It was 38* last night. I mowed in 50* weather.

Do you shiver when you are cold? When your motor is cold, it likes to run, so when it is idling down, the computer tells the IAC to stay open a little bit longer to help get the motor up to temperature.

 

Lol I have been mowing in the 60-100 degree range. So much grass so little time.

 

Yeah, we are going through a cold spell here. So much grass so little time is an understatement.

 

For a manual trans, the PCM isn't sure if you are shifting, (either direction) or stopping, so, it will hold the RPMs up for a bit, to help the gears mesh better. Or some such.

If blipping the throttle gets it to drop back down to a normal idle, something is binding in the throttle shaft, or one of the linkages.

Hit the throttle shaft wherever you can with some of the spray white lithium grease, and see if that doesn't help.

 

when u say throttle shaft, are you talking about the throttle cable?

 

The shaft that passes thru the throttle body, that the butterflies are screwed to. Might have to get creative to actually hit the ends though.... sensors, and linkages in the way. If you can, hit the center between throttle bores too.

 

ah okay...well next weekend, think im gonna take the whole throttle body off and clean it. When I cleaned it from the top, I got what i could, with carb cleaner that I sprayed onto Q-tips, and then wiped the shaft/ butterflies like you're talking about, but I couldn't get the underside very well. I checked for any lil carbon coated cotton ***** that may have gotten stuck in the corners, but didn't see anything. Hopefully a closer inspection with the throttle body off, will reveal something. Is it hard, or do u suggest removing the shaft/ butterflies, to clean it out completely?

Thx for the advice.

 

I think the butterflies are only held in by a couple screws.... That being said, unless you find an issue with the shaft, I would just leave it in there.

 

i was thinking when u mentioned the lithium grease, maybe where the shaft goes thru the throttle body (both ends and between bores), when I cleaned it with carb cleaner, it cleaned it too good, and now the shaft doesn't want to smoooothly turn in the throttle body (metal on metal). So maybe hittin it with a bit of grease would do the trick.

Meh...gotta wait until next weekend Gonna drive me crazy all week now, now that I have a plan of action to fix this problem.

 

That's what I was thinkin' too. Let us know how it turns out.