I don’t want to provide you with any negative information, but it Appears very similar to what I just went through… and it absolutely was the Transfer Circumstance that desired assistance… terribly. My Blazer possibly only has 10-15 hours about the 4WD process, still the “forks†Within the TC were being badly worn and allowing for my gears to float, which made signs such as you describe (between Other folks).
What it feels like is you will have an encoder motor difficulty — Here is the motor over the aspect with the Transfer Circumstance that controls the shifting of the assorted “modes†(2Hi, 4Hi & 4Lo).
Have a look at the schematic “front axel switch & pcm.jpg†— and then have Yet another think about the wires within the TCCM (Transfer Situation Command Module), Positioned beneath the passengers kick panel.
Here are some more pictures of the TCCM. They're not mine, but I Truthfully can’t remember who sent them to me at the moment (I just discovered them whilst cleaning up the backend of the site and didn’t know they were being there.). When they are yours, let me know and I’ll article Image credits. Thanks!
That’s odd that The sunshine will arrive on instantaneously, with no flashing and without the need of engaging the 4WD. The sound gentle coming on at 4Hi will likely be a sign which the process is purposeful.
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Ideally, Additionally, it provides Some others the encouragement / self-assurance to deal with Careers such as this by themselves!
So, you’re expressing which the lights Will not flash when trying to engage 4Hi? That’s a bit distinctive, with a couple a lot more tiny points to examine since the lights should flash If your TCCM is obtaining the signal.
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I know I’ve probably just rambled on and told you almost nothing — nicely, which was only my thought method when seeking to uncover a dilemma. I can only hope it assisted. Let me know the way you make out. If I visualize anything, I'll update this submit.
In case you hear the click from the TCCM, that informs you that the relays are working and are trying To place the encoder motor in equipment. There are plenty of motives for this to occur, damaged/leaking vacuum traces to get started on. The encoder motor wires may very well be undesirable. There is a “plastic bushing†that keeps a “fork†from the transfer scenario while in the placement (properly, the fork keeps the gears in the appropriate placement)… When the plastic bushing is worn, it can cause the transfer case to not change (this transpired to me, even so the signs were being that the technique would swap to 4Hi/4Lo, using a significant clunk, and it was very difficult for getting it back outside of 4WD.)
Unfortunately, I don’t know the responses to most of one's thoughts — I can guess, but that’s what it’s going to be, a guess.
Hmmm… doesn’t audio like a TCCM problem… Appears extra like an encoder motor issue, or probably a transfer situation problem.
Tips? It’s been one thing right after Yet another now for 5 yrs….Im so close to returning it to chevy…. correct thru the front window