- #1 of 22
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2000 Chevy Blazer ZR2 Turning Problems
by kennyu05
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Feb 03, 2007 (10:51 pm)
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Ok, I just bought a used 2000 Blazer ZR2 w/ 68000 miles on it. Not bad for a 2000. Anyways. I didn't notice this until I had already purchased the vehicle. When I turn very sharply on pavement (say to park) the front wheels seem to skip. It only does it when turning sharply. What could be causing this problem? Is this a normal thing for ZR2s? I've been reading through forums but haven't found anything similar to this. I am wondering if it's a problem with the differential or something. Maybe the 4 wheel drive won't disengage? I drive primarily in 2 wheel high. But it has the problem in 4 wheel also.
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- #2 of 22
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Re: 2000 Chevy Blazer ZR2 Turning Problems [kennyu05]
by repairdog
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Feb 04, 2007 (5:23 am)
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Replying to: kennyu05 (Feb 03, 2007 10:51 pm)
3 button dash switch I'd say with the np233 case so the front driveshaft should not turn in 2wd - go under and see (grab it and turn when off and parked of course). If its engaged in 2wd then you probably have a bad 3 port vac switch on the transfer csae or the encoder motor that activates it is stuck in that position (when 4Hi selected the motor steps once and engages the vac switch for the front axle coupler and the driveshaft. 4Lo steps again for lower gear. If 4 button Autotrac let me know thats alittle different. If the TCCM is locked up (4wd computer) then pull battery power for 30 min to reset and see if that clears it.
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- #3 of 22
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Re: 2000 Chevy Blazer ZR2 Turning Problems [repairdog]
by kennyu05
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Feb 04, 2007 (12:57 pm)
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Replying to: repairdog (Feb 04, 2007 5:23 am)
I just did some "testing". I took it to a gravel parking lot and tested the 4 wheel drive. It is a 3 button dash. When in 2hi and I take off the front wheels don't spin. If I put in 4hi they do. But when I have it in 2hi and I'm turning in to a parking space, it feels like I have posi-traction in the front. Which I think is making the wheels skip on the pavement. Any Ideas?
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- #4 of 22
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Re: 2000 Chevy Blazer ZR2 Turning Problems [repairdog]
by kennyu05
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Feb 04, 2007 (1:18 pm)
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Replying to: repairdog (Feb 04, 2007 5:23 am)
I tried your test. The front drive shaft spins freely. But like I said in my other message, it still feels like I have posi-traction in the front when turning sharply. Does the front differential lock and unlock when 4 wheel drive is engaged? If so, maybe the differential is locked up? If this is how it works, how does the differential engage and disengage. Vacuum hose? If it is, where does that hose connect at? And where does it come from?
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- #5 of 22
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Re: 2000 Chevy Blazer ZR2 Turning Problems [kennyu05]
by repairdog
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Feb 04, 2007 (3:35 pm)
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Replying to: kennyu05 (Feb 04, 2007 1:18 pm)
Comes from the transfer case 3 port switch and ends under the battery tray at the actuator that is vac and pulls the cable to the front axle coupler - have to pull the battery and tray to get to it - or crawl under and pull the line from the transfer that runs up to it and see if vac on it in 2wd - if so plug it and test drive to see it it unlocks the front axle.
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- #6 of 22
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Re: 2000 Chevy Blazer ZR2 Turning Problems [repairdog]
by kennyu05
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Feb 04, 2007 (3:44 pm)
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Replying to: repairdog (Feb 04, 2007 3:35 pm)
So should there be a vacuum on it in two wheel or no vacuum in two wheel?
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- #7 of 22
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Re: 2000 Chevy Blazer ZR2 Turning Problems [repairdog]
by kennyu05
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Feb 04, 2007 (4:59 pm)
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Replying to: repairdog (Feb 04, 2007 3:35 pm)
So it's possible that a leak in that hose could be causing the problem. If there's no vacuum then the front differentials won't unlock... right?
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- #8 of 22
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Re: 2000 Chevy Blazer ZR2 Turning Problems [repairdog]
by kennyu05
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Feb 04, 2007 (8:01 pm)
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Replying to: repairdog (Feb 04, 2007 3:35 pm)
I have been reading some other posts on this site and realize that I made a mistake. I was thinking that there is supposed to be a vacuum on the line under the battery in 2wheel drive. When in fact there shouldn't be. I will have to check this out sometime soon. Or take it to a mechanic. I bought a warranty for it so I might as well use it.
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- #9 of 22
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Re: 2000 Chevy Blazer ZR2 Turning Problems [kennyu05]
by repairdog
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Feb 05, 2007 (4:05 am)
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Replying to: kennyu05 (Feb 04, 2007 8:01 pm)
You got it - no vac to front actuator in 2wd. The 3 port switch on the transfer case always has a vac to it and the encoder motor steps once when 4Hi pressed and opens the vac port to the front and when 2wd pressed closes to front and opens a vent that releases vac to front and closes off the engine source.
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- #10 of 22
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Re: 2000 Chevy Blazer ZR2 Turning Problems [kennyu05]
by jlink87
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Mar 26, 2008 (5:15 pm)
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Replying to: kennyu05 (Feb 03, 2007 10:51 pm)
i also have a 2000 zr2 blazer and when i first got it i thought there was something wrong with it when i was turning sharply, but it turned out its the posi-traction rear differential. Could be the same for you.. just a suggestion.
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