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Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 10-11-2011, 09:25 AM   #11
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when you apply the brakes..your vacuum booster uses vacuum. This is also normal.

Everyone start their car and apply the brakes, then hold them. Hear the engine change?
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Old 10-11-2011, 12:26 PM   #12
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Originally Posted by BillBoost37 View Post
RPM drops, which slows the alternator and the voltage dropping is more common the cars.

This is because at 500-600 the pcm turns off the field of power to keep the alternator producing.

The best way to bump idle is through the pcm. However there is a set screw on the side of your TB that could be used to do this as well.

When I come to a stop, my idle drops to around 500 RPM and then my voltage goes down.

I'm going to see if I can get a friend of mine do the sense wire mod for me. I also want to raise the idle as well. Thank you Bill


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when you apply the brakes..your vacuum booster uses vacuum. This is also normal.

Everyone start their car and apply the brakes, then hold them. Hear the engine change?
I don't understand why the voltage drops though when I hit the brakes. It seems strange. I've never seen any cars do it. I looked it up and some other people have had that problem in other cars. Do you have any idea what it could be? As soon as I let off of the brakes, the voltage rises. And when I put her in neutral, it rises as well.
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Old 10-11-2011, 10:44 PM   #13
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Hey Dan. In your tutorial, you give a link to the part. After I clicked it, the link doesn't bring me to where I need it to. lol. You said plug, but I don't know which plug. When I go to Rock, what should I look up? Pontiac? And what year? Sorry to be a burden. I got a few of my friends to help me with this.
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Old 10-11-2011, 11:07 PM   #14
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Go to rockauto, click on search part number, then type in S552 and it will bring up that part.
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Old 10-12-2011, 01:45 AM   #15
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Go to rockauto, click on search part number, then type in S552 and it will bring up that part.
thank you sir. Much appreciated it.
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