4wd doesn't work
Thread Starter
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Beginning Member
Joined: Aug 2012
Posts: 27
From: Birmingham, AL
Checked it out, front passenger wheel turns, little bit of resistance, drive shaft does not turn with the front passenger wheel - drive shaft will not turn freely - seems tcase is holding it from turning - it is the 4 button with the auto 4WD
BF Veteran
Joined: Sep 2011
Posts: 2,278
From: Texas
Yeah, the problem is in your tcase. I've rebuilt my 233 case (three button) but I think the 4 button is a whole different animal. I know on mine, you can pull the encoder motor off and shift the case with a wrench. Not sure if the 4 button is like that
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Joined: Oct 2014
Posts: 4,336
From: North Central Indiana
This is normal for 4-button. There are friction disks in the tcase that keep you from turning the driveshaft by hand.
Last edited by LesMyer; Jun 16, 2019 at 10:34 PM.
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Joined: Oct 2014
Posts: 4,336
From: North Central Indiana
Even though I hear a clunk in 4lo the 4lo light never goes steady until I say try to shift from 4lo to 2hi not in neutral, because it has to be in neutral to shift from 4lo. But if it wasn't in 4lo why would it go steady and 2hi flash like it can't go into 2hi. I have replaced the red and the blue vacuum lines. The diameter of the nozzle on the actuator is different that the diameter on the valve at the firewall. The last person used the same vacuum hose diameter as coming from the T to the valve then it goes to a vacuum adapter to another piece of hose that is the size on the actuator. I assumed this would be fine since the source vacuum line is the same, it's just staying that diameter for longer. I guess my next step would be replacing the other vacuum lines though I don't see how to do the one that disappears into the fender well
Is the Service 4WD light on?
With vehicle in 2WD HI, jack up the passenger front wheel off the ground. Leave the drivers side on the ground. Start engine (leave in park). Can you rotate the wheel that is off the ground by hand. Is the 2WD light on steady?
Now push the 4WD HI button. What happens? Is the 4WD light on steady? Can you rotate the wheel that is off the ground by hand?
Now push the 2WD Hi button again. What happens? Is the 2WD light on steady? Can you rotate the wheel that is off the ground by hand?
Report and I'll help diagnose.
Last edited by LesMyer; Jun 17, 2019 at 07:16 AM.
BF Veteran
Joined: Sep 2011
Posts: 2,278
From: Texas
Oops. I should have known better than to offer advice about the 4 button case. Learn something new everyday
Thread Starter
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Beginning Member
Joined: Aug 2012
Posts: 27
From: Birmingham, AL
Completely forget 4lo for now.
Is the Service 4WD light on?
Service light not on
With vehicle in 2WD HI, jack up the passenger front wheel off the ground. Leave the drivers side on the ground. Start engine (leave in park). Can you rotate the wheel that is off the ground by hand. Is the 2WD light on steady?
The wheel freely turns. 2wd steady
Now push the 4WD HI button. What happens? Is the 4WD light on steady? Can you rotate the wheel that is off the ground by hand?
Push 4hi and hear a relay click sound from passenger side interior along with an electronic sound underneath the driver door area. 4hi button does not stop flashing (still in park) even after over a minute. Wheel still rotates.
Now push the 2WD Hi button again. What happens? Is the 2WD light on steady? Can you rotate the wheel that is off the ground by hand?
Hear relay click again and 2hi light goes steady. Wheel rotates
Report and I'll help diagnose.
Is the Service 4WD light on?
Service light not on
With vehicle in 2WD HI, jack up the passenger front wheel off the ground. Leave the drivers side on the ground. Start engine (leave in park). Can you rotate the wheel that is off the ground by hand. Is the 2WD light on steady?
The wheel freely turns. 2wd steady
Now push the 4WD HI button. What happens? Is the 4WD light on steady? Can you rotate the wheel that is off the ground by hand?
Push 4hi and hear a relay click sound from passenger side interior along with an electronic sound underneath the driver door area. 4hi button does not stop flashing (still in park) even after over a minute. Wheel still rotates.
Now push the 2WD Hi button again. What happens? Is the 2WD light on steady? Can you rotate the wheel that is off the ground by hand?
Hear relay click again and 2hi light goes steady. Wheel rotates
Report and I'll help diagnose.
All this was done in park. When in natural there is also a metallic clunk from front axle area
Last edited by Blazer974; Jun 18, 2019 at 06:23 PM. Reason: Add
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Joined: Oct 2014
Posts: 4,336
From: North Central Indiana
I really doubt that it was. Sorry but I can't help you if you don't answer my specific questions and won't do the tests that I require.
Thread Starter
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Beginning Member
Joined: Aug 2012
Posts: 27
From: Birmingham, AL
I haven't taken it out of park in days, I wasn't taking it out of park on a jack with the tire off the ground in my garage without a functional emergency brake. I appreciate your help but calling me a liar isn't very nice, what reason would I have to lie? I couldn't get out and spin the wheel if it wasn't in park
Oh wow I just realized - look at the quoted text the answers are all there. You must have missed that part.
Last edited by Blazer974; Jun 18, 2019 at 09:10 PM.
Moderator
Joined: Oct 2014
Posts: 4,336
From: North Central Indiana
I haven't taken it out of park in days, I wasn't taking it out of park on a jack with the tire off the ground in my garage without a functional emergency brake. I appreciate your help but calling me a liar isn't very nice, what reason would I have to lie? I couldn't get out and spin the wheel if it wasn't in park
Oh wow I just realized - look at the quoted text the answers are all there. You must have missed that part.
Oh wow I just realized - look at the quoted text the answers are all there. You must have missed that part.
I asked about the Service 4WD light. I asked for results of turning the passenger front wheel under three sets of conditions (yes two of them were the same, but not the sequence). I asked about the status of the selector button lights during these three sets of conditions. You answered nothing. You apparently think you have somehow already figured out how to do a valid set of tests, and just need someone to interpret what you have done. To me this sounds very silly. Truth is..... you simply don't understand the system, my instructions, or my intent. I can't seem to help you. You can lead a horse to water......…..
That said, here's some information for you to read and understand.
https://blazerforum.com/forum/2nd-ge...-blazer-89044/
https://blazerforum.com/forum/tech-a...rmation-41198/
Good luck!
Last edited by LesMyer; Jun 19, 2019 at 11:58 AM.
Thread Starter
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Beginning Member
Joined: Aug 2012
Posts: 27
From: Birmingham, AL
Nope I missed nothing, and don't remember telling you to take it out of park (I specifically said leave it in park so you wouldn't misunderstand and try to do the test with trans in drive). My doubt was that "all of this was actually done" (You seem to be focused on "in park" for some reason).
I asked about the Service 4WD light. I asked for results of turning the passenger front wheel under three sets of conditions (yes two of them were the same, but not the sequence). I asked about the status of the selector button lights during these three sets of conditions. You answered nothing. You apparently think you have somehow already figured out how to do a valid set of tests, and just need someone to interpret what you have done. To me this sounds very silly. Truth is..... you simply don't understand the system, my instructions, or my intent. I can't seem to help you. You can lead a horse to water......…..
That said, here's some information for you to read and understand.
https://blazerforum.com/forum/2nd-ge...-blazer-89044/
https://blazerforum.com/forum/tech-a...rmation-41198/
Good luck!
I asked about the Service 4WD light. I asked for results of turning the passenger front wheel under three sets of conditions (yes two of them were the same, but not the sequence). I asked about the status of the selector button lights during these three sets of conditions. You answered nothing. You apparently think you have somehow already figured out how to do a valid set of tests, and just need someone to interpret what you have done. To me this sounds very silly. Truth is..... you simply don't understand the system, my instructions, or my intent. I can't seem to help you. You can lead a horse to water......…..
That said, here's some information for you to read and understand.
https://blazerforum.com/forum/2nd-ge...-blazer-89044/
https://blazerforum.com/forum/tech-a...rmation-41198/
Good luck!
Wow dude, let's try this again... I'm going to copy/paste my answers out of the quoted text that you have obviously missed. You're making yourself look like a fool here.
Service light not on
The wheel freely turns. 2wd steady
ush 4hi and hear a relay click sound from passenger side interior along with an electronic sound underneath the driver door area. 4hi button does not stop flashing (still in park) even after over a minute. Wheel still rotates.
Hear relay click again and 2hi light goes steady. Wheel rotates
Above are the answers to your questions. Even after I directed you to look in the quoted text somehow you still were unable to find them. I answered you on the 4WD service light, I did all your tests and posted the answers. I dunno why you are having such a hard time understanding this and you seem to be more focused on calling someone a liar than actually trying to help.