wont start when engine warm
12-26-2010, 05:24 AM
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Model: Cherokee
wont start when engine warm
93 jeep Cherokee 4.0ltr, v6, fuel injected... having issue where once engine is hot it wont start, but fires right up when cold. Sounds like starter is turning fine, but wont fire as if there's either no fuel or spark. suggestions?
12-26-2010, 05:30 AM
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Year: 1999
Model: Cherokee
Engine: 4.0
The two most common causes of thermal (heat related) failure on the Jeep 4.0 are the crankshaft position sensor and the ignition coil. In that order.
Without the input signal from the crank sensor to the computer, you will NOT have spark, and you will not have fuel going TO the fuel injectors.
Here is a link to a good article on the crank sensor. I'd recommend testing that sensor when the engine fails to start. Testing it when it is running may be of no value.
http://www.jeepforum.com/forum/f11/c...ailing-639123/
Without the input signal from the crank sensor to the computer, you will NOT have spark, and you will not have fuel going TO the fuel injectors.
Here is a link to a good article on the crank sensor. I'd recommend testing that sensor when the engine fails to start. Testing it when it is running may be of no value.
http://www.jeepforum.com/forum/f11/c...ailing-639123/
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