Need help bad !!!
Thread Starter
On The Tree
Joined: Mar 2003
Posts: 153
Likes: 0
From: Mechanicsville, VA
Need help bad !!! Let me start stating I'm a newbie, I have transplanted a 98 SS LS1(approx 30k on it) into a 86 Monte SS. I have autotap and LS1 Edit. I finally got everything hooked up and car started first try. that was a good thing (WooHoo). I have Z06 intake, hooker LTs,true duals(no cross over as of yet) no cats and rear o2's deleted w/edit, Granetti 85mm maf,stocl TB, MTI B1 cam, manley springs, double roller timing chain, hi volume oil pump, Walboro 340 in tank FP. Ok now you know what I have here is my problem besides being really lost w/FI systems.
1st car idles fine, raised it to 800.
I don't see any IAC counts, I took it out and verified that it does move in and out when I turn ign on and off.
DTC's say low voltage to tps. ON atap i can see it move.
never see any knock, Timing hunts alittle at idle averages about 18%, inj pulse width bank 1 4.84, bank 2 4.76.
OK now the right header doesn't get very hot and backfires loud alot( i assume it's dumping fuel into it for some reason)
I can't let it idle to operating temp w/o it backfiring and nearly stalling. Neighbors think I'm hunting rabbit over here in my garage.
I know this is long but I need help, Ive been reading everything on this site for weeks now learning good info. But I am lost. PLease help
1st car idles fine, raised it to 800.
I don't see any IAC counts, I took it out and verified that it does move in and out when I turn ign on and off.
DTC's say low voltage to tps. ON atap i can see it move.
never see any knock, Timing hunts alittle at idle averages about 18%, inj pulse width bank 1 4.84, bank 2 4.76.
OK now the right header doesn't get very hot and backfires loud alot( i assume it's dumping fuel into it for some reason)
I can't let it idle to operating temp w/o it backfiring and nearly stalling. Neighbors think I'm hunting rabbit over here in my garage.
I know this is long but I need help, Ive been reading everything on this site for weeks now learning good info. But I am lost. PLease help
ttt please help 
On The Tree
Joined: May 2003
Posts: 106
Likes: 1
From: Apache Junc, Az
Re: Need help bad !!! With the key ON, you should have about 4.5 volts at the orange (or white/black) wire at the TPS connector. If not, you have a problem with the PCM or the wire going from the PCM to the TPS.
Check voltage at the orange/dark blue wire. Voltage should go from 0 to 5.0 in a smooth and steady manner as you open the throttle. If it doesn't, you have a bad TPS.
Then check the TPS ground at the brown/yellow wire and make sure the ground is good. If not, repair the ground as required.
If you are backfiring due to a miss, this is possibly a bad module or coil pack.
P.S. I have had many problems getting ATAP to read IACs and other sensors on an LS1. I recommend getting EFILive. It is free and will work with your ATAP cable. It is just that you need to register if you want to record log files.
Check voltage at the orange/dark blue wire. Voltage should go from 0 to 5.0 in a smooth and steady manner as you open the throttle. If it doesn't, you have a bad TPS.
Then check the TPS ground at the brown/yellow wire and make sure the ground is good. If not, repair the ground as required.
If you are backfiring due to a miss, this is possibly a bad module or coil pack.
P.S. I have had many problems getting ATAP to read IACs and other sensors on an LS1. I recommend getting EFILive. It is free and will work with your ATAP cable. It is just that you need to register if you want to record log files.
