Question about 2002 Oldsmobile Bravada

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When does the awd kick in on a 1999 bravada the back tires spin on wet pavement but notung from the front

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  • Master
  • 417 Answers

They shoul kick in when you have slip. If they do not then you may be having a malfunction in the system.

Posted on Oct 27, 2012

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Posted on Jan 02, 2017

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SOURCE: 2000 oldsmobile bravada all wheel drive light comes on stays on

your problem is more than likely one of a few problems
there are two hoses on your transfer case one sucks in one blows out if one gets cloged it will go out completly so have it checked its starting.
or check the oil in the transfer case

Posted on Apr 10, 2009

bonedivers
  • 1140 Answers

SOURCE: 2004 olds bravada lock in awd and dont shift out

Encoder motor might be bad.

Posted on Jul 27, 2009

  • 1 Answer

SOURCE: 2002 oldsmobile bravada smart trac all wheel drive frt tires wont engage

I can tell you exactly when my mechanic can find the part cheap enough for me to afford to replace. He's telling me its the computer sensor that automatically switches to 4WD. For now, he has taken it out so that it is in 2WD. The only thing is that the service AWD light stays on, but it works fine now even though it is only 2WD. I'll worry more about the part when it gets closer to winter. By the way, I think he said the part was $400-500 brand new. We are trying to find an after market or used one.

JB

Posted on Jul 27, 2009

  • 336 Answers

SOURCE: 02 olds bravada locked in awd

This is very common. It is the transfer case encoder motor. That controls the shifting of the transfer case. It needs to be replaced. Its not that hard to replace but the part is expensive. You will also need to replace the front drive shaft boot clamps, you have to cut the originals off when removing the front drive shaft. I've replaced many of these for myself and others. Good luck I hope this helps you.

Posted on Aug 14, 2009

Molson02536
  • 3854 Answers

SOURCE: I have a 2000 bravada and the awd doesn't isn't

I'm pretty sure the computer controlled NP-136 transfer case (which uses two speed sensors to sense the difference in speed between the front output shaft and the rear output shaft, and engages the front axle accordingly) was installed in 1998 and later models.

These trucks (mine included) use an "Active On Demand" transfer case. Basically its a normal 4x4 transfer case with a big electrically actuated (by way of a motor) clutch that connects the front prop-shaft (which is being spun by the wheels full time) to the transfer case front output. Its all in the transfer case.

Good luck and hope this help, check all the fuses and the wire harness to the encoder motor and replace the encoder motor if it has gone bad. Try bring it to a transmission shop that is familiar with the AWD system on your Bravada. The earlier years were a different system, 1998 was when the change was made. 1997 and earlier use the Borg-Warner 4472, which is always engaged with the use of the viscous coupling. Both were marketed as "SmartTrak" though.

Sounds to me like the transfer case actuator motor is either faulty or it is being told to be on all the time (which it shouldn't be).

Posted on Dec 15, 2009

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1 Answer

When I select 4 wheel drive, why does it feel as though it is binding or dragging and whining while driving?


Depending on the specific vehicle many 4WD have a transfer case that will lock the front and rear drives shafts together. This configuration is only for slippery conditions like ice and snow or very wet or off road. When turning the radius is different between the front and rear so there is a lot of feedback to the steering wheel. This is created by the fact the front set of wheels and the rear set of wheels must make the same number of turns because of the locked transfer case.

If you attempt to drive on high friction surfaces the stress to the drive train is excessive and will cause damage. The whine and the bunny hop is the drive train attempting to release this tension. If you were on a slippery surface the tires would have much less resistance turning at slightly different rates.

Also critical is the tire size need to be the same. However even with perfectly matched tires the problem on dry surfaces remain the same.

The AWD vehicles are equipped with a third differential that allows for the difference between the rotation of the drive shafts so it can drive on dry pavement no problem. Some configurations allow the AWD to have the transfer case locked which falls into the first category where dry pavement is prohibited.

Some Jeeps have a viscous coupling in the transfer case that permits limited slip between front to rear but the resistance to slip increases as the deference increases as in the event one tire is slipping
These Jeeps still have the lock up option in the transfer case requiring dry pavement when engaged.

Hope this helps?
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Jan 17, 2016 | Cars & Trucks

1 Answer

02 ford escape awd, have weird grinding sound from transfercase when on dry pavement only.it works but its a.bad noise.


You've basically answered your own question, if you want to know specifics on your transfer case I can find that out for you but it is evidently broken. Most awds have some sort of clutch mechanism inside that allows some slippage between the front and the rear. When this goes bad it will either grind like you indicated or lock up causing the tires to skip on pavement. The front and rear are working against each other causing the grinding on pavement, you won't notice this on snow, dirt, gravel or ice because your tires are sliding rather than putting so much stress on the transfer case to make it grind.

Jan 31, 2015 | Ford Cars & Trucks

1 Answer

How do i check the front axle vacuum selonoid on a 2002 jeep wrangler


02 , just sold mine, best car ever. had, of many.

how do you know that.?

and what are the tires, touching, (dirt, snow,ice, grass , pavement)

what?

this car has part time 4wd, it is not AWD

its not a Grand cheerokee with AWD.

engaging 4wd on ice free pavement is wrong.

http://www.rubicon-trail.com/4WD101/driveline-bind.html



and my fsm states.

read the operators guide in the glove box, it will say....

"2WD is intended to be driven on normal street and highway conditions, such as HARD surfaced roads."

Then

"4H & 4L positions are intended for loose slippery road surfaces only and not intended for normal driving" (They assume paved streets are normal.)

"Driving in 4H or 4L positions on hard surfaces roads, will cause, increased tire wear, and damage to the drive line components."

Unqual tire sizes, will do the same damage. "circumference mismatched"

Last: "do not attmpet to make a shift, while only the front or rear wheels are spinning" No transfer case synchronizer exists and damage will result."
(kill the gear dogs, you will)

May 26, 2014 | 2002 Jeep Wrangler

1 Answer

2005 equinox awd wont go into 4 wheel when the front tires break loose


Most new vehicles can kick in automatic but with that model the 4WD might have to be manually kicked in somewhere on the dash area. did you look at the links that have fuses in them you will have to refer to a manual with your model vehicle to find the links with fuses. Hope that helps

Jan 03, 2014 | 2005 Chevrolet Equinox

2 Answers

When do i use my gmc envoy 2006 four wheel drive or awd


4x4 when you want it locked in all the time and all when you want it to decide when to kick in

Feb 01, 2011 | 2006 GMC Envoy Xl

2 Answers

2000 oldsmobile bravada all wheel drive light comes on stays on


your problem is more than likely one of a few problems
there are two hoses on your transfer case one sucks in one blows out if one gets cloged it will go out completly so have it checked its starting.
or check the oil in the transfer case

Mar 27, 2009 | 2004 Oldsmobile Bravada

3 Answers

2002 oldsmobile bravada smart trac all wheel drive frt tires wont engage


drain the transfer case and check for metal particles in the fluid, there also may be debris bigger than that, try the fluid change in any event then if that doesn't do the trick you will have to overhaul the transfer case, this is a standard transfer case used by light duty trucks and SUV's based on a truck chassis, not the viscious drive type used bt passenger cars like Suburu

Jan 08, 2009 | 2002 Oldsmobile Bravada

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