High Compression??

[mthaynes]

I have been trying to figure out why my 87 325 idles like a race car, and lacks power below 3K RPM since I bought it a year ago. I have replaced all the normal stuff: plugs, cap, rotor, wires, coil, all vacuum lines, both fuel pumps and filter, FPR, ICV, ICV module, cleaned injectors with new o-rings to no avail. Valves have been adjusted several times with little change and the AFM circuit board has been cleaned but the poor running/idle continues. So, today I did a vacuum and compression check. Vacuum was 19-21" at idle and smooth and rising at higher revs. Compression, 1-6 as follows: 120/155/160/120/170/190psig. These results are a little unnerving. Low I could understand, but way high??
Anyways, I see a rebuilt head in my future.
What do you guys think?

[Fendego]

you have some serious issues mang. 60 psi difference between cylinders is critical lol

[whodwho]

You cranked it over the same number of revs and held the throttle open when cranking?

You don't necessarily worry about how high or low just the differences.

[Adrian_Visser]

do a leakdown test or at least squirt some oil in through the plug holes to make sure it isnt the rings that are leaking. as for the high reading on number 6 proly carbon build-up i would say