Idle does not drop when slowing down

[Mark Red GTS Cooper]

I was wondering if any one else has experienced this. THe idle does not drop very fast, it seems to hover around the 1k, then it drops to the 500 range.

Any info would be great.

Thanks

 

[SCS]

My 2000 does the same thing....I was wondering if there was something wrong with it...

 

[JimDavis MT 97GTS 650R]

This condition is irritating but normal. As the car comes to a stop the idle should drop. (To over symplify) The delay is programmed I believe to facilitate smoother shifts and improve emissions.

 

[Ray R]

Anti miss sensor? Sounds like a double negative.
My '00 GTS (red....good choice!)does the same thing. It's normal. And you're right, it's an emmisions thing. My ZR1 does it as well.

 

[JonB]

I assume you are talking about a '2-stage' return to idle,(normal) not a constant high-idle, which would be a fault to be corrected.

The Year Matters.....kind of.

The Idle Speed motor (programable) offers a range of about 20-25 'steps' to achieve idle. When a Gen-II car lifts full-off, the idle drops in two pre-set steps, with a very annoying delay of about 2.5sec between these two steps.

The reason is to improve emissions, and cat life, and to eliminate burbling and backfiring, (that some folks actually whined about!) that occurs if you could lift off fully.

I especially find the 2-step idle a problem on track......when I want FULL LIFT NOW and not again a bit later ! When driving on track at limits, and the car lifts again , it upsets my already mediocre balance and the rear gets light!

[ I wonder if Dan Cragin, HMS, and ***** can program that OUT when re-programming the ECU for fans, skip shift, etc.? That would inspire a few more ECU sales! Lets talk!]

JonB