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Author Topic: TJ 4.0L hesitation  (Read 257 times)
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Rubic03
Experienced Crawler, expect Moderate to Heavy Body Damage
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97 TJ
« on: August 31, 2010, 03:09:45 PM »
Hey so the jeep hesitated when i went to go for a pass. hesitated for about 1 1/2 seconds. what causes this? do i need new spark plugs? help  surrender
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moorehouse77
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Dave... FSJ the other Jeep!
« Reply #1 on: August 31, 2010, 03:17:45 PM »
Vacuum leak somewhere, TPS dirty, some other sensor dirty, bad 02 sensor, bad gas...


Dave.
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Rubic03
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97 TJ
« Reply #2 on: August 31, 2010, 03:22:12 PM »
gas is good, most likely one of the sensors is dirty, i went mudding on saturday. so maybe
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SNOTROCKET
The Dude.
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Mike Lunt. Red 85 4Runner
« Reply #3 on: August 31, 2010, 04:13:51 PM »
check to see if your air cleaner is clogged up as well. i used to have that problem with my taco when i took it muddin.
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Rubic03
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97 TJ
« Reply #4 on: August 31, 2010, 05:34:49 PM »
air cleaner is good, checked that yesterday. just got back from class, so i'll go clean some of the sensors and see how that does
« Last Edit: August 31, 2010, 05:35:29 PM by Rubic03 » Logged
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jgorm
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« Reply #5 on: September 01, 2010, 08:49:47 AM »
How bad did it hesitate? Both my jeeps have had a slight delay when going from part throttle to WOT.  I believe it is due to the calibration in the ECU and a side affect of using a MAP based system instead of a MAF based system.  My random guess is that it needs a heavier accelerator pump shot.
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Ford Custom Email and Dyno tuning
Rubic03
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97 TJ
« Reply #6 on: September 01, 2010, 06:02:41 PM »
well i just drov it over 300 miles and no hesitations. so i guess it was just a hick-up
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moorehouse77
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Dave... FSJ the other Jeep!
« Reply #7 on: September 01, 2010, 06:28:39 PM »
Good to hear!!!


Dave.
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