I’ve been noticing how rough the idle at stop lights, signs, etc... is - after doing some research found that rough idle in drive is sort of a thing with these beasts. Decided I would do several things to try and smooth it out:
-Clean MAF
-Clean air intake
-Check ignition coils
-Check/replace spark plugs
-Clean battery terminals/disconnect for 20m+
Ended up doing all of those things. Amazing idle now. Even my wife, who sort of grudgingly admits “the monster” is a pretty rad car, mentioned that she noticed it was idling smoothly. We cranked some music up for the girls - just a little bit - and I couldn’t even tell that the engine was running. Really amazing difference.
I’ve never done any of that work before. Well, I guess I’ve changed spark plugs before. But really appreciated all of the guides on how to do these things - I guess the MAF cleaner was pretty easy to follow the directions on the can, but its good to have the collective wisdom of ih8mud there anyways.
Also changed the with another round of high mileage synthetic Mobil1 and greased the all the zerks down below.
Posting some pics of the spark plugs that I pulled and the coils after I wiped them down. My initial assessment of the coils was that they looked like they were in good shape. All of the rubber boots were flexible, no cracks or deformations. Curious if any of you see something I missed.
With the plugs, I really couldn’t tell if they needed replacement or not. I don’t have a lot of experience. New plugs were a little pricy but not as much as eight new coils. Some looked dirty (Left #1 had oil all over the threads - probably loose?) but none looked really thrashed. I replaced them anyways, tightened them down (most had seemed a little loose), put it all back together.