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GMC Sierra: Problems & Solutions - READ ONLY

1492 messages,  Last post on Oct 12, 2006 at 5:32 AM

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

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#1438 of 1492 HARMONIC VIBRATION 2002 GMC C/K1500 by jf3761 Jun 20, 2006 (5:49 pm)
I have a 2002 GMC Denali PU 6.0L W/Quad Steering. Between 30-40MPH I experience a vibration noice (sounds like a heat shield vibrating maybe) When the vibration begins and I hold my speed steady, the vibration will not go away. I do not lose power or feel any change in vehicle handling. It is just anoying. Does anybody have any clues Replies to this message: geo9 (Jun 20, 2006 10:48 pm) jf3761 (Jun 21, 2006 2:43 pm)
#1439 of 1492 Re: HARMONIC VIBRATION 2002 GMC C/K1500 [jf3761] by geo9 Jun 20, 2006 (10:48 pm)
Replying to: jf3761 (Jun 20, 2006 5:49 pm) JF..........Since you live in snow and salt country and your truck is a 02 I am betting on a loose heat sheild on your cat(s). Those cheap spot welds just break/rust off thus causing the vibration(s). Try driving a few wood wedges between the cat and muffler and see if it cures your problem. Replies to this message: jf3761 (Jun 21, 2006 2:43 pm)
#1440 of 1492 Loud Blower Motor by kimble989 Jun 21, 2006 (6:32 am)
Guys: My father has an 2000' model GMC Sierra with a 5.3L/V8 Vortec Engine. Nice truck with somewhere in the neighborhood of 35,000miles. Lately his blower motor is very loud when using the heater/ac/vent. I told him I would write on here and see if any one had any ideas of why this is. Just the blower motor going bad? or can something else cause this? Thanks guys, kimble989
#1441 of 1492 Re: HARMONIC VIBRATION 2002 GMC C/K1500 [geo9] by jf3761 Jun 21, 2006 (2:43 pm)
Replying to: geo9 (Jun 20, 2006 10:48 pm) Geo thanks for the advice I'll give it a try
#1442 of 1492 Correct placement for engine brackets by richmont Jun 22, 2006 (4:58 pm)
What is the correct placement for the alternator brackets on a 1989 GMC Sierra? I'm rebuilding my engine and can't figure out how to put the brackets on correctly. Any help (pictures especially) would be appreciated. Thanks, -Rich
#1443 of 1492 Re: Starting Problems [bigskyguy] by reyking Jul 01, 2006 (4:46 pm)
Replying to: bigskyguy (Jun 23, 2002 1:14 pm) sir i have a 3500 1999 chevy pick up and it is doing the exact thing your is if you figure it out let me know i replaced the fuel modulator the fuel pump and the mapp sensor and nothing has change now the are tell me to replace the fuel injector
#1444 of 1492 99 sierra 1500 transmission slipping? by jasminec Jul 03, 2006 (7:04 am)
Ok, this is a 99 v6 4x4 sierra 1500. The check engine light was on so it was taken to a garage and hooked up to the computer. They said that there was a bad o2 sensor and the computer said the transmission was slipping. We told them that it was surprising since there was nothing noticeable with the transmission. The garage then said to change the transmission (oh, this is an automatic transmission) fluid and filter. Then they would check the computer again. Well, now it noticeably slips.....badly. Even re did everything to make sure something wasn't loose or there was enough fluid. Everything looks fine, but the slipping is horrible. Any ideas? Not sure if anyone can really help but transmission work is so pricey. I'm sure we are gonna have to bite the bullet and spend a good bit of money but I wanted to see if any of you had any problems similar. Thanks to all in advance. J Replies to this message: gmctruck (Jul 03, 2006 7:29 pm)
#1445 of 1492 Re: 99 sierra 1500 transmission slipping? [jasminec] by gmctruck Jul 03, 2006 (7:29 pm)
Replying to: jasminec (Jul 03, 2006 7:04 am) How many miles are on the vehicle? What kind of transmission fluid did they use? They may have used the wrong type of fluid for your vehicle. Find out exactly what fluid they used and make sure it meets GM specs. Good luck!
#1446 of 1492 Re: Michelin Tires [shiftless] by gmctruck Jul 03, 2006 (7:53 pm)
Replying to: shiftless (May 22, 2006 5:22 pm) I don't know if you bought new tires yet, but check the door sticker on your truck to make sure they sell you the correct tire designed for your vehicle. I originally purchased the Michelin LTX M/S tires for my truck, but it felt like I was riding on under inflated balloons! The Michelins were "P" rated tires(35psi max), but my door sticker called out "LT" tires which are rated for 50psi. You can put "LT" rated tires on a "P" rated truck, but you can't put "P" rated tires on a truck with an "LT" rating. The tire shop failed to check the door label before installing the "P" rated tires on my truck. I called the Michelin support line and was told the tires had to come off my truck because it was not rated for "P" series tires. I now have the "LT" rated Bridgestone Revo's which seem to be decent tires so far. I have the 265's which are a bit smaller than the 285's.
#1447 of 1492 Weird Whine Front of Engine by jonnycanuk Jul 05, 2006 (10:57 am)
I have a 1999 GMC Sierra 5.3 l 4wd a/c etc.. Overall an excellent truck that I use for towing. The last year or so it has developed an intermittent whine from the front of the engine. Sounds like the water pump but that fix did not work. New belt did not work. Of course whenever I take it in for servicing the sound goes away. A/c or or off does not matter.   Anyone else have this problem? What was the fix?   Anyone tried to buy a PS hose for this vehicle? This aftermarket part does not exist up here in Canada...and GM wnats in the $300 range. (I have a very very small weep in the hose and that is the next repair that is planned) Replies to this message: gmctruck (Jul 06, 2006 5:59 pm)

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