My No came back extremely high everything else passed, well for the exception of my gas cap. The No was 1667 and the norm was 772 where should i start to find the problem? I havent ran it in some time been away in the war need some assistance to bring her back up? 89 iroc in california/ yeah california.

Where you at in Cali? Im planning to pay a lil something something to get mine passed as some as I get my 86 IROC running right. I have no cat. My friend has connects to smog cheaters.

check your diverter valves. They may not be switching the airflow to the exaust headers/ catalytic converter when theyre suppose to. You may also want to run your Camaro a bit hard before visiting the smog shop so that you can get your cat up to normal operationg temperature.

nox is what i think you mean,that is a byproduct of high combustion chamber temp.im assuming your emissions controls are still on the car. causes are usually egr vacum hoses disconnected,egr passages clogged,overadvanced ignition timing,bad catalyst.it would help to know all the readings.

I will take that into cosideration thanks, I want to get my car back to to the shape it was a year ago when it passed so this is my new weekend trip. ill figure it out but if i give up ill look you up. thanks again.

Im gonna try to clean the EGR and go from there...thanks

So where do you live? I live in the Imperial Valley.

if the converter is original ,its also long overdue to be replaced. those are the biggest causes of high nox............egr,timing,bad cat.

good luck

Hooyah, if your going to replace the cat, the only CA. legal ones are sold by Magnaflow. Unless you want to get the cheap Autozone ones. The cheapest on that I found was at CarQuest. They have the 3 inch 3 way cat which is about $125. The Magnaflow one will cost $200+. A new law had just passed this year on the 1st of Jan. So even if you go to a junkyard and find a Camaro with CA plates, it would still be illegal for the junkyard sell you the cat. In other words, you have to buy a new one, unless you stop someone before they enter the junkyard and offer up some cold hard cash for theyre cat.

Funny you mention the junk yard that was where i was heading tomorrow, i have a hook up there and will be hunting for a parts that can put me over the line so to speak. I have a exhaust smell entering the car when its on and i think it is due to a break in the exhaust manifold? my friend is a gear head and both he and i will be scrapping up the junk yard hit me up if you need any parts?

. Yes Sir. I need a pair of IROC hood louvers. If you find any, how much would you sell em to me if you find a pair?

I'm on it, if i find any ill let you know tomorrow.