FYI for all you FI folks, I just passed smog check with no problem. No questions asked. I have no cats.

Makes me think my engine is fine, I have no smoke from the exhaust and it runs smooth as ever.

Hmm....

 

Really!? Maybe there is hope afterall. The registration is up on my Z a week from today. I suppose I could give it a shot before going with my alterior method. Thanks for the info Rob!

 

As long as you don't have a check engine light and all of your sensors are plugged in (not "not ready" codes), you'll pass smog. There isn't supposed to be any visual inspection anymore.

 

Oh, thats right. I have the CEL on constantly because of the leaded race gas.

 

no lights here...

 

nothing new o2's wont fix oh, and unleaded fuel.

 

If the price of new 02 sensors is less than what I have to pay the smog guy to pass it, then that could work.

 

i say just pay the smog guy - why bother?

 

If it's the rear O2's, replace them with O2 Sims, problem solved forever. If it's the front's, I'd say replace them because you need them. The ECU uses them when running in closed-loop.

 

So the only reason that you think it's blown is the bad compression check? Otherwise it's running perfect? That's odd.

 

yep, i'll have it further diagnosed next week when i have the uninstall at GT Motorsports - from what i hear, a bad piston ring will result in lots of smoke and rough idle, none of which i have.

 

Depends on which ring is bad. Each piston has a few rings. If a compression ring went bad, you'll have blow-by into the crankcase but won't burn much oil unless the oil ring also went bad.