View Full Version : Is This Normal

08-07-2007, 06:31 PM
Okay im still fixin boost leaks. I have a tip tranny. When i put the car in park im pulling 20 HG vaccum. When i put it in drive im down around 17 or 16 HG. IS that a normal range to be in?

08-07-2007, 06:38 PM
with a chip while acc. you should be boosting 15-17

08-07-2007, 06:42 PM
i think he's talking about vacuum while at idle. my car idles at 20 in neutral, i dont know about the difference between park and drive, i would expect it to be exactly the same.

08-07-2007, 06:49 PM
yea i mean i thought it should be the same as well. Now im wondering where to start looking this week for wuts leaking or broken. Always something. Any ideas

08-07-2007, 07:03 PM
well, going from what i know the vacuum is created from the throttle body being closed and the engine sucking in air. it's entirely possible that the car just opens the throttle a very little bit to raise the idle rpms while in drive. that would make more sense than a vacuum only existing while in drive.