stuck in 4wd
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stuck in 4wd - 12/5/2007 4:35:21 AM
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mschanha
Posts: 18
Joined: 11/16/2007
Status: offline
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 I have a 99 Silverado 5.3L 130,000mi. Engaged 4WD high for the trip home from work after the last snowfall. It didn't seem to help. Couldn't get any traction. Thought it was my crappy tires (Firestone Destination LE). Got home, tried to switch back to 2WD but the 4WD LED flashed, heard some noises under truck like it wanted to, but it just went back to 4WD. It will go to Auto 4WD. Now I'm wondering if it's not just the crappy tires, but really don't have 4WD. Had switch replaced 2yrs ago. Any ideas what's going on?
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RE: stuck in 4wd - 12/5/2007 10:15:07 AM
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dleonard2844
Posts: 95
Joined: 11/29/2007
Status: offline
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Well, im no pro, but it does sound like your 4wd is messing up. Sounds like your tcase fluid is low, wich would cause it to not want to shift out, Here's what i would do: First, are any check engine lights on? If so, get an OBD2 reader and check the codes (or have a mechanic do it, but a reader is an outstanding investment, use it twice and you get your monies worth) if not,check your transfer case fluid, is it low, or does it have metal shavings, ? check the electronics (wires and plugs) to see if anthing is loose or shorted out. Have some one drive it in 4wd drive while checking to see if the front drivshaft is spinning. if all this checks out good, check the fluid in the front diff. metal shavings? let me know how it goes.
_____________________________
'94 Stepside- snatch ropes are for girls
3 in. lift, 33 in. tires, magnaflow exhaust, topdeck bed cover, onboard air (with compressor!) and a Jesus whistle hanging from the rearview!
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RE: stuck in 4wd - 12/6/2007 4:41:43 AM
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mschanha
Posts: 18
Joined: 11/16/2007
Status: offline
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I changed the transfer case, front and rear differential fluids a couple of months ago. They looked fine, the transfer case fluid was pretty toasty. The service engine soon light is on, but it came on about two weeks before I used the 4WD. I'm assuming it's an emissions problem considering the truck runs fine. Last winter it kicked on periodically only when it got cold (< 20F). This year it popped on as soon as the temp. dropped. This weekend I'm replacing all four O2 sensors, hoping this takes care of the problem. Now that you brought it up, I've got my doubts. I figured with 130,000MI they should probably be replaced. I don't have an OBD2 reader and I'm trying to avoid taking to a mechanic ($$$). Considering I rarely use the 4WD in the summer, is there a shaft that engages the 4WD thats stuck and needs grease? I pushed the 2WD button last night, but it made the same noises, then the LED on the buttons flashed, the "service 4WD " message came on, and all the button LED's cut out. Turned off the engine, started it back up and the 4WD LED was back on.
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