good engine PSI readings?

[paceo 22]

whats a good PSI reading on each cylinder on the vr6 2.8?

also if i remember from past cars, do you take the fuse out for the fuel pump and screw the PSI guage into the spark plug bore?

[russj249 2]

My compressions were roughly 150 - 180psi across all 6 cylinders.

And to do the compression test remove spark plugs, the fuel pump fuse and make sure you disconect the coil pack too.. i got zapped trying to test a spark plug lead once on my VR6 - 1st time I've ever had a bad one and lost all feeling in my fingers for half hour or so!

Also crank the engine over the same amount of times per cylinder. I normally count 5 - 6 times, or 5 or 6 seconds will probably be enough for an accurate reading.

[paceo 22]

cool what fuse is it, ive lost my black fuse cover :-(

[Gazbarber1982 3]

Fuse 18

[*P3nfold* 0]

I checked a Peter Russek Manual on VR6's and its says the below

Compression pressure (new) - 11 - 13 kg/sq.cm

Min. permissible pressure (wear limit) - 7.5 kg/sq.cm

[cabrioman 6]

or just unplug the main engine harness .....

[Goguvarra 0]

i checked mine today and they all reported around 11-12 and one was about 9 . Should I worry about that one ? Does it affect driving ?

[russj249 2]

I don't think thats a massive drop to be honest. I can't remember properly but I think that's still within the tolerances. No doubt someone on here can inform you of what the tolerances actually are.

[Goguvarra 0]

well poster above said 7.5 is the lowest acceptable limit. I was just wondering if having a difference...well makes a noticeable difference in how the engine behaves )