Auto Repair - Roadshow forum

Question

1996 Jeep grand cherokee choke opening

by allynnc / February 17, 2017 7:42 AM PST

Yes, I know. It has fuel injection with no choke. My jeep with 260,000+ miles runs perfectly except when it is 40 degrees or below. REPEAT- it runs perfectly at 50 degrees and up. Below 40 it starts right up goes from 3-30 blocks and dies as if the choke opened up and the mixture was too lean. I have the blinking coolant temperature sensor failure message most of the time. I have replaced both the coolant sensor and the intake air temperature sensor. It always restarts, sometimes immediately, sometimes it takes awhile. It will die at 60 miles and hour. If I can keep accelerating when it starts to die, it will not die and if I can not get caught for speeding for 30-60 seconds, the jeep will run fine without dying after the episode. Once it has died and restarted it will not die again unless the engine cools to below 40-50 degrees. I can drive it on a 300 mile trip with multiple stops with no issue. It sounds like a choke opening up too soon. I would think the air temperature sensor in the intake would be it, but while a new one delays how quick the warning comes on there is a relationship, but once it stalls and restarts or if the outdoor temperature is above 50 it won't die. How can I disable this automatic leaning out of the mixture.

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