Edmunds dealer partner, Bayway Leasing, is now offering transparent lease deals via these forums. Click here to see May lease deals!
Options
GMC Sierra: Problems & Solutions
This discussion has been closed.
Popular New Cars
Popular Used Sedans
Popular Used SUVs
Popular Used Pickup Trucks
Popular Used Hatchbacks
Popular Used Minivans
Popular Used Coupes
Popular Used Wagons
Comments
Ryan
When and only when I'm pulling a trailer(16ft enclosed trailer, 5000 lbs loaded, more wind drag than anything), in long, rolling hills, the cruise control will let the engine reduce speed down 4 mph beneath my set speed. Then it will accelerate very hard to get back up to speed and it overshoots by 3 mph. This is a killer on fuel economy and is a pain when it is fluctuating by approx. 7 mph. The truck has plenty of power for the load, it doesn't even have to shift down when it "floors it" to get back up to speed. I can hold the accelerater pedal with my foot and hold a more constant speed than the cruise does. But I didn't pay $48,000 to hold my foot on the accelerator pedal.
I took it to my GM dealer and they said it will do that per document ID# 1579256 "04-05 LLY 6.6L Diesel Hesitation or throttle delay-kw LLY driveability pedel performance cruise accelerate apply shift# PIP3272- (Dec 21, 2004)"
I didn't think that was acceptable from a new truck so I called the GM customer support line and accomplished nothing other than "your complaint has been filed"
I am a true GM fan and I love this truck, but if I had known of this problem, I would have gotten the 6.0 powerstroke. This truck was bought for pulling and it disappoints me while pulling but is excellent while driving empty.
Oh, and I was told that an exhaust, intake, and computer controller would nearly take this problem away, but that is $1500 for that kit from Edge and it will void my warranty. Major bummer.
Does anybody have any solutions, input or related issues???? I'd like to get to the bottom of this.
Thanks
Very true, the Fords might do it too. That's not really the point. Mine does it and it should be fixed.......
I could understand the truck losing 4 mph if it went up a quick accending uphill, but these are long hills that shouldn't catch the truck "off gaurd". It has plenty of time to react.... I sit there and watch the speedo go down and down before it finally decides to hammer it.
A GM rep called me today. I need to call him back tomorrow so I will see what he says.........
There are two cable that run from the both sides of the seat, to a electric motor in the middle. If you put your hand under the seat, they are about 5-6 inches from the front edge. The main drive motor, turns the two cables, which drive the rail sprockets, that move the chair forward or backwards.
These cables (speedometer type), are about 6 to 7 inches. Here is what I had planned to do; 1/ go to the dealership and order (2) two of the speedometer type cables; 2/ Install them both myself; 3/ Be happy as a lark.
No! No! No! It doesn't work like that. Remember vehicle designer don't design things, to make it easy on the mechanic (or you), and your wallet.
Those two (2) 6 to 7 inch cables, will cost me close to $400. BECAUSE you have to buy the whole under-carriage.
They haven't got my money yet. Hopefully, I can locate the cables through a parts place, junkyard or from a place that makes speedometer cable.
Anyway, I hope this helps someone down the line. I'll keep the forum informed, on the results.
Tenga
After doing so see how it responds.
Thanks
-out of fluid or
-leak in line or
-leak in pump or
-any combination of the above
also using the pump when there is no fluid may lead to premature pump failure.
Does anyone have any ideas what could be causing this problem? :confuse:
Greg
But now I get like a rolling vibration at 70+ kph
-David
Ed
Ed
it turned out to be the fuel regulator
Have you had any luck diagnosing your problem?
Anyone else have any suggestions or can someone recommend an appropriate troubleshooting guide or manual that would cover the 4x4 system? Thanks