96 GTS FAILED SMOG TEST

[Gavin]

Passed all items except hydrocarbons at idle - 100 units permitted - measured 446 units.
Potential causes as described by smog mechanic:
Bad plug wires
Air leak
Bad Catalytic converter
Bad O2 sensor.

Plug wires were new about a year ago - stock viper part
Intake manifold gasket replaced two years ago (warranty) car idles perfect.
One O2 sensor replaced under warranty - I guess this leaves three others that could be bad?

Any other ideas as to the cause
Thanks
Gavin

 

[99 R/T 10]

Remove the cats! Ya never know.

Mike

 

[striker79]

This may sound stupid but did you drive it around to let it warm up.Other than that unless you added a adjustable fuel regulator check your plugs and wire's possible fuel filter clogged or air cleaner.

 

[Gavin]

Thanks guys
Will pull plugs, air and fuel filters - I know the K&N air filter is due for a good cleaning.
Will post outcome as I know someone else is going to run into this too!

 

[Dion Fisher]

Gavin,
I just had to replace both forward O2 sensors on my '96 the left was shot and the right was just about flatlined.. Check them out!