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Stalling out..


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davidic30549
New User

Aug 20, 2018, 5:29 PM

Post #1 of 2 (87 views)
Stalling out.. Sign In

2001 Jeep Grand Cherokee, 4.0 L, 200K miles. Cranks up immediately.. runs smooth but with in 5-10 minutes or it reaches optimal temp it shuts off and will only crank after its sits for an hour. Ive replaced fuel filter, ignition coils, crank shaft position sensor and removed catalytic converter.
Any advice would be greatly appreciated !


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 20, 2018, 7:05 PM

Post #2 of 2 (69 views)
Re: Stalling out.. Sign In

You need to do more diagnosing and less throwing parts at it.



All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.



Every engine requires spark, fuel and compression to run. That's what we have to look for.

These are the basics that need to be tested and will give us the info required to isolate a cause.

1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.


2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.


3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.



Once you have determined which of these functions has dropped out,
you will know which system is having the problem.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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