Noticed a big improvement on throttle response and a smoother idle. I will give it a few weeks to see if my MPG improves from 10.1.

 

Was it difficult? How did you go about it?

 

Very easy. Take off the throttle body, 4 bolts holding it on, unplug the connection to it. Clean it really well with brake cleaner and Q-tipsuntil its shiny and put it back on. Before I put it back on I cleaned out the inside of the intake where the TB attaches to. I didn't spray the cleaner into it I just sprayed it out to a clean towel and wiped it down real well. Took off my CAI tube andsprayed the cleaner intoitto clean that out as well. Attached everything back and started her up. I recommend replacing your PCV valve at the same time if you havent done so allready, I did mine about 4 months ago.

 

dont they make a cleaner for your throttle body specifically....

 

I might be wrong, but i don't think my vehicle is equipped with PCV valve.

 

I haven't seen a gas engine that doesn't. Even my old '84 Ford 4.9L had one.

 

Yes, there's a specific TB cleaner, but even Chrysler says not to use it. Brake cleaner is the recommended cleaner. It's probably cheaper, too. Yes, the TB is very easy to clean and it makes a significant difference. I may clean it again when my TrueFlow intake goes in next weekend. Mine wasn't as bad as some pictures I've seen, so maybe the PO had it done. The 4.7 must have a PCV valve. I seem to recall a picture of it in the customary place (top of driver's side valve cover). I cleaned the one on my Hemi and put it back in. Will replace in the next cycle.

 

My '03 4.7 has the PCV valve attach right at the oil filler spout. Check there.

 

yea they all have a pcv valve... this weekend i might be doing some of that... anyone want a DIY for cleaning your throttle body and replacing your PCV valve for the hemi??

 

So what is it that is making all these throttle bodies so dirty?

Just think about it, it doesn't see fuel, so it can't attach dirt and grime from intake air and fuel wetted throttle body surfaces, and even if it was, the intake air is filtered at least to a "good" level, so grime shouldn't build up terribly.

To impede airflow to a noticeable butt-dyno level takes a lot of intake constriction.

Is there something I'm missing?

--Matt