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96 Camry coupe
180 Posts
Discussion Starter · #1 ·
I just smogged my car, although it passed, but it had a very high NOx Level, almost.. almost failing. 430 is max, mine was 429

HC and CO levels were both good, lower than average listed at least. near zero at 25MPH

I smogged it in california ( bay area to be exact ) and the car was originally manufactured for florida ( so I think some emission components listed "california only" are not installed )

Well, the problem indicates engine burning too hot or pressure being too high, so
My guess for this problem:

Carbon deposite
restricted EGR
insufficent cooling
spark plug temperature too high? maybe?

However, there is one more thing, I hope some experienced mechanics out there can maybe varify for me:

I knew the mechanic who smogged my car, last time when he did my corolla ( I told him that it might not pass, but turned out it did ), he had a fan blowing in the front, this time he was busy, so he did without it. Could the fan be a problem? For insufficient cooling?

The Nox level decreased as speed increased, a.k.a 25MPH reading was lower than Idle

The car also shakes a little bit when idling ( needle doesn't jump around, just the car shakes, frequency varies alittle bit over time ). This might not even be relavent.

Thank you!

Gen 4 XLE v6
02 Toy Solara V6 MT
3,192 Posts
Idle shakes could be a result of motor mounts (or even tranny mounts) needing replacement. I really don't know how to answer your first question. I've seen people who don't do oil changes, and simple stuff like replacing oil/filter/sparks/ignition/fuel filter/o2 sensors make differences.
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