4WD not engaging

Tiny
STEVENPAIGE
  • MEMBER
  • 2000 OLDSMOBILE BRAVADA
  • 200,000 MILES
I got this truck from my father a yyear ago. While he owned it he had trouble maybe 100000 miles the 4wd would not dis engage. He had it pro serviced twice because they didn't get it the first time. Aprox 150000 it would not engage had it pro serviced (now he spent more on the training than the car is worth) had a new part installed forgot the name at the moment I want to say some pressure box or somthin like that. It stopped working again won't engage4wd, While I had it I noticed the wiresfrom the transfer case were severed and coroded, I addded wire to those and just twisted them together and taped them off, that didn't work. My trans went reverse and 2nd gear went so I replaced that with a junkyard one. Also had to replace the modual for the side of the transmission that affect the nuetral safety switch also had to replace the shifter cable. Since then ( now snowing allot and no garage, no job.) Since then I noticed one of the rubber tubes that goes from the transmission to the transfer case is just dangling down on the ground, I tied uit up for the time being. The 4wd hasn'T engaged for over three years now and I have no idea what it could be, is there any cheap way to get this working again or to at least find out what the problem could be? Also is there a way to overide it and engage the 4wd manually when I need it?
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Saturday, January 21st, 2012 AT 8:13 AM

4 Replies

Tiny
STEVENPAIGE
  • MEMBER
Please guys this is my only source of transport, I have 5 kids and no job. If anything I need this truck more than ever now.
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Saturday, January 21st, 2012 AT 8:17 AM
Tiny
HMAC300
  • EXPERT
More than likely the t case and or axle solenoids are working. Your wire job of twisting the wires together didn't help either. It should be properly fixed like soldered and shrink tube over them because they are just going or are corroded as well by now. Only thing you can do is go under it with teh someone hitting the 4wd button and see if the solenoid is getting power if it is then the solenoid isprobably gone, they are $100. You may be able to disassemble it and clean it to make it work, but you sould need silicone to seal it on the ends and very lightly apply it. Sometimes that works.
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Saturday, January 21st, 2012 AT 9:44 PM
Tiny
STEVENPAIGE
  • MEMBER
I understand what your saying but I have no 4wd button. Its supposed to be automatically engaged, I'm not sure how I would guarenty it engagement so I could check it. And yes I did twist the wires and only taped them for protection. Bad move on my part, but it snowed that day and I still couldn't get it to engage. I took it to an empty snow filled lot and did everything I could think of to try and get it to engage. Is there a simpler way to ensure it should engage and still be able to check it? Keep in mind I only have the basics in my garage.(Tool wise that is.). I appreciate any info.
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Sunday, January 22nd, 2012 AT 5:35 AM
Tiny
HMAC300
  • EXPERT
The only thing I can tell you then is to check the fuse underhood and in the fuse box. The underhood is the atc one. Check your grounds. You really need a pro type scanner to see if both speedsenosrs are sending a signal. Something you can't do with atest light. The only thing you can do is see if both speed sensors frt and rear driveshafts are getting a 5 volt signal and whether or not the encoder motor it getting and sending a signal. It can also be your tcase module that is in the right kick panel that has gone bad, either from the wires touching as in your first response or the corrosion. Maybe you got lucky and the fuse underhood is blown, a cheap fix.
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Sunday, January 22nd, 2012 AT 1:49 PM

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