1984 Fiero failed Aircare

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   Hello, 

I took my Fiero to the Aircare center today, and it passed all tests confidently but one: Oxides of Nitrogen (NOx) ppm. The maximum allowable is 2438 and my reading came to be 2714 -- the average passing reading is 712.50. 

The only thing I did before the Aircare test was I filled up on some Shell gas -- like 5 minutes before -- I always fill it up with Chevron but today was different since I had a quarter tank of gas. 

I asked around and learned that the major culprit here may be the Catalytic Converter, but I wanted to gather your opinions and guesses on what the problem may be! 

Thank you! 

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InfernoFiero Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 25 June 2011 Location: Canada Status: Offline Points: 133	Post Options Post Reply Quote InfernoFiero Report Post Quote Reply Topic: 1984 Fiero failed Aircare Posted: 09 May 2013 at 2:52pm
	Hello, I took my Fiero to the Aircare center today, and it passed all tests confidently but one: Oxides of Nitrogen (NOx) ppm. The maximum allowable is 2438 and my reading came to be 2714 -- the average passing reading is 712.50. The only thing I did before the Aircare test was I filled up on some Shell gas -- like 5 minutes before -- I always fill it up with Chevron but today was different since I had a quarter tank of gas. I asked around and learned that the major culprit here may be the Catalytic Converter, but I wanted to gather your opinions and guesses on what the problem may be! Thank you!

Rob N. Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 02 March 2008 Location: Canada Status: Offline Points: 138	Post Options Post Reply Quote Rob N. Report Post Quote Reply Posted: 09 May 2013 at 3:20pm
	Try changeing the O2 sensor... fixed my 4 cyl & 6 cyl

Colby Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 30 March 2009 Location: Abbotsford/Sask Status: Offline Points: 665	Post Options Post Reply Quote Colby Report Post Quote Reply Posted: 09 May 2013 at 5:36pm
	A malfunctioning EGR valve can cause a higher NOx reading.
	88 Formula 5 speed

beken Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 12 February 2007 Location: Canada Status: Offline Points: 1464	Post Options Post Reply Quote beken Report Post Quote Reply Posted: 09 May 2013 at 9:11pm
	It wouldn't be the catalytic converter. My car has never failed on NOx. I'm pretty sure the cat isn't working on my car.
	Beken (aka Ken) - bekentech@westcoastfieros.com Original and still the owner of an 85SE 2M6 4spd

Patrick Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 19 April 2008 Location: Vancouver Status: Offline Points: 5	Post Options Post Reply Quote Patrick Report Post Quote Reply Posted: 09 May 2013 at 11:24pm
	Check your ignition timing. Perhaps it's too far advanced.