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Old 02-24-2015, 07:23 AM
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My 1990 4.0L 6cyl inline has a high idle also when I hit the gas it spits and jumps runs rough can any1help
Old 02-24-2015, 07:56 AM
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When was the last time you gave it some love?

FULL tune-up? New air filter? Clean throttle body, idle air control?
Old 02-24-2015, 08:11 AM
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Haven't tried to clean the tb or iac yet but will do
Old 02-24-2015, 08:30 AM
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Pull a plug or two and look at condition. Check for vacume leaks. Not as well versed on the ins and outs of XJs. Check here for more ideas: https://www.cherokeeforum.com/f51/cr...x-tips-153657/
Old 02-26-2015, 09:35 PM
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K I cleaned the iac an tb I've put new plugs an wire's new cap an rotar air filter cts an o2 sensor map sensor an no change still high idle jumps and spits win try to hit the gas pedal.. had a friend link up to it but it was only showing that it's staying in open loop...any suggestions.

Last edited by kwhite90cherokee; 02-26-2015 at 09:38 PM. Reason: left out
Old 02-26-2015, 11:53 PM
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Did you reset the ecu by chance?
Old 02-27-2015, 12:17 AM
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Map sensor
Old 02-27-2015, 07:53 AM
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Originally Posted by toasterknight
Did you reset the ecu by chance?
Not needed on a Renix.
Old 02-27-2015, 07:53 AM
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Originally Posted by kwhite90cherokee
K I cleaned the iac an tb I've put new plugs an wire's new cap an rotar air filter cts an o2 sensor map sensor an no change still high idle jumps and spits win try to hit the gas pedal.. had a friend link up to it but it was only showing that it's staying in open loop...any suggestions.
Test the fuel pressure.

Click on the Pink Link below and do Tips 1,3,4, and 5 as soon as you can also.
Old 02-27-2015, 07:55 AM
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Originally Posted by 93_xjcherokee
Map sensor
Rarely fail. What DOES fail is the tube from the throttle body to MAP. A lot!!
Attached Thumbnails help-map-tb.jpg   help-tb-map-tube-2.jpg  
Old 02-27-2015, 08:22 AM
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Originally Posted by toasterknight
Did you reset the ecu by chance?
I unhooked the battery for bout an .hr got no change is there a certain way to reset the ecu
Old 02-27-2015, 08:34 AM
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Originally Posted by kwhite90cherokee
I unhooked the battery for bout an .hr got no change is there a certain way to reset the ecu
It's not friggen resetable!!!!!

That's not an issue on Renix.

Skip the rabbit trail you've gone on with the resetting. Do the Tips suggested first.
Old 02-27-2015, 08:42 AM
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Originally Posted by cruiser54
It's not friggen resetable!!!!!

That's not an issue on Renix.

Skip the rabbit trail you've gone on with the resetting. Do the Tips suggested first.
..... wat tips don't c no link
Old 02-27-2015, 09:24 AM
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https://www.cherokeeforum.com/f51/cr...x-tips-153657/

Right in pink in his signature. click this ^^^, his tips
Old 02-27-2015, 03:25 PM
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Originally Posted by Larry's XJ
https://www.cherokeeforum.com/f51/cr...x-tips-153657/

Right in pink in his signature. click this ^^^, his tips
Thanks, Larry.

He's probably using the App.....



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