vacuum compression test

[brent]

Suspected some kind of vacuum loss to explain my 5.9's sluggisheness, and I think I confirmed it.
My trusy Haynes tells me I should be pulling a healthy 17-22hg's and I'm pulling a steady 13-14.
The 13-14 is solid, with no fluctuations or drops or spikes.
Haynes narrows this particular reading down to intake manifold gaskets or ignition timing.
What do y'all think?
Thanks, Brent

[oddfire]

Try advancing your timing while the guage is hooked up. I bet that brings it up. You will also have to readjust your idle speed and mixture........phil

[grimgaunt]

whats the altitude at Tempe ?

[oddfire]

yea forgot that part. add 1"HG per 1000ft above sea level.I pull a steady 15 but at 6000ft + that would be 21" hg................phil

[ March 01, 2003, 05:37 PM: Message edited by: oddfire ]

[brent]

Phoenix (Tempe) is roughly 2000 ft above sea level.
So the 13/14 changes to 15/16.
Still below optimal.
I will try to advance my timing tomorrow when it's sunny.
gra-cias