OK Ive been looking into why my fuel economy is low, and why my brakes have been getting worse, and Ive just tested my vacuum. Could you have a look at these figues and see what you think could be causing the low vacuum? The engine is mildly built, with a possibly stock cam, exhaust manifolds, single plane intake etc. I know the intake isnt appropriate but I havent had time to replace it. TIA.
IDLE in park with no break is ~750 rpm
Trans In park
RPM Vacuum (inches Hg)
750 9
1000 13
1500 16
2000 18-19
IDLE + Brake applied in park
RPM Vacuum
900 11
IDLE + Brake applied in drive
RPM Vacuum
950 5-6
IDLE in park with no break is ~750 rpm
Trans In park
RPM Vacuum (inches Hg)
750 9
1000 13
1500 16
2000 18-19
IDLE + Brake applied in park
RPM Vacuum
900 11
IDLE + Brake applied in drive
RPM Vacuum
950 5-6