle or makes any noticable differance. If so then the MAF is probably ok.

January 8th, 2008, 08:39 PM	#1
gotime89 Newbie Join Date: Jul 2007 Posts: 20 iTrader: 0 reviews	hesitation I have an 89 lx with heads,cam,exhaust,intake manifold but i havent been able to get it running right at around 1500to2500 rpms in fifth gear only do i have a problem it hesitates and backfires when i keep it in that range but if i accelerate it clears up and runs fine. so far i did the timing,plugs,wires,cap.rotor,o2sens,tps,iac,vac leaks, and nothing helps could i need a tune? also dont have cats if that matters.

January 9th, 2008, 12:27 AM	#2
ujslost MM Fanatic Join Date: Mar 2007 Location: Albertville, AL Posts: 3,920 Blog Entries: 1 iTrader: 1 reviews	sounds like a vac leak ( i know ya said you checked that already but still) or maybe a MAF or BAP sensor. __________________ 1986 Mustang GT t-top time piece!

January 9th, 2008, 12:37 AM	#4
ujslost MM Fanatic Join Date: Mar 2007 Location: Albertville, AL Posts: 3,920 Blog Entries: 1 iTrader: 1 reviews	try unplugging the MAF and see if it changes idle or makes any noticable differance. If so then the MAF is probably ok. __________________ 1986 Mustang GT t-top time piece!

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January 9th, 2008, 12:34 AM	#3
Iwannagofast Hardcore Enthusiast 1990 Mustang GT havent gone since gears Join Date: Feb 2007 Location: Arkansas Posts: 2,929 iTrader: 0 reviews	i would have guessed vacuum first also.....and if i was the computer goin out you would think it would have trouble at WOT also.....maybe MAF like ujslost said

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