Rattle/Grind after long uphill climb (4.0 WJ with 242) and p1494 code - JeepForum.com
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Unread 07-04-2013, 05:42 PM   #1
lesterpolfus
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2001 WJ 
 
Join Date: Feb 2011
Location: PDX, oregon
Posts: 4
Rattle/Grind after long uphill climb (4.0 WJ with 242) and p1494 code

Hey folks,

I have a 2001 WJ Laredo with the 4.0 I6, and the 242 transfer case, with 127K miles.

I had the transmission rebuilt last year by a very reputable shop in town. It's run great ever since.

I live in South West Washington and it has been very hot here, twice we've experienced the following:

After a very long, steep uphill climb on forest roads (like gaining 2,000 feet of elevation in about 4 or 5 miles) the Jeep makes a grinding/rattling noise from the transmission or transfer case. Both times the Jeep was in 4 Full Time.

The first time my wife was driving with a friend and I wasn't in the car to hear it. For those of you that know the area, it was the road up to Silver Star mountain, and it was about 90 degrees out.

The second time I was driving, air temps were lower, in the high 70's or low 80's. Engine temp was right at 210, which is a little high for my Jeep, but it seemed reasonable, since we'd been doing a long uphill climb for several miles. I heard a grind/rattle from the transmission or transfer case area, that coincided with giving the Jeep more gas,and it didn't seem to want to respond to the throttle.

This was right before the summit of the road we were on, so we got outside, turned the car off and let it sit for a few minutes. It was fine the rest of the time.

All the fluids look good, and there's no leaks, hot smells etc.

Also, I've had an intermittent P1494 Leak Detection Pump code for the last couple weeks. I've made a cursory examination of my vacuum hoses, but haven't really dug into it.

Any thoughts?

Regards,

David

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Unread 07-05-2013, 12:06 AM   #2
cykaaro
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2000 WJ 
 
Join Date: Apr 2012
Location: orangville, ON
Posts: 2,804
First thing to come to mind, is how is your front driveshaft? More particularily the t-case side? If it is the rezeppa, is the boot ripped? That's the first place I'd look. Also what's the fluid in the t-case like?
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Unread 07-05-2013, 06:36 AM   #3
rcwj04
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2004 WJ 
 
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Location: Flemington, New Jersey
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Mine did that, now it's blown to hell. Chain is stretched, possibly even off of my gears. I'd say the transfer case is the problem. Mine did it when ever I was in 4wd and the tires spun a bit. Try to change the fluid maybe you will get away lucky.
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2004 WJ Laredo 4.0 116k
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Unread 07-05-2013, 09:28 PM   #4
lesterpolfus
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2001 WJ 
 
Join Date: Feb 2011
Location: PDX, oregon
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All looks good under the Jeep, boots and drive shafts look fine. No leaks. We just moved house so I can't find what I need to open up the transfer case, I'll locate it in the next couple days. The T-case fluid was changed out two years ago when I bought the Jeep.

Thanks for the help folks. If anybody else has ideas I'd love to hear them.
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Unread 07-07-2013, 03:59 PM   #5
lesterpolfus
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2001 WJ 
 
Join Date: Feb 2011
Location: PDX, oregon
Posts: 4
Hey guys,

The transfer case looks fine. I ran the Jeep up another hill yesterday, and got a little more info. The noise sounds like its coming from the tranny, gets better in Neutral, and goes away in Park, so tomorrow I'll be giving the rebuild guy a call.

Thanks,

David
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