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Unread 06-13-2013, 04:37 PM   #1
BuzzZJ9er
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Doggy 5.2

My wife had a 98 5.2 limited with 31/10.5/15 mud tires. It was struggling to turn more than 3500 RPMs in the mud. I seafoamed it and took it out today just to see it only turn 2000-2500 RPMs.

Any ideas? It needs a tune up but don't have the money right now. We have a mud bog sat and I need this jeep to turn on and show everyone what a zj can do!

Can I wire brush the plugs and distributed cap and rotor? Could this help?
My other thought was maybe a bad cat.. If it was hot and buried in cold mud/water could it cause the cat to go bad?

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Unread 06-13-2013, 04:45 PM   #2
wood04
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just wondering, but you are wheeling in 4 LOW correct? if not thats your problem. If you are in 4 LOW, can you tell us what it is doing on the road?
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Unread 06-13-2013, 05:18 PM   #3
BuzzZJ9er
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No it's in regular full time. It doesn't see the road really but last time it went fine. I tried getting in 4 low today but the linkage needs adjustment. The lever won't go back enough to engage.
How hard is it to adjust? Never tried it before.
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Unread 06-13-2013, 07:30 PM   #4
Technohead
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My first guess would be a clogged catalytic converter.
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Unread 06-13-2013, 09:55 PM   #5
dnuccio
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linkage is easy to adjust. just loosen the bolt, make sure the tab on the tcase is pushed as far foward it will go, and have someone hold the lever inside the jeep as far foward as it will go. then tighten up the bolt
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Unread 06-13-2013, 10:47 PM   #6
BuzzZJ9er
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Thank you guys. Ill adjust the linkage and go from there. If its the cat it should bog even in 4low right?
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Unread 06-14-2013, 09:14 AM   #7
PolkaPower
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You shouldn't need 4 lo for mud. It would be screaming at 4000 rpms in mud. You need momentum and a steady foot.
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Unread 06-14-2013, 02:36 PM   #8
BuzzZJ9er
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Quote:
Originally Posted by PolkaPower
You shouldn't need 4 lo for mud. It would be screaming at 4000 rpms in mud. You need momentum and a steady foot.
That's what I thought. I hold it in 2cd so it should float right up to the rev limit... I'm going to check out my cat tomorrow am before we start.
I gotta show theses boy that a zj ain't just leather and power windows! They run wranglers and full size trucks. I caught heck last time cause it wasnt running...
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Unread 06-17-2013, 07:37 PM   #9
BuzzZJ9er
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Tried a new cat and not the problem. looked pathetic sat but another zj showed up stock and faired pretty well.
I'm lost as what to do next.. Any ideas?
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Unread 06-17-2013, 08:06 PM   #10
PolkaPower
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Plenum pan gasket?
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Unread 06-17-2013, 08:07 PM   #11
BuzzZJ9er
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Quote:
Originally Posted by PolkaPower
Plenum pan gasket?
Maybe. I did notice oil burning on the valve cover. How do I test this?
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Unread 06-17-2013, 08:17 PM   #12
PolkaPower
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Quote:
Originally Posted by BuzzZJ9er View Post
Maybe. I did notice oil burning on the valve cover. How do I test this?
If it's never been repaired it's 99% guarantee that it's bad. It happens to every magnum motor due to a design flaw.

To check it take off the throttle body and look into the intake with a flashlight towards the rear. When you see oil you will know it's bad.
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Unread 06-17-2013, 08:44 PM   #13
BuzzZJ9er
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Ok guess ill check it out. Motor has 190k and doubt its been done. Is it a hard thing to replace?
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Unread 06-17-2013, 08:45 PM   #14
PolkaPower
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Quote:
Originally Posted by BuzzZJ9er View Post
Ok guess ill check it out. Motor has 190k and doubt its been done. Is it a hard thing to replace?
No just time consuming. And you need a decent inch pound torque wrench.
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Unread 06-17-2013, 08:48 PM   #15
BuzzZJ9er
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Quote:
Originally Posted by PolkaPower

No just time consuming. And you need a decent inch pound torque wrench.
I bought one to use on my trans last year. thanks for the help! I'm going to price this out and hope to start this weekend.

Edit: the trans is acting weird too.. All gears it tries to move forward. Figured i would include all info even if it may not be related. A guy at work said it may be my trans linkage causing both problems..... But he likes to tell stories! :rotfl:
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