Question about 1991 Chevrolet S-10

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1991 Chevy S10 Automatic-4WD will not engage

Where is the swith located on the transfer box to check or replace the vacuum?

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It is on the top left hand side hould feel three vacuum hose plugging into it

Posted on Jan 16, 2009

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4 wheel drive won t engage


Vacuum hoses and connection under vehicle on transfer case. Sometimes vacuum switch goes bad also. Worst case, the control module for the 4wd

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some of those are vacuum controlled the most common place for them to break is just behind the engine at the intake passenger side check there first. another thing that comes to mind would be the 4x4 accuator located on the front of the front axcel is simply removed by unplugging it and unscrewing it counter clock wise.

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2003 F-150 regular cab automatic transmission and the 4WD will not engage.


Operationally vacuum shifts the front axle between 2WD and 4WD mode. The GEM ( Generic Electronics Module ) applies ground to the solenoid needed for the mode selected on the switch ( for ESOF ) or when the transfer case shift lever is moved ( MSOF ).The contact plates in the transfer case signal the GEM that the transfer case is engaged, and the Vacuum solenoids need to be activated ( either 2WD to 4WD or 4WD to 2WD ).


Lift and support the front of the truck so the front wheels are off the ground ( take safety precautions, chock wheels, jack stands, etc )
Key on, engage 4x4 and try to turn the front drive shaft.
- If it turns it is a problem with the transfer case.
- If it doesn't it is a front axle engagement problem.

- If the front drive shaft does not turn :
•With the truck running ( with front wheel back on the ground ), switch from 2WD to 4WD and back again, the vacuum shift motor should move the lever on the front axle.
{ picture of shift motor }
-- If the vacuum shift motor does not move:
•Check for vacuum on the lines while shifting between modes. Pink vacuum line is 2WD mode, Light Blue vacuum line is 4WD.
•Check the fuses for the 4WD system and the solenoids.
•Check the vacuum lines from the vacuum shift motor to the solenoids on the firewall.
•Check the vacuum lines from the solenoids to the vacuum reservoir box behind the battery.
•Check the vacuum reservoir box for cracks.
•Typical solution is the vacuum lines ( to the solenoids or to the vacuum shift motor ) are cracked or the vacuum shift motor has a cracked diaphragm and has water in it.
•Could be the shift plate contacts in the transfer case are corroded / not making good contact, and not activating the solenoids.
sscullys_111.jpg

- If the front drive shaft turns:
•For ESOF system
-- Check the fuses for the transfer case, engine compartment fuse panel, 17 & Cab fuse panel fuses 13 and 23 ( verify with owners manual, 97-97 & 99-03 MY can be slightly different on some items ).
-- Try hitting the transfer case with a dead blow hammer ( do not use a metal hammer, it can damage the transfer case ) to see if the transfer case shift motor is hung up .
-- Check the transfer case connector, to make sure the connector pins are clean and making good contact.
•For MSOF systems
-- Check that the shift linkage on the transfer case is moving when the lever is moved from 2W to 4H and 4L.

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1991 Chevy S10 Blazer 4.3 4x4


4170636.jpgThis is all I've got.Hope this helps?

Dec 20, 2009 | 1991 Chevrolet S-10 Blazer

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1989 Chevy S10 Blazer, 4.3L V6. 4wd not working.


under the battery is where you need to check first,then follow it down around the right front wheel well,

Dec 08, 2009 | 1989 Chevrolet S-10 Blazer

4 Answers

4 wheel drive will not engage - how do I troubleshoot


The vacuum switch on the transfercase is most likely the problem. If you remove it and the plunger is stuck in, replace it and your 4wd should engage again.

Oct 05, 2009 | 1989 Chevrolet S-10 Blazer

2 Answers

1998 Chevy S10 front axle will not engage when put into 4 wheel


Normal thing that happens as long as onone (worked) on it, is the vacume hose going to the engage sevevo under the battery box has fell of on either end or is brocken on the way there. Then the once or now leaky battery acid ate up this same servo. then the cable going to the front axel breaks sticks falls off or even someone needing one climbed under your truck while parked somewhere to get one to replace their brokeen one now you don't have one then theaxel engage arm or gearset is damaged

Aug 16, 2009 | 1998 Chevrolet S-10 Pickup

1 Answer

98 Chevy S10 4wd drive will not engage when button is pushed


your problem sounds like either the transfer case control module located where you hear the clicking sound, or the actuator on the transfer case itself.

try unplugging the transfer case control module and then plug it back in, try engaging 4wd again (make sure your in neutral, coasting at 1-2 mph might help as well) if it still doesn't work check the actuator itself to see if the actuator is trying to engage. if the actuator is trying to engage but doesn't, take the actuator out and check it for wear or damage. if the actuator seems fine and it responds to the buttons when pressed i'd go after the transfer case control module as the culprit. ran into that a few times on those s-10's. 3 out of 4 that i've seen were fixed with a new tccm. 1 of the 4 needed an actuator, check your local junk yard for a working tccm or actuator.

hope this helps!

Feb 17, 2009 | 1998 Chevrolet S-10 Pickup

1 Answer

Chevy s10 4 wheel drive will not engage


There is a vaccuum operated switch located on the transfer case that sends vaccum to the accuator that pulls a cable that locks the front end in. Check for vac coming in and out of this switch if no vac out replace it. This switch is a very common problem. You can find them at most parts stores in the help section #49315. please rate.

Dec 08, 2008 | 1991 Chevrolet S-10

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