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View Full Version : What vacuum should I be drawing at idle?



sts70004
05-02-2009, 02:52 AM
I honestly have no idea, and I'm drawing about 17 in hg on my vac/boost gauge. Is that about right? Runs rough on idle so I thought I'd check for a vacuum leak.

sts70004
05-02-2009, 02:56 AM
oh i just saw it on another thread. I have been searching with the wrong terms I guess but I figured it out. 20 inches right?

thunderkid84
05-02-2009, 03:43 AM
auto or manual ?

sts70004
05-04-2009, 01:11 AM
Manual transmission, they are different?

thunderkid84
05-04-2009, 07:20 AM
Manual transmission, they are different?

yea a little bit.

u should be pulling between 18-20 at idle

sts70004
05-06-2009, 02:24 AM
I'm pulling 15 in hg. So I might have a small vacuum leak then. I have a somewhat rough idle. I've replaced Oxygen sensors, cleaned the MAF, and that really smoothed it out, but its still a little rough. Vacuum Leak a likely culprit?

thunderkid84
05-06-2009, 07:05 AM
most likely yes. check the normal spots and also the IC tube, they like to leak there alot.