Lowering the idle with an auto - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 8 Old 10-06-2019, 08:07 PM Thread Starter
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Lowering the idle with an auto

What is the best way to lower the idle with an auto?
It idles at about 900 in park as that is where I set it for starters, but once in gear it idles around 1100.
I have not dug around yet, but I am assuming that there is an rpm adder for additional drag like AC and autos. Anybody running Pro-M with an auto and been through this already? I have a Quick4 controller and not controlling via Pro-M.


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post #2 of 8 Old 10-06-2019, 10:17 PM
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Idles at 1100 in gear and you stepping on the brake?

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post #3 of 8 Old 10-07-2019, 06:36 AM
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check the brake booster sounds like it could be a vacuum leak, check fuel corrections to see if its adding fuel.
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post #4 of 8 Old 10-07-2019, 07:45 AM
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The newest Pro M strategies don't have adders for auto trans or AC for that matter. There are separate IAC duty cycle tables for when the tranny is in gear with AC on, in gear with AC off, in neutral with AC on, and in neutral with AC off.

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post #5 of 8 Old 10-07-2019, 04:28 PM Thread Starter
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Thanks for the feedback.
Yes, 1100 in gear on the brake not moving.
I can check for a vacuum leak and look at the fuel corrections.
Do I have to be at operating temp to properly assess the fuel corrections?
I hope there is not a vacuum leak as those are always a pain.

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post #6 of 8 Old 10-07-2019, 04:30 PM Thread Starter
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How does Pro-M know it is in gear? I don’t recall any wiring between the trans and processor.

'01 GT:
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post #7 of 8 Old 10-07-2019, 07:28 PM
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Quote:
Originally Posted by 2001sleeper View Post
How does Pro-M know it is in gear? I donít recall any wiring between the trans and processor.
As far as I understand the old wiring harness and software had no provisions for trans position but with the supplemental harness and new software this is now available as well as adaptive idle control/learning
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post #8 of 8 Old Yesterday, 06:45 PM Thread Starter
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Seems that I needed to run the car longer.
I made sure the fans kicked on today and it idled around 850-950 and that is probably about as good as it will get with this cam.

I did complete the fuel injector low slope tuning and ended up having to richen the low slope. For my 30lb injectors I started at 32.73 and lowered it to 32.71 and that seemed to get me closer to 14.7, but they change a good bit when just sitting at idle. My PI corrections did not seem to have much movement and were pretty close to 1.0. It was on average pulling about 2% fuel so I would assume that is pretty good.

Coolant temp was 195-205, oil temp was at 210, trans temp was only at 130 but I did not run it a real long time.
I will start driving it longer and longer to build confidence that all is well.

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