Author Topic: XJ Help  (Read 112 times)

Online Ryean78

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XJ Help
« on: September 25, 2017, 12:58:24 PM »
My friend Bryan has an XJ that died while driving out on the highway a few months back. We have been slowly tinkering with it. The jeep turns over just wont fire. This week end we finally crawled under it changed the crank sensor (pita) still dead. Changed the distributor cap and rotor. Changed the spark plugs, the wires. Changed the ignition coil and boom she fires up. This is where it gets interesting, and I am lost. I take it out for a test drive it and the truck will not rev over 3000 RPMS. I have checked the firing order I am sure that is correct. I am looking for some ideas on what could possible be going on. Side note when its in neutral it will rev above 3000. The wires Bryan bought are thinner could that be the problem? I can always put the others back on as they looked to be in good condition.

Thoughts are welcome.

Offline XJRV-Maki

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Re: XJ Help
« Reply #1 on: September 25, 2017, 01:30:42 PM »
TPS?

What year is it?

Offline RedJeepster1

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Re: XJ Help
« Reply #2 on: September 25, 2017, 01:34:25 PM »
That was a 98, right? Any engine codes? Usually a good place to start.


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Online Ryean78

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Re: XJ Help
« Reply #3 on: September 25, 2017, 02:02:00 PM »
98 XJ
I have not checked for codes. No idiot light is on. I thought possible transmission but if it was slipping RPMs would go up.

Online Ryean78

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Re: XJ Help
« Reply #4 on: September 25, 2017, 02:10:27 PM »
TPS?

What year is it?

TPS... I didn't think about that.

Offline MassXJ

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Re: XJ Help
« Reply #5 on: September 25, 2017, 02:23:19 PM »
Pull the battery terminal for a while then try again
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Offline Greenhorn

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Re: XJ Help
« Reply #6 on: September 25, 2017, 02:27:54 PM »
If it is a TPS thing, the entire throttle body is probably crusted with black stuff and needs to be removed and cleaned.
I've cleaned a TPS by turning them upside down and blasting them real good with carb cleaner, (put them in a small container)
blast it until its submerged then let it soak.
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