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Post by Shorts on Oct 20, 2007 1:33:33 GMT 11
Hey guys, long time no post. I need some help - my Wizard has been behaving until lately. Seems to happen when I first get in the truck to take off from being stopped (work, a.m., the store). What happens is on acceleration, I get this grinding sound which I assume is the tcase, sounds like it is half engaged. At the same time, the 4wd light flickers on the dash corresponding to the noise. When I let off the accelerator, the noise stops...sometimes reapplying throttle the truck is fine and sometimes the noise continues. I've tried reading the search a bit, aside from testing parts, another factor I read might be the size of the tires. Is that correct? I do know that I've really been putting off a tire rotation for quite a long time now. In fact, in the year and a half I've owned it I have no rotated the tires and put 10k on it  The psi in them are good, but it's possible diameter of each is just enough different. Can anyone shed some light, let me know if I'm headed in the right direction. Thanks |
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Post by James W on Oct 20, 2007 18:27:35 GMT 11
Sounds like it might be going into gear transfer case wise, and probably into 4WD. How does the 4WD slector feel? are you sure you have it fully into 2HI ? work the level over it's range, 2HI, 4HI, and 4LO does it feel positive? not loose at all? The slectors may have got out of sync, that is not engaging with the gear selector lever... or possibly not held by the lever.... at that stage I don't think tyre tread is the problem... it certainly should cause the 4WD light to come on. Let us know how you get on
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Post by Shorts on Oct 20, 2007 23:22:22 GMT 11
The lever as far as tension shifting feels ok. However, pulling back into 2hi is not quite matching up. The tcase will shift in 4hi normally and without effort. I have not engaged 4lo to test but I will tomorrow. I have felt for a while now that the travel into 2hi was not completely sufficient. When the lever is engaged in 2hi and free standing (me not holding the lever). But I can also pull the lever further back in its path of travel. So I have suspected a linkage type issue. However I have not inspected further as the problem is intermittent rather than 'stops if I hold the lever back'. I have tried pulling it back when the grinding does occur and sometimes the grinding stops...sometimes it doesn't. So, I'm not too clear on it.
I'll check and see what I can find in that regard. It seems that kind of issue is more inline with the noise I hear, I just cannot pinpoint it.
These selectors you mention, where exactly are they. Are they similar to a shift fork in the tcase?
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Post by James W on Oct 21, 2007 7:47:49 GMT 11
Not enough travel into Hi is a common problem after a body lift. The rubber shroud limits the travel of the gearstick and some adjustment (bending) of the gear stick is necesssary. It should not be your problem unless you have done a body lift. However you could remove the plastic trim around the gearsticks and see if the hidden underneath rubber shoroud has moved and causing problems. for a manual, it's four screws under plastic caps, remove the gearstick knobs and lift off... and see whats under there.
The slectors are the shafts or mating half that the bottom of the gearstick mates with... i have photos somewhere i'll post later on if you want. If you are keen you could also remove the rubber boot and look in deeper. surrounding the gearstick where it pivots is a plate holding it in whith three bolts. undoo these and you can remove the gearstick and see into the slectors... don't move them or you can get multiple enguagements etc. See if all looks well, nothing loose worn etc.
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Post by Shorts on Oct 21, 2007 11:12:55 GMT 11
Thanks for the method. I'll see what I see and post up. Edit: I've pulled the center cover..(its a mix of Rodeo years as far as disassembly :  ...can't really see much without pulling the metal panel holding the entire shift control system there. I'm going to crawl around again and see what else I can see. I have to be at work in a few hours so, I can't tinker too long with this today. If the weather was nicer I'd ride in, but ehhh  Edit 2: Forget in the cab. I crawled under, the tcase shift lever comes through the floor through a second rubber boot, then exposed rod into a smaller rectangular aluminum box. I stuck my hand up there and wiggled the shift lever rod...its wiggles pretty good side to side...forward to rear had virtually no play. What tcase is mounted to the 30-4LE (IIRC) tranny? Mine has no ID tag on the rear. |
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Post by wizbru on Oct 21, 2007 18:52:58 GMT 11
what year wizard - if it's around 96 then the 4x4 light is controlled be a switch on the left side of the the front dif. Mine had a problem in that it sometimes wouldn't disengage. Turned out to be a couple of broken wires to the Vac soleniods that disengage the left hand axle shafts. Pig of a fault to find. Auto electrician couldn't find it. This would cause the axle dogs to do funny things as well as driving the xfer case when it's not meant to be turning.
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Post by Shorts on Oct 22, 2007 1:34:32 GMT 11
wizbru, mine is a '96. I started reading up on trying t diagnose with the troubleshoot section of the trooper manual...but, ehhh, no vacuum measuring thingy and really, the jumble of part, pipes, pieces under there that composes the entire 4x4 system makes me tired just thinking about it. Today on my 2.5mile drive to work I paid special attention to when the grinding occurred. And it was pretty much each time I made a 90* turn at an intersection after stopping. So as I'd accelerate...brr bbrr rrr rrrrrrrrrrrrr and would let up if I let off the accelerator. Funny thing was, 9 hrs later when I left work at the end of the night, it made absolutely no noises on the trip home  I know everyone goes crazy for these small diesels, but I'm about had it with this one and its drivetrain. (yes, I realize the engine is not the culprit, but all together I want to push my truck off the pier into the Sea of Japan!) I've got more trips to do today so I'll pay attention again. |
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Post by Shorts on Oct 26, 2007 2:08:52 GMT 11
Wouldn't you know the last 2 days there's been not a peep out of the tcase and diff. Man, this inconsistency is really racking my brain!
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Post by Shorts on May 18, 2008 11:21:37 GMT 11
what year wizard - if it's around 96 then the 4x4 light is controlled be a switch on the left side of the the front dif. Mine had a problem in that it sometimes wouldn't disengage. Turned out to be a couple of broken wires to the Vac soleniods that disengage the left hand axle shafts. Pig of a fault to find. Auto electrician couldn't find it. This would cause the axle dogs to do funny things as well as driving the xfer case when it's not meant to be turning. Heh, me again - only come around when there's a problem  Still making this noise, but I was wrong where its coming from. It isn't the tcase but the front doff. Anyway, really reminds me of when I had trouble with my chevy. A spring in the switch button on the diff was thingy-eyed and it wouldn't let the gear plate inside the diff fully disengage, which caused the same sounding grinding. I'd swear this is the same. wizbru, I think you're onto it. I'll check it out. |
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The psi in them are good, but it's possible diameter of each is just enough different.
...can't really see much without pulling the metal panel holding the entire shift control system there. I'm going to crawl around again and see what else I can see.
