hanging idle

[ttocs]

I was hoping this was something that would be fixed by the tune yesterday but it is still doing it. It wants to idle at around 1800-2krpms when I am comming to a stop. It normally does settle down to about 800 rpms once I stop but when I have it in 3rd it will pull the car right along at 1800 with out my foot on the gas.

 

[g36 monkey]

Someone figure this out, because my car does the same thing, only closer to 1400 RPM (1800 if I push the clutch in while rolling) and it drives me NUTS!

 

[ivan12]

My F150 does that from time to time, I know for sure it has a vacuum leak.

 

[ttocs]

I know it is common for it to keep the rpms up a bit while rolling to support accesories like the ac/alt but mine is just under 2k rpms. It didn't do this before the hci swap.

 

[extreme_21]

I was hoping this was something that would be fixed by the tune yesterday but it is still doing it. It wants to idle at around 1800-2krpms when I am comming to a stop. It normally does settle down to about 800 rpms once I stop but when I have it in 3rd it will pull the car right along at 1800 with out my foot on the gas.

It sounds like a vacuum leak. Hanging idle with no check engines on a OBD I system, usually relates to a vacuum leak all the time with that concern. I'd vacuum pump the system and check to see if the circuit holds, if it doesn't then a smoke test through the evap system will determine were the leak is coming from. Usually the leak is from a loose fitting or cracked/melted pipe...when the car is warm and your hard on the throttle, does the engine detonate under load?? There's a few circuits for the vacuum system, not just one..if it does detonate like the previous question then your EGR circuit is the one leaking..