- #1002 of 1492
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3 quirks, any help will be great
by jeffbond
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Apr 25, 2005 (6:03 am)
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I have a 99 GMC 1500 5.3l with 96K & 3 annoying problems, 1, the service 4WD light comes on and goes off about once a week, 2, my cabin fan motor works only in #3,4,5 speeds, 1&2 seem to work only while driving. And 3, when it drops below 18 degrees it runs rough, SES light comes on, I turn off the truck for 15 minutes re-start and it seems fine but the SES light remains on for a couple of days. I have replaced the throttle airfoil, fuel filter plugs etc…anybody experience this? Are there any quality brake pads on the market that will get this truck to stop faster than it does currently? Thanks,
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- #1003 of 1492
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Is there any help out there!!??
by mekchalngd
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Apr 27, 2005 (9:50 am)
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Replying to: yellowdog27 (Aug 29, 2004 9:51 am)
I have a 98 Sierra and am experiencing a vibration as well around the 50-60MPH while lightly accelerating. As soon as I back off or "step on" the accelerator, the vibration stops. I recently had the rad changed and it started after that. The garage said that our tires were worn, so we changed those, still there. Changed the tranny fluid, still there..
It used to do it only while in OD, not in 3rd, but now it appears more often. I've tried to sustain the vibration, but it cuts in & out, like a fan turning off and on, or something trying to "kick-in".
I tow a trailer with heavy equipment and want to get this fixed, but nobody seems to know what the problem is.
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- #1004 of 1492
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Re: ABS Engages at low speed-97 Z71 4WD [mikec8]
by gunsntrucks
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Apr 28, 2005 (4:30 am)
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Replying to: mikec8 (Mar 13, 2005 6:13 pm)
I had the same problem on my 01 GMC Z71... Not sure if the 97 is the same way, but the speed sensors in the ABS sensor (for each wheel I believe) were faulty or very dirty. I was fortunate that I had just gotten the truck a week before, and I told the dealer to fix it.. Not sure what it normally costs though.. Same symptoms, i'd be on dry pavement very low speed, not even jamming on the brakes.. and the abs would kick in.. I crapped a brick and almost through my truck in park once cause I couldn't stop and almost re-ended someone in a traffic jam where we reached all of 10 mph at best.. it was a scarey trip!! Good luck!
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- #1005 of 1492
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94 GMC SIERRA CLUNK & 4WD SHIFTER CLUNKS
by mpearce
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Apr 30, 2005 (8:19 am)
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I have a 94 Sierra that has a loud clunk noise, It is usually right under the center of the cab part, I had the transfer case off and taken in for inspection but it turned out ok, Now the clunk is mostly right under the 4WD shifter and it moves the shifter back a little when it clunks, When you hold the shifter, you can feel it , Its like something hits it hard, Ok thats when its in 2WD, then when I put it in 4WD, the clunking is in the back, Does anyone have any ideas? Thanks,
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- #1006 of 1492
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Recall Coming?? ABS Engages at low speed on Silverados...
by billybob44
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May 03, 2005 (5:42 pm)
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Replying to: gunsntrucks (Apr 28, 2005 4:30 am)
I bought a 2001 Z71 Silverado last week and the ABS was coming on at low speeds. Took it in to have it looked at and $600 later it was fixed. Same issue as everyone else on here: corroded sensor mounting surface, but mine were totally frozen in the hub and ended up having to replace them. Then this morning, while still totally P.O.'d about this, I heard on the news that the NHTSB is investigating this problem on all 1998-2002 GM Light Trucks and may force a recall. It has caused accidents due to the ABS coming on at low speeds and not stopping the truck quickly enough. My recommendation is for EVERYONE who has had this problem log into the NHTSB website and log your complaint. Maybe I'll get my $600 dollars back!
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- #1007 of 1492
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Rear Axle Shaft Noise? Re: Need help clunking noise...
by billybob44
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May 03, 2005 (5:50 pm)
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Replying to: rustyw (Apr 08, 2005 10:31 am)
I had my "new" used 2001 Siverado in the shop with a similar clunking noise at very low speed, when applying the brakes and coming to a stop. It clicked with every tire revolution. I thought it was in the FRONT, related to my ABS problems, but no, it was actually a REAR AXLE SHAFT problem. They had to replace the left rear axle shaft because it had too much "lateral play" in it. That fixed it alright, for only $650 of course. I have never heard of this type of problem, but the mechanic seemed to know about it. DOES ANYONE HAVE AN IDEA WHY REAR AXLE SHAFT WEAR CAUSES A CLICKING NOISE? Or what causes rear axle shaft wear? I'm an engineer, but I am clueless on this one.
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- #1008 of 1492
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'97 ABS - Where the Heck are the Sensors
by mikec8
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May 05, 2005 (4:51 pm)
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OK...by all the posts, I'm convinced my ABS sensors are dirty, rusty, or something. I pulled the front calipers (brakes in good shape) and looked around but couldn't find anything that looked like a sensor. Can anyone tell me where they are and how to access them?.......Thanks
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- #1009 of 1492
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Re: '97 ABS - Where the Heck are the Sensors [mikec8]
by billybob44
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May 05, 2005 (6:26 pm)
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Replying to: mikec8 (May 05, 2005 4:51 pm)
Follow the wire that runs to the top inside of the caliper. The sensor is on the end of that, pushed down into the bearing housing. The best pictures and explanation of this problem is at: http://www.mightyautoparts.com/pdf/articles/gb0804.pdf . This is a pdf file that shows pics and an explanation. Good Luck!
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- #1010 of 1492
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Re: Rear Axle Shaft Noise? Re: Need help clunking noise... [billybob44]
by billybob44
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May 05, 2005 (6:31 pm)
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Replying to: billybob44 (May 03, 2005 5:50 pm)
I'll answer my own question, since I talked to the mechanic. He said the shaft was bent by 7/1000 laterally. That caused the hub (that the wheel studs are on) to wobble slightly when it rotated, causing it to click against the internal brake band (on the emergency brake part inside the disk brake hub). Too wierd. He said it may have taken a blow to the side of the tire to bend it. I wonder if it was made that way and I am the only one to be concerned about the slight noise...
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- #1011 of 1492
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Re: Is there any help out there!!?? [mekchalngd]
by dantana
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May 06, 2005 (4:56 am)
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Replying to: mekchalngd (Apr 27, 2005 9:50 am)
I own a 2000 GMC Sierra 2500 ext. Cab. I have had the same problem with drivetrain vibration. Have been trying to diagnos for past year. Changed all U-Joints but did not fix problem. My mechanic sent out to a Transmission Repair Facility, and they found that the converter on my trany was pulling apart which was causing the vibration exactly as you described.
They recommend rebuilding the trany and replacing the converter at a cost to me of $2500 with 3 year 36k mile warranty.
Good luck
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