91 Accord emissions failed inspection please help
 

I went to NJ inspection today and failed for emissions testing - I had
just changed the plugs- wires- cap and rotor - pcv valve -air filter -
and a fresh oil change - here are the readings :

NOx STANDARD 1045 READING 2196 FAIL
HC STANDARD 136 READING 111 PASS
CO% STANDARD 0.76 READING 1.19 FAIL
CO% READING 12.5
O% READING 1.5

Hope that someone can help me identify the problem ( s)
Thank You

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Re: 91 Accord emissions failed inspection please help
 

pwman2002 <none@000.com> wrote in news:1209873_
33496d34b88d894f63524e1b0b5ec2ab@autoboardz.com:

> I went to NJ inspection today and failed for emissions testing - I had
> just changed the plugs- wires- cap and rotor - pcv valve -air filter -
> and a fresh oil change - here are the readings :
>
> NOx STANDARD 1045 READING 2196 FAIL
> HC STANDARD 136 READING 111 PASS
> CO% STANDARD 0.76 READING 1.19 FAIL
> CO% READING 12.5
> O% READING 1.5
>
> Hope that someone can help me identify the problem ( s)
> Thank You
>


What was the car like during previous tests?

Your readings are pretty high across the board, except for CO2, which is
really low.

How hot was the converter during the test? How far had the car been driven
prior to parking it for the test? How long did it sit? Did they let it idle
in line while waiting? When measuring the cat with an infrared thermometer,
is there about 100deg difference between inlet and outlet? (outlet being
the hotter). Is this an aftermarket cat?

Has the ignition timing been checked with a timing light to make sure it's
not excessively advanced?

Check the EGR system for carbon buildup in the runners that would prevent
some cylinders from receiving EGR.

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Tegger

The Unofficial Honda/Acura FAQ
www.tegger.com/hondafaq/