m9431

Does anyone know what the differences are between the PZEV and the standard 2.0L engines? Looks like the PZEV car weighs about 15 lbs. more and produces a few less horsepower. What was added to the PZEV vehicle? Possibly something in the exhaust system? Any differences in the engine or tuning?

chris24

Trying to find out the same info. I think it is done by engine management and exhaust system mods. I noticed that the MPG is also less so what are we gaining. I have a Mz3 2L AT PZEV Touring Edition. One thing I noticed is that the car does not decelerate as soon as I take my foot off the gas. I have @ 1.25 sec. delay before the car wants to slow down. Most noticable when I lock the AT in 2nd in rush hour traffic and want to feather the gas and creep along. Does your PZEV do the same?

m9431

Mine has a manual transmission. I notice that MPG is significantly less than a friend's non-PZEV version of the same year (2008) and we do similar driving. Yes, the engine does seem less responsive as you note. I think that you may be correct: different computer programming (engine management) and exhaust change--this could be the added 15 pounds.

Just to mention, too, that sometimes it had some slight hesitation off the line. I wondered if this could be related to fuel, so I switched to plus instead of regular and the slight hesitation is gone.

I don't have a service manual which may explain the difference between PZEV and non-PZEV versions. Is the non-PZEV even offered anymore?

As a commuter, MPG is important to me. Seems that I cannot get higher than 32; my friend is getting 35-38.

Hope we can find out what is different...