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2005-2010 Mustang GT Tech Forum

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Unread 06-08-2010   #1 (permalink)
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Talking 2006 Mustang GT low idle

After installing Steeda Underdrive Pulleys the engine idles about 650 to 700 rpm and it stops charging. Does anyone know how I can adjust the idle RPM. Thanks.
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Unread 06-08-2010   #2 (permalink)
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i believe you can adjust the rpm's with a hand held programmer, if you have one.
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Unread 06-08-2010   #3 (permalink)
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Use your tuner to bump up the idle speed.
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Unread 06-09-2010   #4 (permalink)
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Are you getting the 'check charging system' on your dash display?
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Unread 06-09-2010   #5 (permalink)
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No, It just stops charging when the idle goes below 700 rpm. All I have to do is just keep the rpm above 750 rpm.
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Unread 06-09-2010   #6 (permalink)
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Thanks guys, I guess I,m going to have to buy a tuner. Is there any way to adjust manualy.
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Unread 06-09-2010   #7 (permalink)
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Maybe you should get a CAI/tuner package. You won't pay that much more than you would just for the tuner and you can add some significant power while you are at it.
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Unread 06-09-2010   #8 (permalink)
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Quote:
Originally Posted by Yellow GT View Post
No, It just stops charging when the idle goes below 700 rpm. All I have to do is just keep the rpm above 750 rpm.
How do you know that it "stops charging"? It sounds like you might have a bad rectifier bridge in your alternator. Your alternator should charge no matter what you set the idle speed of the engine to.
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Unread 06-09-2010   #9 (permalink)
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buy a CAI and tune combo then see if that works
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Unread 06-09-2010   #10 (permalink)
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Actually at RPM's lower than 750 it starts draining the battery until I push the throttle and raise the RPM to a minimum of 750 and then the needle starts indicating a normal battery charge. And the car has a new 200 AMP alternator. So it's just a matter of raising the idle about 100 RPM. Is there anyway to adjust the idle manually.
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Unread 06-20-2010   #11 (permalink)
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Installed a diablo sports predator tune, Raised the idle and problem fixed, Thanks for the info guys. Happy Fathers Day
to all.
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