Misfire- help
Thread Starter
Staging Lane
Joined: Dec 2003
Posts: 81
Likes: 0
From: Acworth, GA
Misfire- help lt1 motor
Problem was that i was getting break up high rpms and on the bottle the shot was not effective
1st i replaced the plugs and gapped them lower .35 ngk tr6
2nd i replaced opti with a newer one i had laying around from another motor.
after this step the break up was even worse after u drive it for a bit. initially the car would run strong through the gears for about 1 - 2min then very bad break up.
3 test ohms in spark plug wires.
possibly this is where the problem is. i know its 40-50 ohms per foot does this seem okay?
Cyclinder 1 55 ohms
Cyclinder 2 64 ohms
Cyclinder 3 65 ohms
Cyclinder 4 89 ohms
Cyclinder 5 75 ohms
Cyclinder 6 112 ohms
Cyclinder 7 110 ohms
Cyclinder 8 126 ohms
My coil is a new msd coil as well. possibly defective?
Suggestions to the issue, other trouble shooting suggestions.
Problem was that i was getting break up high rpms and on the bottle the shot was not effective
1st i replaced the plugs and gapped them lower .35 ngk tr6
2nd i replaced opti with a newer one i had laying around from another motor.
after this step the break up was even worse after u drive it for a bit. initially the car would run strong through the gears for about 1 - 2min then very bad break up.
3 test ohms in spark plug wires.
possibly this is where the problem is. i know its 40-50 ohms per foot does this seem okay?
Cyclinder 1 55 ohms
Cyclinder 2 64 ohms
Cyclinder 3 65 ohms
Cyclinder 4 89 ohms
Cyclinder 5 75 ohms
Cyclinder 6 112 ohms
Cyclinder 7 110 ohms
Cyclinder 8 126 ohms
My coil is a new msd coil as well. possibly defective?
Suggestions to the issue, other trouble shooting suggestions.
Last edited by radd; Jul 1, 2006 at 01:39 PM.
This site has a section on testing the LT1 coil, was my buddies problem, bad mad blaster coil, I used a multitester, found the ohms to be off, sure enough was the problem. It's in this section under how-to's I'm pretty sure so search till you find it.
His how-to is for a stock coil which has a different resistance than msd's, somewhere on ls1tech I posted the correct ohms for the msd, maybe someone knows what it is or do a search here. good luck
His how-to is for a stock coil which has a different resistance than msd's, somewhere on ls1tech I posted the correct ohms for the msd, maybe someone knows what it is or do a search here. good luck
Thread Starter
Staging Lane
Joined: Dec 2003
Posts: 81
Likes: 0
From: Acworth, GA
so i figured out what was causing the bad miss
The TPS was bad now i face another problem. I and loosing power all over feels fuel related. My plugs look clean as a whistle so im guessing im running lean. now i need to find out if its the FPR sensor or fuel pump. my guess is fuel pump because it does decent on motor but on the bottle its awful! spraying a 150 shot with stock pump might have killed my pump what do you guys think?
The TPS was bad now i face another problem. I and loosing power all over feels fuel related. My plugs look clean as a whistle so im guessing im running lean. now i need to find out if its the FPR sensor or fuel pump. my guess is fuel pump because it does decent on motor but on the bottle its awful! spraying a 150 shot with stock pump might have killed my pump what do you guys think?
