Smog

[Rooster's 67]

I was a Texas certified emission repair technician here in and I am a Master certified ASE Tech with an L1 engine performance cert. I would be hesitant of replacing a cat just yet. is there a station that has emission test equipment Not necessarily an inspection station but that has a four gas analyzer that is closer? just for the ability to tune and test, without the long trip and paying for the gas, time, and test?

If you could post up the emission results And at what rpms they were tested at I will see if I can give you some pointers to avoid anymore parts to replace.
Is the test a dyno type road speed/load test or just rpm in a stall test?

You stated earlier that it had passed the sniff test but failed because of the puff of smoke correct? Then subsequently failed a sniff test at a later time?

Also what was the ambient temp at the time of the different tests?
was the truck allowed to idle or did it cool while waiting?
the key as how to tune the engine for passing the test lies in being able to interpret the readings.

PM me to get my number or send me yours if I can help, it can be much quicker over the phone to work up a plan of attack for ya, can be a lot of questions to get a good idea of whats causing the failures. Besides the fact that its California for ya.

Spencer