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boost guage needle postion 89T 700

posted by  Azureblue on  Thu Feb 3 07:35 CST 2005
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I disagree: When the car is warming up, the idle speed control motor will raise the idle speed to 1000RPMs or a bit more, and allow in more air, and will raise the idle speed to 1000RPMs when the A/C is on. The vacuum changes can be seen on the vac / boost guage along with the RPM changes. At decel, the vac / boost guage drops almost to the peg, then the idle speed control motor will bring the idle RPMs back up to 750.
Do I need to disable this thing before I go hunting for a vac leak?






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