Bob_M
New Member
- Joined
- Dec 20, 2008
- Messages
- 4
- Reaction score
- 0
- Points
- 0
- Location
- Tiverton, RI
- Vehicle Year
- 2003
- Make / Model
- Ford
- Engine Size
- 3.0
- Transmission
- Automatic
2003 3.0 V6 RWD ranger, 197,000 miles.
I know there are a lot of "low vacuum" threads but I didn't find what I was looking for so:
My idle vacuum is only 7 in Hg (3.5 psi), very hard brake pedal, rough idle, CEL will flash when idling for more than 10 seconds when engine is warm and getting misfire codes. If I raise engine rpm above 1200, flashing CEL goes solid and it just holds misfire code.
Replaced a few old vacuum hoses, pulled booster hose and plugged it, no change. Booster holds force with a shop vac. Tried spraying hoses, intake manifold, throttle body, numerous vacuum connections, pulled line from the vacuum tank & plugged it (this is where I got the 7 in Hg reading from), replaced coil pack & plugs, no change.
Strange thing is is that the truck will accelerate very strong.
I'm going to try compression test next.
Anyone know what idle vacuum pressure should be?
Thanks,
Bob
I know there are a lot of "low vacuum" threads but I didn't find what I was looking for so:
My idle vacuum is only 7 in Hg (3.5 psi), very hard brake pedal, rough idle, CEL will flash when idling for more than 10 seconds when engine is warm and getting misfire codes. If I raise engine rpm above 1200, flashing CEL goes solid and it just holds misfire code.
Replaced a few old vacuum hoses, pulled booster hose and plugged it, no change. Booster holds force with a shop vac. Tried spraying hoses, intake manifold, throttle body, numerous vacuum connections, pulled line from the vacuum tank & plugged it (this is where I got the 7 in Hg reading from), replaced coil pack & plugs, no change.
Strange thing is is that the truck will accelerate very strong.
I'm going to try compression test next.
Anyone know what idle vacuum pressure should be?
Thanks,
Bob