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I’m working on a 95 Chevy blazer and I posted something a little while back on how I couldn’t get the 4 wheel drive to work. This is strange to me because the person I bought this blazer from got a new tccm for it so I changed it out with the old one. Well it still does the same thing when you push 2 hi the 4 hi and 4 Lo blink a couple of times and neither light stays on. When you push 2 Lo both lights blink a couple of times and the 4 hi and 4 lo lights stay on and the 4×4 doesn’t work. Now this is what has me scratching my head. I accidentally forgot to plug the tccm back in after looking at it and every time I push 4 hi it will engage and work and when you push 4 lo it will engage and work however when you put it in 4 lo and drive with it in 4 lo it will drive in real lo and then when you pick up just a little speed and it shifts it shifts so hard It’s almost scary. It only seems to do this in 4 Lo and it will shift a little hard without the 4 wheel engaged but not even close as how hard it shifts in 4 Lo. Can someone please help me. Thanks again
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You may be looking at more than one issue however I think I mentioned in the other post that you need to use the 4WD properly in order for it to operate correctly and 4 low is no exception, you should drive faster than like 15mph in 4 low because that’s exactly what it’s for, low gear for torque NOT for driving down the road. Once again make sure you’re operating it correctly before you condemn anything.
hair is an update on my problem. I think I have it more isolated now and hopefully this will help others help me. the other day the idle was about 3000 rpm and at that time I couldn’t get the idle to go down to normal but with the idle t hat high every time I would put the gear in neutral and click on 4 hi it would engage I risked and did burn rubb er putting it into drive but the 4 wheel drive did work and I also did this with the 4 lo with the same results. but now I have the idle at normal and when you try to push on the buttons to engage the 4 wheel drive and it will do the same thing as I described earlier. so what I decided to do was put the car in n eutral and bring the car to idle at about 2200 rpm and sure enough the 4 wheel drive would engage at high rpm. does anyone know what would cause of this to happen? also there is a piece on the car that’s called an electric brake control front drive axle vacuum switch what puzzles me is there are 2 vacuum lines that go into a T connector and that vacuum switch I just mentioned connects into a 3/8″ hose coming out of that T connector and there is also a 3/8″ hose that goes out of that switch and is connected to nothing just hang in there but it sure looks to me that it should go on to something. please help
Hello I just had a similar issue with a vacuum line that got lose. This line that you are referring to goes to an actuator located underneath the battery tray. This actuator is what actually makes the transfer case engage. Please take a look at this and let us know if this fixed your issue.
This link may also give you some more insight –
http://www.youtube.com/watch?v=stooGR4B … kBHJMBL6Lw
Good news everyone I figured out my 4 wheel drive issue. I got frustrated so I decided to run up to the big junk yard about 30 minutes from me and look at another blazer as a blue print and I found the reason the 4 wheel drive didn’t work was the electric break control front drive axle vacuum switch wasn’t hooked up to the little vacuum tank under the little tray that holds the battery. I also used my multimeter to test the tps and it was shot so I put a new one on and between the vacuum hose getting hooked up and the tps the 4 wheel works and the idle dropped to normal from 2200 rpm. So now I feel like I’m on a roll now on fixing cars and getting some happy customers along the way. Thanks everyone for everything.
Glad you fixed it!. Feels good doing it yourself doesn’t’ it?. Thanks to all the great guys posting here. I hope one day I can contribute more to the forum
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