The HC levels are just under the limit. The inspector said from the readings it is time for a tune up. Well I know for sure my plugs shouldn't be bad because I replaced them not that long ago. Also I just recently replaced the 02 sensor, air and fuel filters. As for the coil packs and wires, they should be OK too. The wires were replaced with OEM Delco around the last tune up. That was not more than 50 or 60K ago, probably less than that though. I really don't remember what mileage was when I replaced the coils they have been replaced. The are advance auto coils. The ignition module was also replaced around 205K with one from Auto Zone.

He said something about the smell coming out of the exhaust but it'* always smelled like that :? Not that the 02 smells the same. Also I have an Actron 9190, is there something particular I should be looking at? The car runs fine :?

Here is the report, what do you think? Thanks

Delco 02 sensor. Yes the cat is original, would that effect the NO if it was bad? The engine was at normal operating temp. I drove the car for about 20min. on the highway before I got there. It took about 30mins before it was my turn so I like it run for a few while waiting. That'* how I have always done it before without issue. I know form others not to have it done on a cold engine, whether that'* ture or not I don't really know. I just always try to keep it warm.

What is this "smell" and what does it smell like?

I gotta smell it again to better describe it (my mom has it right now). As I remember it is a rich smell but not like raw fuel. I need to recheck it. My 93 Suburban also smelled the same when I owned it.

At that mileage, your biggest problem with emissions would probably be the cat being that everything else has been done.

How do you test or check it? Temperature in and out? Or do I need a muffler shop to check it? On the Park Avenue I had (93 ultra), it also had problems passing. It was failing from NO. I was told to have the cat checked. So I had it checked at the local muffler shop and they said it was bad. I paid them to replace it I also did everything else as far as tune up related items but it still failed. I then had a friend of mine that works at my local dealer look at it and he decarbonated the engine or however you call it. It passed without issue after that.

I have never heard that term "decarbonated the engine". Just exactly what did he do? Seafoam?

smell like oil on the block burning?

I imagine excess carbon buildup could cause abnormal emissions. It'd actually be an excellent thing to Seafoam the engine before having the cat replaced. Its also recommended that the plugs be changed after doing seafoam as well.