I'll get to mine before April for sure. Will you? :L As far as reliability goes I think Toyota generally does really well. I also have an '89 2WD Toyo pickup that I've owned for nearly 10 years with 145K that has had relatively few problems until recently. This last summer the tranny stopped downshifting properly and I had to buy a shift solenoid ($85) and a filter kit and fluid. A Saturday afternoon and a few beers later it was fixed. Thank God for diagnostic codes! A few months later I now have a bad vibration in the drive train so it is parked until it warms up. I don't want it dropping a drive shaft and leaving me walking in 10 degree weather. I'm hoping it is just a U-joint or something simple (as if a U-joint is simple!).
As said previously, the front hubs are engaged via a solenoid or a vacuum diaphram. My '83 S-10 Blazer uses a vacuum diaphram system that is actuated by a vacuum switch mounted on the transfer case. If a vacuum system, then there are three areas to inspect, the vacuum lines, the vacuum switch or the vacuum diaphram. I have had to replace both the vacuum lines and the switch in my Blazer, but then I guess that is not bad after 260,000 miles. By the way, JC Whitney sells a mechanical system to replace the Chevrolet vaccum system, but it isn't cheap.
Mike
The most common failure that I have found on my Jeeps and on co-workers Blazers have been vacuum lines. Leaking, deteriorated, and once in awhile just plain off.
I appreciate all the help. I will certainly try to get this worked out. It is nice to know I turn to the great people of CAC for help. Now which one of you wants to come up to northern indiana and fix it for me
I have 93 Chev K1500 that had a similar problem. It turns out that if you don't engage the 4wd enough, the electrically activated solinoid stops working. It apparently uses freon in a seal capsul that is heated with an electrical element to engage the hubs in the front differential. The part is about $50, but the dealer told me that right after the first snow they get quite a few people comming in with non-engaging 4wd systems. The trick is to use the 4wd option more often to keep things working. I try to engate it 1 time every couple of months or if I'm on dirt for any length of time. - Ron
Okay here is the scoop, it is fixed. I checked all the components for the ADD system. They all checked out okay. So then I was stumped. I then checked the vacuum source for the vacuum operated solenoids, and noticed that there was very little vacuum. I thought that was odd. I started checking around and heard a hiss coming from that general location. I found a line that had come off a T fitting. It was fairly hidden. Not sure how it came off, but it is on now. The 4WD works great. To anybody with a toyota truck equipped with this ADD system, vacuum is very important. Thanks for everyones help.
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