vacuum and fuel pressure specifications.

[Bookworm]

I'm having a hard time tracking these down. I'm seeing 38-44 PSI for fuel, but zip for what the vacuum should be at idle (to check for vacuum leaks)

[jolt]

Here, this link may help explain things about engine vacuum: https://www.motor.com/magazine-summary/ ... uum-gauge/

There are so many things that can effect vacuum, like altitude, camshaft timing, exhaust systems, etc... that manufactures have not listed vacuum spec's for decades now.

[joatmon]

The 03 Matrix manual (attached) says fuel pressure of 44-50 psi at idle, but I can't find anything about measuring vacuum.

[Bookworm]

Automotive engineers (and companies) drive me nuts.

It's another round of "It's a vacuum problem". "Okay, how do you know?" 'we just do'.

Determine vacuum problem: How, measure vacuum at different areas with things blocked off. What's it supposed to be? "Oh, we won't tell you. We just know".

[Bookworm]

I think I'll hook up my Mityvac to one of the vacuum lines and use that to give me some pressure readings.