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GMC Sierra: Problems & Solutions - READ ONLY

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What is this discussion about? GMC Sierra 1500, GMC Sierra 2500, GMC Sierra 3500, Truck

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#997 of 1492 Gas Mileage by ricampbell5050 Apr 17, 2005 (2:24 pm)
I Have a 2004 GMC Sierra 1500 shortbed with a 4.3L engine and about 15 miles on the truck. I drive 35 miles one way to work, mostly interstate. I am only getting a little better than 16 miles per gallon on the highway. I took it to the dealer for a chek-up, but was told thiat it was ok. Anyone have any suggestions on improving the gas mileage? Replies to this message: prairiemike (Apr 21, 2005 5:37 pm)
#998 of 1492 Re: Sheel Metal Noise... ROOF? [serra04] by sososierra Apr 18, 2005 (4:09 pm)
Replying to: serra04 (Oct 25, 2004 6:12 pm) I have the same problem with my 04 sierra. My dealer also thinks I am hearing things. Did you ever get the problem resolved?   sososierra
#999 of 1492 Re: Gas Mileage [ricampbell5050] by prairiemike Apr 21, 2005 (5:37 pm)
Replying to: ricampbell5050 (Apr 17, 2005 2:24 pm) I've always had good fortune using Mobil One synthetic oil, K&N air filter, and 2 psi over on all four corners. I get 19-20 mpg highway with my 2001 Sierra xcab 1500 5.3.
#1000 of 1492 gearing [jimmy05] by dadoftay Apr 24, 2005 (11:28 am)
I don't remember it, but there is a formula for determining rpm based on gearing. Try a 4WD or hot rod magazine. They're always chaging tires and gears, might be an easy place to start. I don't think it'll make that big of a difference. Gaining 1-2mpg for the cost of swapping gears might take awhile to recover costs. I swapped in a lower thermostat in my Safari because my company van ran at 165 and out of the box my van ran at 195. I went through all the trouble and while it ran at 165, it didn't do anything to help the van that I saw. Just some food for thought.
#1001 of 1492 Re: 2004 GMC Sierra Turning Signal Problem [neecer] by mars1 Apr 24, 2005 (3:31 pm)
Replying to: neecer (Mar 25, 2004 11:12 am) Just saw your post. Yep, every once in a while both signals come on. I am at a loss...did you find out an answer? TIA,   Steve
#1002 of 1492 3 quirks, any help will be great by jeffbond Apr 25, 2005 (6:03 am)
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,
#1003 of 1492 Is there any help out there!!?? by mekchalngd Apr 27, 2005 (9:50 am)
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.   Replies to this message: dantana (May 06, 2005 4:56 am) nspidell (May 08, 2005 8:59 am) mekchalngd (May 10, 2005 8:40 am) dano7 (May 23, 2005 2:26 pm) and 1 more... tconover (May 15, 2005 5:31 pm)
#1004 of 1492 Re: ABS Engages at low speed-97 Z71 4WD [mikec8] by gunsntrucks Apr 28, 2005 (4:30 am)
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! Replies to this message: billybob44 (May 03, 2005 5:42 pm)
#1005 of 1492 94 GMC SIERRA CLUNK & 4WD SHIFTER CLUNKS by mpearce Apr 30, 2005 (8:19 am)
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,
#1006 of 1492 Recall Coming?? ABS Engages at low speed on Silverados... by billybob44 May 03, 2005 (5:42 pm)
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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