My tip for plug #8

[Erik G]

LOL I try to reserve that for worse. Like the sensors under the intake manifold.

 

[sumo]

I called mine a dirty dirty ***** bag when I was trying to align the supercharger to the intake ports while trying to keep the gaskets aligned.

 

[sprinter]

I find it works better if you yell at it or call it dirty names like come on you *****. Well that's how it goes in my shop anyways

hahaha...

 

[gGM Fan]

So did anyone notice a difference at all after you replaced the plugs in terms of performance, smoothness or better fuel economy?

 

[Erik G]

Yes to all. 2011 90k. I took off the metal shields, I hate those damn things. Still have the original wires and it idles smooth as a cloud

I was chasing an idle stutter. I added heat to the tank and switched gas stations. Seriously, water in the gas. I thought that was a myth...

 

[sprinter]

Eric, did you find that the used plugs did not all look the same... meaning some plugs were more fouled than others? If so, do you recall which ones? Was this the first plug change for the truck?

 

[Erik G]

Good question. Yes, all plugs looked the same. Not even a difference in the color of the threads. The color of the side of the electrodes looked good. I do believe they were original, the tips were quite worn and GM says 100k right?

For the record, I am mostly an old car guy and I do know the difference plugs make. On old cars I still use old school cheap copper NGK. No need for triple V unubtainium coated salesman crap

 

[08grey]

Just don't lean on the heater core hose. The connectors are plastic and get brittle and will snap down the road.

 

[02Lightning]

Mine ran smoother after a plug/wire change after 87k. All the plugs looked the same, and were stilled gapped at .040", looks to me they could have gone a lot longer. I went with ACDELCO wires and plugs, torqued at 11 ft. lbs.

 

[sprinter]

That's interesting that both Eric and 02Lightning had the same experience with plugs equally worn. I noticed on multiple occasions that earlier models 08-11 seem to have #1 plug much more fouled than the rest. It is a result of an early valve cover design that was then modified, I believe in 2011. Anyone else notice that?