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  #1  
Old 05-24-2015, 10:41 PM
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Cruise jerks

Hello all. 2001 WJ 4.0 selec-trac. When cruise is engaged it surges or subtly jerks. Any ideas? Never shuts off just annoying!

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  #2  
Old 05-25-2015, 07:30 AM
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Re: Cruise jerks

Welcome to the garage.
When you keep your foot on the accelerator, there is no surging?
The problem could be the TPS (throttle position sensor), but could eventually be the cruise control itself. You first need to be sure if the speedometer indication is smooth and without any flutter, because any prolem here could result in flutter of the cruise control. (the PCM receives the speed signal from the ABS system controller, sends it to the instrument cluster and uses it to control the cruise control).
Did you check if no DTC´s are stored in the PCM? To do so, you can do the key dance: ignition switch off/run three times and leave in run at the third time. Odometer should show DONE when no faults stored, or any fault code(s).
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Old 05-25-2015, 07:33 AM
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Re: Cruise jerks

No surging with foot on accelerator. I have not checked for codes.
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Old 05-25-2015, 07:35 AM
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Re: Cruise jerks

And the speedometer indication, is it steady at steady speed, or is there a bit of a flutter to it?
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Old 05-25-2015, 07:36 AM
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Re: Cruise jerks

It is steady. Perhaps a vacuum leak?
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Old 05-25-2015, 07:46 AM
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Re: Cruise jerks

Yes, it is a good idea to check the vacuum line from the engine inlet until the vacuum reservoir, which sits below the right headlight assy (as seen from drivers seat). There is a vacuum check valve which could cause symptoms you described when not working well. It should be in the line from the engine inlet to the vacuum reservoir.
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Old 05-25-2015, 07:47 AM
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Re: Cruise jerks

Ok thanks. Just worked graveyard off to bed!
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