going crazy !!!!!!!!!!!!!!!
 

My car will run good sometimes and sometimes it will run like crap. Within a second it will be fine then go to crap. It feels like that there is no timing, very sluggish. But a second later it will run good. I have good fuel pressure, new plugs, cap rotor wires. New o2 sensors. It doesnt matter if it is wide open throttle or not. Also there are no codes stored. It seems that there is two different motors in this car and the car decides to pick what one it wants to use. A stock motor or the one that i have in it. I have no idea what is going on. Never had this happen to it before. Any ideas ?????

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91 LX COUPE, 3.73 gears, 2 1/2 inch full exhaust, 1 5/8 shorty headers, 73 MM C&L MAF, 70 MM MAC TB, LUNATI cam, Windsor jr heads, GT 40 intake with ported lower, world class T5 with PRO 5.0 shifter, Griffin aluminum radiator, Fluid Damper, SSM traction bars, 150 HP shot N2O kit, 190 GPH in tank fuel pump with Paxton T-Rex external pump. And more to come.
BEST TIME ON BOTTLE---11.51 @123
BEST TIME ON MOTOR---12.63 @109

Just my shot in the dark, but maybe put a fresh fuel filter in and maybe upsize the thickness of your wires to make sure it's not crossfiring. Could also be vacuum or electric, check all of your grounds and for broken vacuum lines. Good luck

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88LX NOTCH 5.0, TFS Twisted Wedge Aluminum heads, 2.02 1.60 valves, BBK shorties unequal 1 5/8, off road H-pipe, Flowmasters, Drag lites, custom grind cam, solid motormounts, Aluminum Driveshaft, BBK springs, lakewood 90/10 50/50 shocks, BBK upper and lower control arms, 4.10 gears, centerforce DF clutch, adjustable BBK clutch cable with aluminum quadrant, Billet Steel flywheel, 70mm Acufab Throttle Body,MAC cold fender mount induction, K&N, 3 core radiator, flex-lite-fan, custom hardened push-

Yeah, I was thinking about the fuel filter too. Its weird, when it runs like crap it really doesnt. Its just a lot slower, no sputtering or misfiring. Maybe the injectors are going bad or just cant handle it anymore. I only have 19 lb. injectors in it. Nowhere near enough for it. Could it possibly be the ignition module????

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91 LX COUPE, 3.73 gears, 2 1/2 inch full exhaust, 1 5/8 shorty headers, 73 MM C&L MAF, 70 MM MAC TB, LUNATI cam, Windsor jr heads, GT 40 intake with ported lower, world class T5 with PRO 5.0 shifter, Griffin aluminum radiator, Fluid Damper, SSM traction bars, 150 HP shot N2O kit, 190 GPH in tank fuel pump with T-Rex external pump. And more to come.
BEST TIME ON BOTTLE---11.51 @123
BEST TIME ON MOTOR---12.63 @109

I checked the grounds and they are good. Im still going crazy!!!!!!

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91 LX COUPE, 3.73 gears, 2 1/2 inch full exhaust, 1 5/8 shorty headers, 73 MM C&L MAF, 70 MM MAC TB, LUNATI cam, Windsor jr heads, GT 40 intake with ported lower, world class T5 with PRO 5.0 shifter, Griffin aluminum radiator, Fluid Damper, SSM traction bars, 150 HP shot N2O kit, 190 GPH in tank fuel pump with T-Rex external pump. And more to come.
BEST TIME ON BOTTLE---11.51 @123
BEST TIME ON MOTOR---12.63 @109

I don't know, it may be my non-technical expertise, but I would highly suggest you take the 'stang in for an exorcism. Look in the yellow pages... http://www.mustangworks.com/msgboard/smile.gif If that fails, fuel filter.

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89 LX 5.0 Notchback, near showroom condition, Flowmasters (my dream since 16)
98 Grand Cherokee 5.9 (Very rare and hence a driveway princess), 90 VW Jetta Diesel (200K, 45 MPG and all hers), 87 Cutlass (mine) 84 Cutlass (170K of faithful service)87 Bayliner 2250 Cuddy

have you done anything to it lately? you might have knocked a vacum line or wire loose and it's is just enough to affect the car at certain times.

Go through and check everything. vacuum lines, loose wires in important areas, loose distributor clamp, whatever you can think of then change your fuel injectors. The engine might be starving for fuel with all your mods. I run 24lb injectors with my set up. Good Luck!

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90 LX 5.0 ,bored 302, MSD 6AL, Twisted Wedge TrickFlo HDs, World class T5, BBK fender cold air induct., 70mm TB,Edelbrock performer Intake, aluminum Drve shaft, 3.55 Gears, Long Tube Headers to Flowmasters.

Those are all good suggestions, but I am suspicious of the TFI module. Do you ever experience a no start condition, or has the engine just quit running?

Take care,
-Chris

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Retired Moderator
MustangNet

My site: Peckerwoods Pit Stop

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It started doing this after i put the heads and cam in it. I checked all the grounds and vaccum lines. i dont think its an intake vaccum leak because it did the same thing after changed intakes. The injectors are the stock ones with 168,000 miles on them. I bet thats what it is. I havent had any problems with it cutting off or hard starting. I need 24 LB injectors anyway so im going to replace them this week.

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91 LX COUPE, 3.73 gears, 2 1/2 inch full exhaust, 1 5/8 shorty headers, 73 MM C&L MAF, 70 MM MAC TB, LUNATI cam, Windsor jr heads, GT 40 intake with ported lower, world class T5 with PRO 5.0 shifter, Griffin aluminum radiator, Fluid Damper, SSM traction bars, 150 HP shot N2O kit, 190 GPH in tank fuel pump with T-Rex external pump. And more to come.
BEST TIME ON BOTTLE---11.51 @123
BEST TIME ON MOTOR---12.63 @109

WHOOOOOAA, I finally got a code. I decided to check the codes one more time and i have one code. 67 neutral drive swich open. I dont think it will make the car doing what its doing though. Will this swich being bad cause it to run bad????

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91 LX COUPE, 3.73 gears, 2 1/2 inch full exhaust, 1 5/8 shorty headers, 73 MM C&L MAF, 70 MM MAC TB, LUNATI cam, Windsor jr heads, GT 40 intake with ported lower, world class T5 with PRO 5.0 shifter, Griffin aluminum radiator, Fluid Damper, SSM traction bars, 150 HP shot N2O kit, 190 GPH in tank fuel pump with T-Rex external pump. And more to come.
BEST TIME ON BOTTLE---11.51 @123
BEST TIME ON MOTOR---12.63 @109

Double check and make sure your A/C and/or Defrost was turned off.

Take care,
-Chris

------------------
Retired Moderator
MustangNet

My site: Peckerwoods Pit Stop

http://homepage.mac.com/pkrwud/.Pict...sc./MyMac.jpeg

My teams site: Jim Porter Racing

RACECAR spelled backwards is RACECAR

HEY !!! Are you ASE Certified ??? If you are, ask me about iATN.