6.0 H.d. Engine Question

mkcom1 · February 16, 2011

Hi

Hopefully this is the right spot for this. 05 1500H.D. crew 6.0 l Okay so the basic question is that I notice and have for some time a slight shutter at idle off the motor. Runs fine at speed and generally any other time. Holds the idle okay just a slight shutter now and then. I have no check engine light so I think that would mean no codes that the computer is picking up. Fuel mileage is as it is all the time. This isn't really a big problem just something I notice. In the past when you could work on a car I would think a vacuum leak or maybe wires plugs etc. . I have replaced, after codes both knock sensors that cleared said codes , plugs, and wires, cleaned the throttle body and maf ( no reason just maint,}, and do run a K& N filter pack. Just regular stuff. Truck has about 63k on it. I would think that if there was anything wrong the computer would pick it up. I had thought that perhaps maybe slightly low fuel pressure at idle, but again wouldn't the computer pick that up? Just wondering where to start or if it is even worth it? Would a tune fix this? Ken

Stevens03 · February 16, 2011

Its not uncommon for these engines to do that. I don't think I'd worry to much about it. LQ4 motor is pretty solid.

8.1HD/ALLISON · February 16, 2011

+1 I have felt some of these trucks have a little hickup at times.

focijoe · February 16, 2011

Mine has the shutter too.

mkcom1 · February 17, 2011

Mine has the shutter too.

Thanks for the input. I have read that here and on other boards but thought I would ask. I guess that I just go back to my youth when I could tune an engine to purr at 400rpm and idle like butter. Great board and thanks again. Ken

jro909 · February 17, 2011

mine also....i also have the issue with the exhaust vibrating which ripples through the truck

HawkScot · February 17, 2011

When our 2008 Yukon XL Denali has a stutter or slight hesitation, I change brands of gas for a few thousand miles. It usually clears right up with a new full tank of different tier one brand.

I have been told that the additives are different between brands and by changing brands (and then running the same brand for several thousand miles) minimizes the deposits.

snake428 · February 18, 2011

The intake gaskets are a problem with these engines leaking vacumm causing a slightly rough idle but can take awhile to set a check engine light as well.