I had to smog my truck on Saturday and the tech told me I passed, but barely.  then he told me to check my exhaust myself next year. 

I asked him how should I do this?  he said "snap the gas and check the tail pipe for smoke".   As I was trying not to laugh, I asked the tech - what if it smokes what should I do?  He said you should definitely take it to the dealership.

 

Funny thing, my truck is completely stock, and brought it to him hot and it doesn't smoke.  I think he was concerned over my mileage.

 

So to prepare for this next time around, does anyone have a good cat from a 2nd gen 24v they want to sell?

 

oh, and don't forget to snap your gas!

Get a smarty, they have an low fueling setting that folks use to pass throttle snap smog checks.

You can even just rent one from DAP. Rent it, put it on half power mode, do the smog test, return to stock and send it back. Works real slick. On another thought, I dont know if I have ever seen a 2nd gen with a CAT on it. Did they ever come with one?

You can even just rent one from DAP. Rent it, put it on half power mode, do the smog test, return to stock and send it back. Works real slick. On another thought, I dont know if I have ever seen a 2nd gen with a CAT on it. Did they ever come with one?

Yep. Mine did and yes, they do plug up........

They do "fall" off too. I agree, use the smarty. When we had he sled pulling pickup, that thing would not smoke at all in half power mode and that pickup made 450/1200.

Cool - thanks for the suggestions. 

My 02 came with resonator and no cat. I far as I know 2nd gens did not come with cat converters

I have heard tell of the Kommiefornia trucks having them. I personally think it was just the resonator.

 

Ed

Like I said, my '96 had a cat on it and it was not a Kommifornia truck.

My '99 didn't have a kitty.................had a resonator and muffler.......................then just a straight pipe.

12 valves had cats, 24 valves didn't.

 

That's what I've heard anyway.

 

My friend's '96 had one, but he cut it off.

That might explain then.

I know the EPA has introduced new rules about testing, but has it not always been that any OBD vehicle just had a code check?

 

Like when I had to do emissions on my old mazda truck, I would have to run on a dyno and they would stick a sniffer in the exhuast to measure emissions, but when I got my 98 gmc truck, they just tested the fuel cap for vacuum and put the code reader on then I was on my way.

 

Maybe some areas do dynos, etc in combo and do it to diesels now, I dunno. I always thought a diesel just had a code check and that was it..

As I am in California, just about everything here sucks but the weather.

I thought my 97 had a cat on it, so I assumed that this one had one as well.  But this appears to be a resonator. 
 

Edited March 15, 201411 yr by Philo Beddoe

With a cat, you should see heat distortion on the unit...

jep, and I thought the cat was located further forward towards the motor.

The cat on mine was just in front of the muffler and it was 3" in and 4" out.

so glad i left the communist colony of kalifornia. my old mazda RX-8, one place told me i didn't pass, with 8000 miles on it. I drove it 1/2 block away, to another test place. it passed with flying colors.