84' S-10 Blazer 4x4 trouble... - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 01-27-2006, 09:13 PM Thread Starter
 
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84\' S-10 Blazer 4x4 trouble...

I am on here for a friend. He owns a 1984 S-10 Blazer and his 4 wheel drive doesn't work. It's a 2-door with the
2.8L(?)in it w/5spd. He bought it this way from his uncle. His uncle told him that it had something to do with the Vaccuum lines. I haven't been under it and it's his first 4x4. Trying to narrow down problem. Any common issues with this? Wheres the first place to look? Is there a some sort of solenoid that comes into play with the engagment process? Any help is GREATLY appreciated. Trying to get him out on the trail and see how he likes it! Thanks!!

AJ
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post #2 of (permalink) Old 01-28-2006, 08:52 AM
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Re: 84\' S-10 Blazer 4x4 trouble...

chevy did it one of two ways.

vacuum lines-

they could have cracked or fallen off.

thermal linear actuator-

electric engagement. known for going bad. the best replacement is not the stock part, but an aftermarket cable locker. for the life of me i can't remember what they are called. it has been talked about in the IFS chevy section many times.

which ever one you have will be found on the front of the diff toward the top.

most likely one of those above had died. once you find out which one you have, post it and i can help more.
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post #3 of (permalink) Old 01-28-2006, 02:11 PM Thread Starter
 
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Re: 84\' S-10 Blazer 4x4 trouble...

Thanks! So the thermal linear actuator is the name of the part that should be replaced in event that it IS vaccuum controlled?
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post #4 of (permalink) Old 01-28-2006, 10:31 PM
 
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Re: 84\' S-10 Blazer 4x4 trouble...

<font face="Comic Sans MS">On a 1984, it'll be a vacuum switch. First check all vacuum lines on engine and leading down under the truck. The switch seems to be on top of the transfer case if I remember correctly. It's been a little while since I've been under one of those, but that's where I'd start. From the vacuum switch thing on the transfer case a hose should go to a vacuum diaphragm assembly somewhere on the passenger side fender or under the battery (varied due to model, etc). That is what activates the front differential. To test whether it engages or not you can try a hand vacuum pump or similar device. Basically if the vacuum lines are ok, then perhaps the device they run to at the transfer case is bad. I'm not sure if it's in the search feature still, but in the past we had some discussion of the system.</font>
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post #5 of (permalink) Old 02-02-2006, 12:18 PM
 
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Re: 84\' S-10 Blazer 4x4 trouble...

I had a 91 S10 4x4 that had the same problem while still under waranty. The dealer replaced the vacuum solenoid.

After the waranty expired it did it again. I found where the vent tube for the vacuum actuator was hidden in the fender well beneath the battery. It had a foam cover over the end that would collect water from the wheel spinning on wet pavement. I took the foam cover off, removed the cap and sprayed it good with WD40 and kept working the lever in and out of 4wd. Eventually it started working again.

I tied the vent tube up in the engine compartment where it would stay dry and left the foam rubber off. Everytime I changed the oil I sprayed it again with WD40. I sold the truck last year and it was still working with 175000 miles.

If yours has been rusted up for a long time you will have to replace it. I don't know where it's located on the truck. That was about 13 years ago.

James
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post #6 of (permalink) Old 02-03-2006, 06:36 PM
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Re: 84\' S-10 Blazer 4x4 trouble...

4x4Posi-Lok is the name of the aftermarket engagement system. It's basically a cable operated actuator that replaces the stock vacuum or thermal set-up. I think it costs about $100, but if your friend wheels a lot, it would be well worth the money.
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post #7 of (permalink) Old 02-09-2006, 09:15 PM
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Re: 84\' S-10 Blazer 4x4 trouble...

i just bought a 1984 Chevy 4x4 S10 Blazer with a 2.8L V6 ingine and a 4spd manual transmission. and i am replacing alot of parts and was wondering if anyone knew what the park plug gap should be set at for this car? cuz i would like to set it to the right gap distance. so if anyone knows please let me know. thank you
post #8 of (permalink) Old 02-22-2006, 03:56 AM
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Re: 84\' S-10 Blazer 4x4 trouble...

It should be printed on the emissions label under the hood. Or you can ask the guy at the parts counter to look it up on his computer. Autozone usually has that kind of information.
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