what does it mean when the compression gauge reads low low high? My compression gauge is leaking air but it was reading 30, 30, 60 on the rotor closer to the firewall and 90, 90, 90 on the rotor near the front of the car. How long does my engine have to live? I have an exhaust leak that I need to fix but will that cause the rotor near the firewall to loose compression? Like I said before the gauge I have is loosing pressure so the reading should be higher.

 

How are you measuring compression? Just holding the button down? Anyway, mazda spec says the max difference between rotors should not exceed 25psi.

 

low-low-high is a bad apex seal. low-high-high is a bad side seal.

How does it idle?

Henrik
87TII

 

It idles around 1000 rpm and will jump up to 13 ish and when it is really worm up it idles pretty even, around 800rpm.

 

bump.

 

Will exhaust leak effect the rotors compression?

 

no
you lost an apex seal
the car will run probably.. but weak.. and rough
won't be long before it doesn't start at all
start planning...