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When warm 4.0l engine stumbles then dies then won't start.

Old 04-22-2019, 01:52 PM
  #1  
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Join Date: Oct 2014
Location: NH
Posts: 44
Year: 1998
Model: Cherokee (XJ)
Engine: 4.0L
Default When warm 4.0l engine stumbles then dies then won't start.

I have a 98 4.0 that will start run for about 30 mins then start to stumble. Then no throttle respons then die. Then it will crank and not start. Untill cooled down. I have tested TPS at volts.77 at idle then WOT it's at 3.77. it has spark when running and spark when it's only cranking. When it dosnt want to start. No DTC. Could temp sensor be failing telling ecu to shut down. Engine seems really hot IR temped near the temp sensor at 225 to 230 F then when therostat opens drops to 200 to 215. Running out of ideas that it could be. Thanks
smittysxj is offline  
Old 04-22-2019, 05:29 PM
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Sounds like classic crank position sensor failure. It fails when it gets hot and then works when it cools down. There are a ton of threads on testing resistance on the CPS terminals. Here is a bleepin Jeep video of testing:
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Old 04-22-2019, 09:11 PM
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Join Date: Oct 2014
Location: NH
Posts: 44
Year: 1998
Model: Cherokee (XJ)
Engine: 4.0L
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Originally Posted by dzywicki View Post
Sounds like classic crank position sensor failure. It fails when it gets hot and then works when it cools down. There are a ton of threads on testing resistance on the CPS terminals. Here is a bleepin Jeep video of testing: https://www.youtube.com/watch?v=dPb6q40iAEY
I've checked CPS only before it started to act up not when it was warm should I check it again when it's acting up.
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