My 1990 4.0L 6cyl inline has a high idle also when I hit the gas it spits and jumps runs rough can any1help

 

When was the last time you gave it some love?

FULL tune-up? New air filter? Clean throttle body, idle air control?

 

Haven't tried to clean the tb or iac yet but will do

 

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/

 

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.

 

Did you reset the ecu by chance?

 

Map sensor

 

Not needed on a Renix.

 

Test the fuel pressure.

Click on the Pink Link below and do Tips 1,3,4, and 5 as soon as you can also.

 

Rarely fail. What DOES fail is the tube from the throttle body to MAP. A lot!!

 

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.

 

..... wat tips don't c no link

 

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.....