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'01 4.0 Stalling After Driving at Speed for Couple Hours


 
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peterjeep
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Joined: 27 Nov 2006
Location: Atlanta, GA

PostPosted: Tue Nov 28, 2006 5:29 am    Post subject: '01 4.0 Stalling After Driving at Speed for Couple Hours Reply with quote

My girlfriend's '01 4.0 manual trans with 55k miles has a weird problem. Runs fine, but drive 2 - 2 1/2 hours at speeds over 65 mph, and it will lose power, ultimately to the point that the accelerator is not responsive.

Pull over, turn the car off, start it again, and with the car stationary, you can rev the engine and it runs fine. Put in gear and try to drive forward, and it stumbles again, to the point of stalling (never reaching significant speed). Let the car sit for 5 - 10 minutes, and then you can drive the car again, AS LONG AS you don't go over 60 mph. Go 65, and it stumbles again.

In looking under the hood when this happened, no vacuum hoses appeared to be loose or disconnected, there was nothing the smelled overheated.

I thought maybe it could be something like the crank position sensor (CPS), fuel pump, some sort of heat sensor or something. But I know SAABs, not JEEPs. Need your help! What ideas do you folks have?

Many thanks.

--Peter Ingram
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WhatWasIThinkin
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Joined: 02 Jan 2004
Location: Epping New Hampsha

PostPosted: Wed Nov 29, 2006 3:03 pm    Post subject: Reply with quote

Using an oil air filter? If so the excess residue can do funny things to the sensers.

If no, have you checked to see if your getting error codes?
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T.O.W. Vehicle
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Joined: 15 Jun 2004
Location: Summerville, SC

PostPosted: Thu Nov 30, 2006 4:35 am    Post subject: Reply with quote

Had a rubber fuel line cause a situation similiar to what you're describing. Seems the interior wall pulled away and during higher fuel demands, restricted fuel flow to the point that the engine would die. Same syptoms as a dirty fuel filter kinda.

I would think that if it were a sensor causing your problem you would get an error code and that if the computer is going into a "limp in mode" it would stay in that mode even after shutting the engine off.

What you're describing sounds like a pressure difference or heat related problem to me.
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