4.0 replacements and upgrades
04-18-2012, 04:15 PM
#1
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Year: 1989
Model: Cherokee
Engine: 4.0
I've search around for this thread but couldn't find it. My xj has 258k miles on it, and its an 89. I wanted to know what parts I should replace or upgrade engine wise. I've replaced simple things like spark plugs&wires and distributer cap. But what else should I replace and what can I add to get a little more juice out of it?
Last edited by my89xj; 04-18-2012 at 04:21 PM.
04-18-2012, 05:40 PM
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
60mm throttle body from www.strokedjeep.com.
Have your exhaust pipe re-done without the "crush" and re-routed as necessary.
Get some rebuilt 4 hole injectors from some of the guys on this forum or www.precisionautoinjectors.com.
Have your exhaust pipe re-done without the "crush" and re-routed as necessary.
Get some rebuilt 4 hole injectors from some of the guys on this forum or www.precisionautoinjectors.com.
04-18-2012, 08:01 PM
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Year: 1989
Model: Cherokee
Engine: 4.0
Originally Posted by cruiser54
60mm throttle body from www.strokedjeep.com.
Have your exhaust pipe re-done without the "crush" and re-routed as necessary.
Get some rebuilt 4 hole injectors from some of the guys on this forum or www.precisionautoinjectors.com.
Have your exhaust pipe re-done without the "crush" and re-routed as necessary.
Get some rebuilt 4 hole injectors from some of the guys on this forum or www.precisionautoinjectors.com.
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04-18-2012, 08:03 PM
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Year: 1990
Model: Cherokee (XJ)
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04-18-2012, 09:00 PM
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[quote=my89xj;1711339]
Why does who sell so many what?[/QUOT
Sorry, why do they sell you so many injectors?
You need one per cylinder.
Originally Posted by cruiser54
Why does who sell so many what?[/QUOT
Sorry, why do they sell you so many injectors?
04-18-2012, 09:06 PM
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Year: 1988
Model: Cherokee
Engine: i6
[quote=my89xj;1711339]
Why does who sell so many what?[/QUOT
Sorry, why do they sell you so many injectors?
4 holes is too many...: )
Originally Posted by cruiser54
Why does who sell so many what?[/QUOT
Sorry, why do they sell you so many injectors?
04-18-2012, 09:16 PM
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Year: 1994 1993
Model: Cherokee
Engine: 4.0
Yes you'll see more gain from a good set of 4-port "upgrade" injectors. Not only because the 4-port ones deliver the fuel more efficiently but yours are probably pretty stuffed up after 258,000 miles.
04-18-2012, 09:19 PM
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Year: 1989
Model: Cherokee
Engine: 4.0
Originally Posted by Programbo
Yes you'll see more gain from a good set of 4-port "upgrade" injectors. Not only because the 4-port ones deliver the fuel more efficiently but yours are probably pretty stuffed up after 258,000 miles.