1994 GMC Jimmy 4 whee drive

1994 GMC JIMMY
10,000 MILES • 6 CYL • 4WD • AUTOMATIC
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GAILMA
  • MEMBER
  • 1 POST
my 4 wheel drive doesn't always want to engage, and when it does..it seems to somehow slip out of 4 wheel...it is the push button on the dash type..i understand there is a sensor under the truck that could be causing this problem..can you explain a little?
Dec 28, 2008 at 5:04 AM
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SWILLIAMS
  • ✓Experienced Mechanic
  • 597 POSTS
Sounds like you have two problems. No "sensor" that causes this problem. It is likely either a vacuum leak OR the vacuum switch on the transfer case isn't operating properly. It isn't hard to change and is available on the HELP rack in many parts stores.
Jan 3, 2009 at 8:46 AM
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