Will only start if I hold down gas pedal

KWC2005

MEMBER
1991 JEEP WANGLER YJ
4.0L
6 CYL
4WD
MANUAL
104,000 MILES

I tried starting the vehicle this morning and it would crank but would not start. The only way I could get it to start was to hold down gas pedal. Any help? The fuel pump and injectors were replace about three months ago. (Wrangler model)

Tuesday, January 16th, 2018 AT 7:53 AM

1 Reply

CARADIODOC

MECHANIC
33,871 POSTS

Will the engine run okay if you hold the accelerator pedal down just 1/4"? If it does, most likely the battery was recently disconnected or run dead. The Engine Computer immediately stats to rebuild learned data that was lost from memory, except for "minimum throttle". The computer needs to see a very specific set of conditions for that relearn to take place. To meet those conditions, drive at highway speed with the engine warmed up, then coast for at least seven seconds without touching the pedals. Do not shift into neutral or push on the clutch pedal.