1989 xj 4.0 renix

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02-16-2016, 12:20 PM

Davemo1989

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Model: Cherokee

1989 xj 4.0 renix with idle at 1500-3000rpm after engine swap

I have jeep xj 4.0 renix I did a engine swap recently now my idle is running away between 1500 an 3000 rpm idle drops some when I unplug map sensor replaced map sensor with no luck cleaned iac valve last night with no luck . Was wondering if a intake leak could cause this ? Or what else could cause my idle to run so high ?

Last edited by Davemo1989; 02-16-2016 at 12:26 PM.

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02-16-2016, 01:34 PM

LiamLikeNeeson

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Year: 1989 Limited

Model: Cherokee(XJ)

Engine: I-6 4.0L AMC Renix

I have an 89 too. Your throttle body butterfly vale can be stuck open even the slightest amount. Do all of Cruiser54's tips (in Write Up section) and you should be good and some.

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02-16-2016, 08:59 PM

cruiser54

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Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by LiamLikeNeeson

I have an 89 too. Your throttle body butterfly vale can be stuck open even the slightest amount. Do all of Cruiser54's tips (in Write Up section) and you should be good and some.

www.cruiser54.com.