Question about 1988 Chevrolet K1500

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My 1988 k1500 4x4 the four wheel drive is not engaging

It was working before but took almost 30 to 40 seconds sometimes longer to engage then a had bigger tires put on it now it wont engage at all and the 4x4 light for the front axle will not come on, it has electric 4x4 not vacuume

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There is an acuator in the front diff the are common to quite in late 80 to early 90 Chevrolet's / GMC

Posted on Nov 17, 2012

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6ya6ya
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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 4 wheel drive not working

when you engage it in 4 wheel make sure you are getting vacuum to the acuator just pull the hose off and feel to see if there is vacuum if not check all vacuum hoses

Posted on Jan 25, 2009

blueextc3221
  • 15935 Answers

SOURCE: four wheel drive wont engage

If you have push button 4-Wheel Drive, it is recommended that you use it every once in a while, in order to keep gunk, rust, and corrosion to build up on moving parts. The mostly likeley (though not definite) reason would be that you let the 4-wheel drive unused for so long that corrosion has built up on the parts and the actuator that engages the 4-Wheel Drive doesn't have the power to engage it past the corrosion. You'll need to take it in to be cleaned, or to have parts replaced. In the future, every month or so, engage 4-Wheel Drive and drive around in some mud, grass, sand, or any other loose ground for a bit, just to keep the parts moving and clean.

The service Four wheel drive light is to alert the operator the system is not being read properly by the ECU.

If the ECU loses contact with or position of the Transfer case actuator motor the service light will come on. Same thing goes for the front diff actuator.

So it may be a bad switch, sensor, or an actual problem in the 4WD linkage. This is not a Oil Change light that you can ignore a few extra weeks - it indicates a problem that should be taken care of ASAP to avoid costlier problems down the road.
Thanks for using FixYa - a FixYa rating is appreciated!!

Posted on Feb 21, 2009

  • 59 Answers

SOURCE: 4x4 wont work

If you can have the codes scanned in your vehicle it would be very helpful to you. If you have a code for the encoder motor sensor or the encoder motor itself on the side of the transfer case, this is where i would begin, quite common with the push button 4 wheel drive. Thanks for using fixya!! good luck

Posted on Mar 15, 2009

  • 1168 Answers

SOURCE: 4 wheel drive will not engage front axle.actuator

On the front axle of your Suburban there is a thermally (an internal heater) activated devise that pushes on a lever to engage the axle. There is a technical service bulletin ( #76-43-01A) on this problem but the repair isn't cheap.It involves installing an updated devise with a DC motor from General Motors which also requires a new wire harness.
I have found that installing an aftermarket one (available at your local autoparts store) that just bolts on will work just as well.
It just threads in to a housing and is very easy to replace.

Posted on Nov 02, 2009

gladys_neal
  • 334 Answers

SOURCE: I have a 2001 Chevy 2500 4X4. Four wheel drive not

Sounds like the chain in the transfer case has broke or the linkage is out of adjustment

Posted on Dec 08, 2009

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