GregGA
87 Laredo Galloping Ghost
- Location
- Woodstock GA
I have had a vacuum gauge installed for a long time in my Jeep. I mainly use it get better mileage, kind of like a reverse tach
.
When I recently installed my transmission cooler, I pulled the front bumper, and also disconnected the vacuum lines to the "football". So happens my wife's Honda was in the shop, and I had to take her to work. My MAP vacuum line no longer runs from my Leigh throttle body, but from the line off the intake manifold (which then goes to the football).
I new there would be some effect with the unplugged lines: rougher idle at start up, but off I went. Picked her up that night, and took her to get the car the next day.
My vacuum normally reads about 15 at idle. With the lines off, about 10" hg.
Now here's the point of all this: driving about 35 miles with a vacuum leak to the MAP dropped my mileage from about 15-16 mpg to a crappy 10.2 mpg. It was very enlightening and I'm glad I had the vacuum gauge so I didn't wig out about the mileage drop.
.When I recently installed my transmission cooler, I pulled the front bumper, and also disconnected the vacuum lines to the "football". So happens my wife's Honda was in the shop, and I had to take her to work. My MAP vacuum line no longer runs from my Leigh throttle body, but from the line off the intake manifold (which then goes to the football).
I new there would be some effect with the unplugged lines: rougher idle at start up, but off I went. Picked her up that night, and took her to get the car the next day.
My vacuum normally reads about 15 at idle. With the lines off, about 10" hg.
Now here's the point of all this: driving about 35 miles with a vacuum leak to the MAP dropped my mileage from about 15-16 mpg to a crappy 10.2 mpg. It was very enlightening and I'm glad I had the vacuum gauge so I didn't wig out about the mileage drop.
