Hanging idle - Ford Mustang Forums : Corral.net Mustang Forum
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post #1 of 5 Unread 05-16-2019, 10:37 PM Thread Starter
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Hanging idle

My idle hangs when coming to a stop at a light it will hang at 1500 rpm for like 3 seconds before it begins its decay. I have PRP advantage how do I adjust this so the decay rate drops faster. Makes it difficult to come to a complete
Stop without going hard on brakes


1999 Mustang GT Convertible
4.75 MMR 750se 10.5:1 CR Notched Pistons
Ported PI Heads CMS Turbo 2Cams Eddy Intake 75mm 60lb inj Twin Cobra Pumps Modified FPDM
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post #2 of 5 Unread 05-16-2019, 10:48 PM
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Is there a "dashpot decay"? I'm not familiar with SCT, but others have that under dashpot.....


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post #3 of 5 Unread 05-17-2019, 04:58 AM Thread Starter
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Ya there is.. Do I raise it or lower it to get the rpm to drop faster?

1999 Mustang GT Convertible
4.75 MMR 750se 10.5:1 CR Notched Pistons
Ported PI Heads CMS Turbo 2Cams Eddy Intake 75mm 60lb inj Twin Cobra Pumps Modified FPDM
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post #4 of 5 Unread 05-17-2019, 09:09 AM
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does it not have on screen help?

there is also on line courses

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #5 of 5 Unread 05-17-2019, 11:38 AM
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If I had to guess, increase decay rate. But not knowing how the software is set up, I don't know.

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