RonSerling
Member
- Joined
- Mar 25, 2013
- Messages
- 87
- Reaction score
- 13
- Points
- 8
- Vehicle Year
- 1993
- Make / Model
- Ford
- Engine Type
- 4.0 V6
- Engine Size
- 4.0
- Transmission
- Manual
- 2WD / 4WD
- 4WD
- Total Lift
- ummmmm 4" could be 6 but its a TTB and the little bugger varies from time to time !! LOL
- Tire Size
- 33/12.5 15
Dirt !!! Got a vacuum gauge today !!! Plugged it in and started the truck. First thing I noticed at a high cold idle it was at about pulling about 14+HG. When I throttled up it dropped to about 7 but immediately came right back up. I did it a number of times and it did the exact same thing each time !! Then I disconnected the muffler and tried the test again with the same results !!! Gettin frustrated here !!!! Any suggestions ?? Thanks Oh by the way Snapon only charged me $18.99 for the gauge !! ??Everything you say points to clogged mufflers but. A vac guage costs less than 20 bucks at any parts store. That 20 dollar tool is the best diagnostic tool you can buy. It detects vacuum leaks, clogged exhaust, bad valves, even leaking heads. Even on the most sophisticated computer controlled engine a vac gauge is indispensable.
Hook it to a vacuum port on the manifold. Idle vacuum should be 20+hg. If you hit the throttle it should drop to near zero and snap back quick. Hold it open it should stay steady, if it builds up you have a clogged exhaust.
Get the guage...