Join Date: Mar 2008
Location: Philadelphia Burbs
I'm no expert, but I would venture to say that those are normal deposits as found on an engine w/ 42k on the clock.
Periodic use of Techron may help reduce/eliminate that. Maybe try a deep seafoam treatment to get rid of the accumulation, then run Techron for a tank or two. After 5k, another dose of Techron, then maybe every 10k.
It would probably clean off those valves, but I kinda doubt you'll be in the mood to pull off the throttle bodies again anytime soon to confirm it!
I'm sure someone more knowledgeable will chime in soon. Anyhow, good luck!
PS: good pics, by the way!
DonStrom6 - PHL
DL1000K5 - Black
DL650K8 - Yellow (Sold)