71-3.0-911

So, good news here in Colorado. Even though emissions tests are required on every 1984 and newer vehicle, they no longer verify readiness codes on vehicles older than 12 years. They just do the rolling tailpipe test. Here are the results from my car. Tested at idle, and up to 25mph in second gear. Are my numbers high for a 111k mile car? They are WAY below the limits. Are our limits high? Anything to be gleaned here from the data?

-Scott

pp000830

It can be gleaned that you drive an Ultra-Low emissions vehicle. Be sure to pull up to the next Prius you see and tell the driver so, and discuss what he is missing by not driving a car like yours.

71-3.0-911

Thanks for the humor Andy. I was hoping that someone would know if any of the numbers could help infer anything about engine health. I bought the car with 96k miles and no records. Trying to see what time I may have before I need to do a rebuild and upgrade to 3.8. May be too much to hope for. I was thinking with such low HC numbers that at least I'm not burning much oil...

-Scott

IainM

The fact that 99% of what’s coming out the tailpipe is CO2 is good and consistent with what I see on mine. Really all you can tell is that the CAT is still working.
add the fact that there’s no codes and the car pulls strong then I think you can deduce that your engine is in tiptop condition.

71-3.0-911

Thanks, Ian! Appreciate the help.

-Scott

FLYT993

i rebuilt my 3.6 to 3.8 at 168k. it was "tired" at that point and pretty serious leak at case bolts so i was going to have to split the case to fix..."while you're in there"....didn't make sense to rebuild back to stock when the labor was about the same.

pp000830

H Scott,
What makes you think you need a rebuild? Some 993 are breaking the 200K miles barrier with no need for internal engine work. Be very suspicious if a technician starts taking top-end or any other sort of rebuild.
Oil leaks or a puff of blue smoke is not an indication of problems on these cars nor is it a basis of a rebuild decision. The leak-down dog and money show some mechanics do have proven to not be a reliable indication of the need for internal engine work.
If your desire is for significantly more power the best bet may be an aftermarket supercharger, a bolt-on solution that seems to not cause durability issues and is completely reversible.
Andy

71-3.0-911

I don't think I need a rebuild at all. I was hoping I could glean something, if anything about the engines health. That's it.

HalfGerman

I thought you were looking for an "excuse" to go 3.8.

71-3.0-911

I like this idea but I think I've got a number of years to go.