Cars running like Asssss.. HELP !

leathal injection · 03-28-2004, 09:29 AM

Well , its Sunday and i got the whole day off, im gonna try to get my car up to snuff. im gonna check my fuel preasure, and my TPS (i want to get my TPS to .99 right ?)

Sedanman , My motor is brand new 10.5:1 compression with a 150 shot of spray (wet), I DONT have a 6AL box , ignition is basically stock (except for an MSD blaster coil) an when i hit the juice it would backfire like crazy, i figured TO LEAN ! so i retarted my timing down to 8 degrees, and it still BACKFIRED! the car would run great w/out juice, take it to the track, runs 12.50's all day (on motor) i didnt get it , but then i thought about it... Maybe cause of my 10.5:1, and the 150 shot , maybe my spark was blowing out , so i gapped my plugs down to 30, i was right and the backfiring STOPED, and the car ran tits ! .... This was the only mod, i have made to the car (and NO i didnt leave my Timing at 8 degrees i took it back up to 14) in months.

and i gapped these plugs 3 weeks ago, i started and drivin my car 1000 times since then.. is it posible that the gap on my plugs have anything to do with my car running cruddy ?? and why would i have a problem now 3 weeks later ?

im gonna check my fuel preasure, and my TPS (i want to get my TPS to .99 right ?) what about my O2's to think they might be bad ? any feedback would be great !

03-28-2004, 09:29 AM	#1
leathal injection Registered Member Join Date: Mar 2004 Location: Long Island Posts: 58	Well , its Sunday and i got the whole day off, im gonna try to get my car up to snuff. im gonna check my fuel preasure, and my TPS (i want to get my TPS to .99 right ?) Sedanman , My motor is brand new 10.5:1 compression with a 150 shot of spray (wet), I DONT have a 6AL box , ignition is basically stock (except for an MSD blaster coil) an when i hit the juice it would backfire like crazy, i figured TO LEAN ! so i retarted my timing down to 8 degrees, and it still BACKFIRED! the car would run great w/out juice, take it to the track, runs 12.50's all day (on motor) i didnt get it , but then i thought about it... Maybe cause of my 10.5:1, and the 150 shot , maybe my spark was blowing out , so i gapped my plugs down to 30, i was right and the backfiring STOPED, and the car ran tits ! .... This was the only mod, i have made to the car (and NO i didnt leave my Timing at 8 degrees i took it back up to 14) in months. and i gapped these plugs 3 weeks ago, i started and drivin my car 1000 times since then.. is it posible that the gap on my plugs have anything to do with my car running cruddy ?? and why would i have a problem now 3 weeks later ? im gonna check my fuel preasure, and my TPS (i want to get my TPS to .99 right ?) what about my O2's to think they might be bad ? any feedback would be great ! __________________ 1990 Mustang GT Engine- 308 (bored .40 over) Probe Forged pistons (10.5:1), Scat forged crank and rods, w/Main Girdle, AFR 185 heads, GT-40 intake, CSI electric water pump. AC delete kit, No smog pump, Manual rack and pinion steering. Ignition- MSD 6AL, MSD Blaster coil, MSD hellicore wires. Drive Train- Tremic 3550, Alum. Drive shaft, 3:73 gears, Stock carrier and axels. 26X11.5 M/T Et streets. Power adder- 175 shot of laughing gas. Best ET 11.5 @120mph on squeeze, 12.4 @109mph on muscle (on gt40 heads) on the 185 heads ... ??? tba

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