What Should Vacuum Pressure Be In Idle?

BosnianLanos · Post by **BosnianLanos** » Sun Jul 06, 2008 3:59 am

My green car is currently pulling 16.5-17.1 inHg of pressure in the manifold in idle. I think this is causing my misfire/rough idle. So I need to know what the stock reading in idle SHOULD be. Any unit will do (KPA, PSI, etc). I don't have my red car here or else I'd compare the readings, but in my civics, it's reading about 6.5 inHg in idle. I'm thinking I have a bad vacuum hose or my intake gasket didn't seal well. Shouldn't be a tough fix, just a near-impossible find.

Thanks in advance for the help.

Daniel · Post by **Daniel** » Sun Jul 06, 2008 7:09 am

Mine is pulling 20 inHg relative to atmosphere.

Daniel

BosnianLanos · Post by **BosnianLanos** » Sun Jul 06, 2008 2:21 pm

So I guess 16 is normal...

Thanks a lot for your help man!

Rodd1s · Post by **Rodd1s** » Sun Jul 06, 2008 7:18 pm

mine reads just below 10 inHg at idle... have i connected it to the wrong vacuum tube...?