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SUVs GMC Jimmy Encoder Motor Problem for 97 GMC Jimmy
40 messages, Last post on Oct 26, 2009 at 4:26 PM
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Problem solved. It was a severely corroded encoder motor. I took it off the T-case and found incredibly heavy metal salt deposits between the encoder case and the T-case. These deposits formed from road salt that leaked between the plastic spacer. Corrosion was so bad it warped and split the encoder case and broke the metal along one of the anchoring bolts. The plastic spacer was deformed. I took the unit apart and found rusty water in the gear assembly. The electric motor was also shot, as water leaked in from the wire connection, which in turn filled the motor casing with rust. Finding a new encoder motor is hard. They are back ordered everywhere, even on Ebay. The dealership has them but will hose you for $800 plus. I finally found a rebuilt one for $150 that had to be ordered in from Chicago. I was able to heat and press the spacer back in to shape and then sealed it to the encoder case with blue gasket material to prevent future rust. Exercised the T-case shift spline, which was fine. Reinstalled the motor and bingo, everything work great. I got my two and four wheels back. Sweet. A PM word to the wise for those with 1999 S10’s in the snow belt, check your encoder mounting before it’s to late.
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Replying to: dougaroo (Jan 02, 2007 12:30 pm) |
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Replying to: jackassjay (Oct 31, 2006 9:11 pm) In shop getting diagnosed tomorrow. Will let you know what they find.GM junk again. Kevin
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Replying to: murphy51 (Oct 30, 2007 5:45 pm) Any suggestions? Thanks |
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Replying to: repairdog (Dec 01, 2006 10:28 am) Thanks |
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2000 GMC Jimmy 4x4 4.3, VIN "W". I'm swapping a tired engine/tranny with a another used one (what a pain!!!) and when I removed the hose to the 4x4 front axle engage vac motor several ounces of tranny fluid ran out of the motor. I also noticed tranny fluid in vac hose when removing the three port connector to the vac valve on top of the transfer case. I assume the seal inside the valve has failed and sucking fluid. Does that sound likely? Will the tranny fluid ruin the vac motor, should I replace that also? Also, any known problems to look for, or parts to replace before re-installing, e.g. timing chain, water pump, etc? The "new" engine/tranny has 47,000 so it should be OK for a while.
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Replying to: Rick_M (Dec 12, 2008 1:59 pm) To prevent that from ever happening again I ran a seperate vent for the tranfer case. I also replaced all of the vac hoses from the transfer case vac switch all the way to the intake manifold. Several sections was already soft from the tranny fluid. I also ran a new line to the vac motor under the battery tray. |
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i read alot of the post's about the problems of failed 4x4, mine was stuck in 4x4 for awhile and always thought it was a cv joint, i finely got it out of 4x4 but i found there was that atc blown fuse, put a new one in and it blew, i got to the tccm and checked the wires, did seem fine, i plugged the little cable in first and the fuse did not blow, hooked up the big one and pop, where is a good place to check. i have checked wires and seem good, i did not drop the gaurd under the encoder motor to check anything there, help would be appreciated. thank you all
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Replying to: michael79 (Oct 24, 2009 5:40 am) michael
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Replying to: michael79 (Oct 26, 2009 3:41 am) |
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