https://www.instagram.com/p/BfT02gdlMnH/?taken-by=ericmossy
Instagram video posted above if you can see it.
2001 Jeep Cherokee XJ, 164K miles, auto, 4x4. Hooked up Vacuum gauge to see how healthy my motor is. When it was 1st fired up the needle would skip from 15# to 12# then back to 15#... did that for about 30 sec before it held steady at 15#. When revving the engine the needle slipped to 12# then up to ~ 17-18# steady then when throttle closed up to 20# and back to a steady 15#. I think 15# reading is lower than it should be ... what are your thoughts?
I hooked the gauge up via a T section off the side of the manifold. Previously when I checked my vacuum I just pulled the larger Brake Booster line and plugged in my vacuum gauge and the vacuum read a steady 17#'s. Could it simply be the different locations have different vacuums? I don't think so but thought I'd ask. Also when I did this previous vacuum check it was over ~40K miles back I believe... so around 2 plus years.
Instagram video posted above if you can see it.
2001 Jeep Cherokee XJ, 164K miles, auto, 4x4. Hooked up Vacuum gauge to see how healthy my motor is. When it was 1st fired up the needle would skip from 15# to 12# then back to 15#... did that for about 30 sec before it held steady at 15#. When revving the engine the needle slipped to 12# then up to ~ 17-18# steady then when throttle closed up to 20# and back to a steady 15#. I think 15# reading is lower than it should be ... what are your thoughts?
I hooked the gauge up via a T section off the side of the manifold. Previously when I checked my vacuum I just pulled the larger Brake Booster line and plugged in my vacuum gauge and the vacuum read a steady 17#'s. Could it simply be the different locations have different vacuums? I don't think so but thought I'd ask. Also when I did this previous vacuum check it was over ~40K miles back I believe... so around 2 plus years.