Idle RPM drop when electrical accessories engaged - Ford Mustang Forum
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post #1 of 2 (permalink) Old 11-11-2016 Thread Starter
AdamCali65's Avatar
Joined: Mar 2013
Location: Encino
Posts: 143
Idle RPM drop when electrical accessories engaged

Hi all,

Recently I have been noticing an RPM drop whenever I open a circuit on an electrical component. For instance, whenever my power windows engage, I feel a significant RPM drop. When I press the brake pedal just enough to engage the tail lights, I get an RPM drop.

Randomly, when I am idling at a light or idling in a stationary position I get an RPM drop, I presume sometimes when the electric fan comes on, other times I am unsure. The RPM drop is from the standard 750 to about 500 rpm and the car really vibrates, just like a stall is about to happen.

I am curious as to whether this is an alternator/alternator voltage regulator issue or a TPS or IAC issue. I wanted to get other opinions on the matter, so I am looking forward to responses.


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post #2 of 2 (permalink) Old 11-12-2016
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Joined: Aug 2011
Posts: 5,752
Idle RPM drop when electrical accessories engaged

Idle tensioner I bet.
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alternator , electrical , issue , power accessories , rpm drop

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