Question about 1987 Chevrolet S-10 Pickup

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Unplug the vacum on my 4x4 to get the 4 whelll drive to disengag

My truck is 1987 chevy s10 4x4 and the 4 wheel drive dont work right. everytime i have to unplug the vacum line from the pod to get to disengage. it will lock right in. i have to keep the line off the pod or it will lock in drive down the road

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My fan switch on my 1999 chev. s-10 want work on high speed, what's wrong

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Have a 1985 chevy s10 pick up & the 4 wheel drive wont engage. I already replaced the solenoid on top of the transfer case, & it still wont engage. I can hear the transfer case engage & I have vacum at the...


Make sure that the vacuum hose connector is connected AND connected correctly at the transfer case and at the front differential. If that is all right and the front differential still doesn't engage, then you need to test the vacuum actuator at the front differential.

Oct 25, 2013 | 1985 Chevrolet S-10 Blazer

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I have an 87 s10 pick up 2.8 v6 and i think its getting to much fuel. the air filter is soaked and it chugs and backfires. i just replaced the map sensor. thought it might be the injectors. i also dont...


Good Lord! The FILTER should never be fuel soaked. I would have it given a full tune up, have the carb tuned, and then, for heaven's sake, check the distributor timing. That, and less importantly (I doubt it's the valves if it runs) the valve/cam timing. But mostly check that distributor!

Dec 18, 2010 | 1987 Chevrolet S-10 Pickup

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1987 2.8 S10 pickup; wont engage in 4WD. drive.The vacuum canister dose not move . Dose the vacuum line go right to the shifter? And is there any type of relay involved? Or fuse ,or anything else?


There is a vacum actuator on the right side inner fender or under the battery box. Vacum line in one end, that operates a cable on the other end. This
cable engages and disengages the front axel.
Hope this helps.

Feb 28, 2010 | Chevrolet S 10 Cars & Trucks

1 Answer

Need diagram for 87 chevy s10 van 4.3 vacum hose


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2 Answers

1991 S10 Blazer has no 4wd. Has manual lever for high and low. Nothing happens when I put veh.in 4wd. Vac line is hooked up from booster.


there is a vacum maudual that screw's into the transmission were those three vacume lines connect,a little ball inside there moves up and down to controle the vacume ingageing and disengageing the 4 wheel, i had the same problem,replaced it and wooks great, you will have to go through a chevy dealer to get the part tho, auto-stores don't carry it. good luck

Dec 20, 2009 | 1990 Chevrolet S-10 Blazer

1 Answer

My four wheel drive doesnt work in my 87 s10 blazer , like when i put it in park to put it in gear the shifter on the floor goes into gear but the four wheel drive doesnt turn on ? is there any fuses or...


sounds like either a fuse or the do u have locking hubs that need to be engaged also when using 4 wheel drive there is actually only 2 wheels turning usually passenger front and driver back sometimes u also have to drive backwards to engage and also disengage 4 wheel drive finally it may be a transfer case problem check drive shafts and u joints make sure they are engaged

Oct 23, 2009 | 1987 Chevrolet S-10 Pickup

1 Answer

Stuck in 4 wheel drive and wont come out.


hey there i cant tell you what you are missing but i can tell you how to disengage the front wheels . ok you have a vacum line that runs right under the battery and a line that comes up from the front diff. to the same place ( you may have to remove batt and batt tray to get full access to this) un bolt it and temporaly put batt and batt tray back in start it up and decompress this and see if it comes out .... you should here clunking noise if it goes back in ... if thats the case just pull that big vaccum line off .... to test get all four tires off the ground and have some one put it in drive but dont hit the gas it should turn on its own ...if that dont work check the cable that runs down to the differental

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1 Answer

Four wheel drive not working on 1994 chevy blazer


I had a 90 S10 4X4 so I hope I can help. The front axle on this truck is locked by cable. The housing for this cable is found behind/around the battery. I found the vacume hose was falling off the plug and was not locking the front axle. When the truck is put into 4wheel, you can check the locking of the front axle here. Now if everything is working there, you might want to check the the transfur case is working. If the truck has electric it will have a electric motor on the side of the transfur case. If you have a manual shift on the transfur case then you would have to make sure that the rods are moving and locking into place. Hope this gives you an idea as to where to start looking.

Mar 15, 2009 | 1996 Chevrolet Blazer

1 Answer

4 wheel drive dont work


try changing the vacum switch on the trafer case

Jan 05, 2009 | 1994 Chevrolet S-10

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