wcc_71

i did a compression test o3vz-e and on one cylinder it came back 45PSI where it was supposed to be 171 so any suggestions to what it might be causing this

91Toyota

head? Maybe sludge in the rings? Or shot rings...???

toytech76

burnt exhaust valve. They burn valves regularly

91Toyota

You should always keep a spare valve on hand so when your driving and burn one you can simply replace it!

toytech76

I hope to hell you're joking....

CW

Did you squirt some oil down the weak cylinder and retest it?
If compression increases significantly then its rings.

91Toyota

Yeah...I am a jokester...lol

thook

Yeah, get ya some of them quick disco valves. Greatest thing since butter patties!

One cylinder being low like that it's more likely to be an exhaust valve. Bad rings don't tend to run low readings like that unless you have some major damage....which you would really notice. Major bad noise. Plus, ring wear isn't typically isolated to one cylinder. But, run the oil test for sure. Easy enough.

toytech76

rarely do you ever see rings go bad like that in a 3.0. We do so many valve jobs its not even funny. I can do those things blindfolded. lol If you do a valve job..make sure and do it right. Nothing half ass

thook

Probably lack of regular valve adjustments? Finicky little buggers, the 3.0.

toytech76

yah, i think thats a big part of the problem. We charge about $400 to adj them and im sure the dealer charges even more. I can see why alot of people are turned off on wanting to do it. Better $400 then $2800

thook

I totally agree.