My 1994 Chevy S10 will not engage into 4 wheel drive.

5

Asked by Oct 18, 2014 at 03:01 PM about the 1994 Chevrolet S-10 2 Dr LS 4WD Extended Cab SB

Question type: Maintenance & Repair

My 1994 Chevy will not engage into 4 wheel drive. The selector button only lights up in 2
wheel drive. When selecting 4 wheel drive nothing happens, no flashing light or 4 wheel
drive indicator light. Would this be caused from a bad transfer case module, bad transfer
case switch or the vacuum valve. Dose the vacuum valve send a signal to the transfer
case module?

2 Answers

20,820

Start with tthe fuse. If thats ok then check the valve under the battery tray(one or two of the bolts comes up from the wheelwell). It looks like an old cruise control module. The rubber tends to get old and brittle. It won't hold a vacuum to engage the transfer case. Look at the vacuum lines as well make sure they're not sucking air as well. If both the valve and lines are ok it could be the switch on the dash, the actuators at the front axle, a broken wire or a bad transfer case.

4 of 4 people found this helpful.
40

I've had a handful of these over the years. I'll bet the electronic 4wd switch on the transfer case is bad. Its a common problem on those vehicles. LMC Truck actually makes a old school choke style pull cable E-switch delete kit that solves this issue permanently. just pull to engage 4wd, and push to disengage. Obviously you can just replace the switch for about 40 bucks and chances are you'll be good to go for another 4-5 years.

2 of 2 people found this helpful.

Your Answer

Chevrolet S-10 Experts

  • #1
    Andrew Olsen
    Reputation
    2,560
  • #2
    John Saffrahn
    Reputation
    1,050
  • #3
    Trebor66
    Reputation
    1,040
View All

Related Models For Sale

Used Ford Ranger
201 Great Deals out of 5,553 listings starting at $1,800
Used Toyota Tacoma
697 Great Deals out of 45,610 listings starting at $2,500
Used GMC Sonoma
3 Great Deals out of 416 listings starting at $1,900
Used Ford F-150
3,159 Great Deals out of 219,406 listings starting at $700
Used Dodge Dakota
94 Great Deals out of 3,626 listings starting at $1,295
Used Chevrolet Blazer
9 Great Deals out of 946 listings starting at $950
Used GMC Sierra 1500
1,174 Great Deals out of 64,593 listings starting at $999
Used Dodge Ram 1500
443 Great Deals out of 11,110 listings starting at $2,000
Used Chevrolet C/K 1500
845 listings starting at $2,603
Used Chevrolet Camaro
437 Great Deals out of 31,440 listings starting at $1,450
Used Jeep Wrangler
465 Great Deals out of 19,328 listings starting at $2,500

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.