nufan

Since getting my spark plugs done (and boots) I've had misfires and rough idle.
I replaced the spark plugs again, a month later. Brought the plugs to a local shop to look at as they were brown and nasty looking. The mechanic stated, "yeah, they look like ****". He wasn't sure what the brown (kinda powerish) stiff would be on them ad it went up onto the porcelain.
Hooked it up, no codes, no abnormal readings!!??

Since putting another set of plugs in (MC SP515), it still has a rough idle and will bog down at stops, worse with the AC on. This did not happen before the plug change.
Cleaned the MAFS, throttle body and new air filter last night. Seems to be doing better, but just not quite right yet.

Thoughts?
It's driving me nuts and making me nervous!

thanks

corey_lax

have you changed the fuel filter recently? Cats clogged?

nufan

Fuel filter was changed about 5K ago.
I don't know about the cats...I assume a shop would have to check that?

Eric0508

did you do the idle relearn process?

nufan

I doubt it. The shop did a clear memory thing or something.

How do I do do the idle relearn process?

nufan

don't know if it matters....I didn't unplug the battery when I changes the plugs (the second time)

Allinkdupp

Cops?

nufan

they were tested an showed no drop in voltage. I am assuming not that....and it all started with a simple plug change?!

tstone3

Did you ever solve this problem, i am experiencing the same thing now shortly after changing my plugs...

MHOWELL34

Well nasty brown as you say means 2 things to me.


If the tip is Brown. Your truck is running good! Not lean or rich and is still making your mixtures correctly.

If it's black or oil you are running rich

If it's burning white you are running lean.

That gritty brown you are talking about may be carbon buildup. I would seafoam it