I've been having a problem where my car seems to want to hang a little in RPM between shifts, and when blipping the thottle when idling.

Results:
First, the throttle response is MUCH better, and the little blips to the engine now have the RPM's dropping back down very fast. Great! I also didn't get any hint of an exhaust pop when reving the engine, even though it was cold. This is the first time in a long while that it hasn't done that. I just thought it was from being cold. It will probably still do it once in a while, but it used to do it for sure with the type of quick revving I did after the TB cleanup.

:edit: Thanks Shoebox for the gasket set part# and the throttle body exploded view. It helped a lot.

Procedure:
I decided to take the throttle body off and clean it well, along with the IAC. I bought the two piece gasket set, which is essential in my opinion. When you take the bottom portion off the throttle body to get to the IAC passages, the stock gasket gets destroyed.

Anyways, I used seafoam deep creep on the entire thing. I couldn't believe how much buildup there was in the area behind the blades. The backside of the blades and the ports behind were caked pretty good. Took an old toothbrush to work and got it cleaned well.

I cleaned the IAC with the deep creep too, making sure not to let any seep down into the back portion of the IAC, and making sure not to move the piston.

Then I took brake cleaner ONLY on the IAC passages and IAC head. I didn't want to remove any coating that may be on the blades.

Scraped the old gasket material off the bottom portions of the throttle body, and buttoned everything back up.

I wonder if this could be tied to my drivers side O2 slow response code that I've been getting. The O2's are brand new, so it's tied to something else (not the O2's). Hopefully this solves that too. Could it have make the car run too lean? My milage is good, so I'm pretty sure it's not running rich. I think the slow response is(or was) from a constant lean condition. Could the TB and IAC cause that?

Sorry for the long post.

Dan

 

I did that a little while ago too. made my idle lower and smoother