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Jeep Forums: XJ Cherokee Technical Forum   06-13-2021, 12:37 AM
Replies: 10
Views: 971
Posted By tjwalker
Agree with Jtec, with any code(s), the devil is...

Agree with Jtec, with any code(s), the devil is in the details.

Post the exact codes here for comment (not just a description of the code).
Jeep Forums: XJ Cherokee Technical Forum   01-04-2021, 05:34 PM
Replies: 9
Views: 566
Posted By tjwalker
Agree with Tim. With that high of a rev,...

Agree with Tim. With that high of a rev, thinking intake manifold is not seated properly on the dowel pins. When resolved and verified, I would torque bolts to spec.

Good luck and keep us...
Jeep Forums: XJ Cherokee Technical Forum   01-04-2021, 05:26 PM
Replies: 5
Views: 273
Posted By tjwalker
IAC for sure is in play here but also check...

IAC for sure is in play here but also check thoroughly for any vacuum leak.

On any engine, a vacuum leak will cause a high engine idle as the oxygen sensor detects lean operation and the engine...
Jeep Forums: XJ Cherokee Technical Forum   01-04-2021, 04:21 PM
Replies: 6
Views: 669
Posted By tjwalker
For a stock 4.0 engine, I haven't seen any...

For a stock 4.0 engine, I haven't seen any benefit to using anything but an OEM style coil. This is a "low tech" engine and the stock coil is actually very adequate.

And to boot, I have seen...
Jeep Forums: XJ Cherokee Technical Forum   12-16-2020, 02:24 AM
Replies: 44
Views: 2,424
Posted By tjwalker
This.......all of this. Engines need...

This.......all of this. Engines need compression, spark, fuel and injector pulse. As this engine was running fine and then died you can pretty safely assume compression is okay so concentrate on...
Jeep Forums: XJ Cherokee Technical Forum   07-09-2020, 10:44 AM
Replies: 3
Views: 350
Posted By tjwalker
Unless you would like to roll the dice on...

Unless you would like to roll the dice on longevity and dependability, it's Mopar only for crank sensors. I will not recommend nor install anything else.
Jeep Forums: XJ Cherokee Technical Forum   07-03-2020, 05:28 PM
Replies: 6
Views: 396
Posted By tjwalker
I agree with Tim. The most likely culprit is the...

I agree with Tim. The most likely culprit is the crankshaft position sensor. Especially if this is the original crank sensor.

They can be a bit of a hassle to install. SEARCH and you'll find...
Jeep Forums: XJ Cherokee Technical Forum   04-21-2020, 03:42 AM
Replies: 8
Views: 572
Posted By tjwalker
A very common cause of stalling at idle is a...

A very common cause of stalling at idle is a marginal battery. And yes, you can have a battery that is strong enough to start the engine but marginal enough to give the engine management system...
Jeep Forums: XJ Cherokee Technical Forum   03-19-2020, 09:21 AM
Replies: 8
Views: 566
Posted By tjwalker
Good advice given. Below are some things that...

Good advice given. Below are some things that you can do yourself to start narrowing this done. Adopt a "testing based strategy" to get to the root cause.

*Check your fuel pressure. I'd...
Jeep Forums: XJ Cherokee Technical Forum   02-11-2020, 04:30 PM
Replies: 8
Views: 440
Posted By tjwalker
1. Job #1 is to figure out why your were so low...

1. Job #1 is to figure out why your were so low on anti-freeze. You are either leaking it or burning it. First off, try to get the XJ up on a lift or jack stands and with the best light you can get...
Jeep Forums: XJ Cherokee Technical Forum   01-17-2020, 05:53 PM
Replies: 9
Views: 495
Posted By tjwalker
If you need one, I suggest purchasing a Mopar oil...

If you need one, I suggest purchasing a Mopar oil pressure sending unit purchased from Jeep. Best choice for reliability/accuracy/mating with you factory gauge.

Worth a few extra bucks....
Jeep Forums: XJ Cherokee Technical Forum   01-07-2020, 11:39 AM
Replies: 7
Views: 1,026
Posted By tjwalker
Yes, with battery removal, you will likely have...

Yes, with battery removal, you will likely have no codes.

But if the problem still exists..... after running it for a while, the codes will return.
Jeep Forums: XJ Cherokee Technical Forum   01-07-2020, 10:54 AM
Replies: 7
Views: 1,026
Posted By tjwalker
FYI, here is the "key-on, key-off" technique for...

FYI, here is the "key-on, key-off" technique for retrieving codes on an OBD1 Jeep (91-95). Hope this helps.......
Jeep Forums: XJ Cherokee Technical Forum   12-30-2019, 04:54 AM
Replies: 3
Views: 270
Posted By tjwalker
I don't see a relationship to the evap code, but...

I don't see a relationship to the evap code, but it's also not impossible either that it is related; what code are you seeing?

I would next recommend testing your ignition coil for both primary...
Jeep Forums: XJ Cherokee Technical Forum   12-19-2019, 05:48 AM
Replies: 8
Views: 453
Posted By tjwalker
I recommend only NTK. I've seen enough issues...

I recommend only NTK. I've seen enough issues with off brand ones to write a book.

NTK is the brand that your XJ came with from the factory, are reasonably priced, available widely, are plug...
Jeep Forums: XJ Cherokee Technical Forum   12-11-2019, 05:42 AM
Replies: 1
Views: 399
Posted By tjwalker
Along with increased reliability and performance,...

Along with increased reliability and performance, look at how much your learned in the process!

Nice work, enjoy your Renix XJ!
Jeep Forums: XJ Cherokee Technical Forum   09-09-2019, 06:13 PM
Replies: 6
Views: 529
Posted By tjwalker
Batteries have a finite lifespan and it is often...

Batteries have a finite lifespan and it is often much shorter than you think depending on the quality of the battery, the age, and the conditions where it is being used. How old is this battery?
...
Jeep Forums: XJ Cherokee Technical Forum   08-13-2019, 03:35 AM
Replies: 5
Views: 770
Posted By tjwalker
What is the history of "cooling system"...

What is the history of "cooling system" maintenance on this XJ? How many miles are on the current radiator, radiator cap, water pump, fan clutch, thermostat, hoses? You know for sure that the...
Jeep Forums: XJ Cherokee Technical Forum   08-10-2019, 04:34 PM
Replies: 5
Views: 443
Posted By tjwalker
The TPS is likely the 4.0 liter engine management...

The TPS is likely the 4.0 liter engine management sensor that is most sensitive to water intrusion.

Good to hear you have it sorted out....
Jeep Forums: XJ Cherokee Technical Forum   08-06-2019, 04:18 PM
Replies: 4
Views: 865
Posted By tjwalker
I've used many brands. As long as it's a quality...

I've used many brands. As long as it's a quality higher end wire, you'll be fine. Stay away from all "el-cheapos".

As for the coil, the standard OEM style coil that your XJ came with is all you...
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