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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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#1468 of 1492
Re: 2001 GMC Sierra 2500HD Hot Engine Knock [asrtaylor] by p100
Sep 06, 2006 (5:15 am)

Replying to: asrtaylor (Sep 04, 2006 7:40 pm)

It could be just engine pinging due to low octane fuel being used. Try some premium fuel and see if it disappears. When these truck engines are under substantial load, such as towing heavy trailers, they perform a lot better with higher octane.
#1469 of 1492
Re: 2001 GMC Sierra 2500HD Hot Engine Knock [p100] by asrtaylor
Sep 07, 2006 (9:59 pm)

Replying to: p100 (Sep 06, 2006 5:15 am)

THanks. I'll try that. What about using an octane boostr such as 108?
#1470 of 1492
1994 GMC 1500 pickup exhaust leak by phranc2002
Sep 10, 2006 (6:11 am)

I have a 1994 GMC pick up w/ a 350 rebuilt engine. Started making a fluttering noise under the driver's side. I think I have an exhaust leak at one of the gaskets. I have never replaced an exhaust gasket before. Can anyone offer advice or a good manaual or site with advice on how to repair. It doesent look extremely difficult. Would it be better for me to pay a profrssional exhaust guy to replace it. Any idea on cost? Thanks!
#1471 of 1492
Unusural buzzing noise from back of truck by albird1
Sep 10, 2006 (7:59 pm)
My 20021500 HD 6.0 4x4 crew cab makes this buzzing sound that sounds like an electric motor noise from the back of the truck after it is running a while at 30-50 mph. It comes and goes for a few seconds at a time. I had the fuel pump replaced at the dealer but it still makes this noise. I use the truck for long trips sometimes when towing into remote areas so I really can't afford to get stuck. Any ideas?
#1472 of 1492
Re: 94 Sierra Cut out at start [razormann] by odqlesz
Sep 12, 2006 (5:07 pm)

Replying to: razormann (Apr 29, 2006 2:45 pm)

I have a 96 Sierra 4x4 350. Similar problem. Once in a while
it would start and I would put it in drive, go two feet and
it would die. It would not crank again. I would hear a buzzing noise under the dash when I would turn the key to the start(not crank) position. Lights would flicker on the
dash, speedometer would go up to 30mph. Usually after 5 minutes of turning the ignition key, pushing in any wire connectors I could reach, pressing on brake pedal, shifting
gears, it will eventually start again. Sometimes it will
stall right back out again, other times I'm ready to go.
 
One weird thing that happened last time, I thought the radio
got fried. There was no lights on the radio after I turned
it on and no music. I did check the fuses, but that was ok.
The truck failed again today, after I got it running, not sure what I did, but now the radio works fine.
 
Any help would be great. This weekend i'm going to try to
inspect all electrical connections. I already checked all
fuses inside the truck and under the hood.
#1473 of 1492
Intermittent no start problem 96 Sierra by odqlesz
Sep 13, 2006 (3:39 pm)
I have a 96 Sierra 1500 4x4 5.7
Once in a while(about every 2 weeks) I have the following starting issue.
It starts fine, but once I go about 2 feet it dies.
I try to start it again, but no juice. It seems like there is a short somewhere.
I can turn the key to the on(not crank) position and the
lights on the dash flicker, the speedometer goes up to 30mph and I hear
a buzzing noise under the dash that sounds like when you have your door
open(but it's not that buzz). If I try to crank, nothing. It doesn't even
turn over.
After playing with it for about 10 minutes it will start again. I will try
everything. Fiddling with the connectors, shifting gears, pushing break
pedal. I don't know what exactly I did, but eventually it works again.
Sometimes it stalls right back out after going two feet other times it's
fine. It happens intermittently, sometimes in the morning or after I've
been driving for a while and stop somewhere and turn the engine off. After I get past the first two feet, it will
not happen, this only happens in the first two feet.
 
Example: one time I pushed the brake pedal a few times an shifted the
gears then it worked.
Last time I tried everything but it seemed like nothing worked. So I
pushed the horn button to see if it would work and it did, then it
started fine.
 
One time after this the radio died.(turn it on, no lights, no stations, the
casette wouldn't even go in, just hear static if i turn the volume all the way up) I thought maybe it got shorted out.
I checked the fuses, all ok. Then recently I had the starting problem
again. When I finally got it started, the radio works fine.
 
The battery is newer, connections are good. Newer alternator(this happened
before the alternator was replaced too). All fuses seem to be good.
 
Any suggestions?
#1474 of 1492
Towing with 2005 Sierra 1500 by ynotps
Sep 14, 2006 (11:42 am)
I have an 05 Sierra 1500 5.3 V8 with the towing package, bought used recently with 18,000 miles. I didn't get the owners manual. Does anyone know if this truck can handle towing a trailer rated at 6000 GVWR, or will it be too much of a strain on it? Thanks for any info!
#1475 of 1492
Re: Towing with 2005 Sierra 1500 [ynotps] by p100
Sep 14, 2006 (12:09 pm)

Replying to: ynotps (Sep 14, 2006 11:42 am)

In my opinion, 6000 lbs is the practical towing limit for a 1500 truck equipped with either 3.73 or 4.10 rear end gears. With 3.42 gears I would not exceed 5,000 lbs. With 3.23, 4000 lbs.
#1476 of 1492
'98 Silverado Tranmission Problem by ltw12000
Sep 15, 2006 (5:28 am)
Has anybody ever had their transmission rebuilt and then have the truck keep shifting out of overdrive and act sluggish?
#1477 of 1492
Re: Towing with 2005 Sierra 1500 [ynotps] by sailboatguy
Sep 15, 2006 (3:21 pm)

Replying to: ynotps (Sep 14, 2006 11:42 am)

Your truck with the standard 3.42 gearing is rated for 7000lbs, with optional 3.73 gearing, 8000lbs.
 
I've got the 3.73 and regularly tow 6000lbs without any problems. A little slow on the uphills, but it doesn't seem to be too much of a strain at all. The 5.3 is a great engine.
 
Just be sure your trailer brakes are working. The real strain happens if you try stopping the 6000lbs without them.

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