'89 Audi 200 failed Emissions test

[Brett Dikeman]

On May 25, 2005, at 4:17 PM, Sonar465 at aol.com wrote:

> Just got back from the CT inspection station and I failed.  My  
> Hydro  Carbon
> limit at idle was too high.  The Limit is 220PPM and I was at   
> 324PPM.  Now at
> the 2500 RPM test the limit was once again 220PPM and I was  at  
> 82PPM.  The
> car is a 1989 200TQ with a dual knock sensor  motor.  I am  
> wondering if any of
> you guys care to take a stab and what  I might do to rectify this.   
> I bought
> the car 5 years ago with 36K on  the clock and it now has 80K on  
> the clock and
> I have not replaced the O2  sensor.  Anything else I should look  
> at?  There
> are no glairing  vacuum leaks that I can see and the car runs well.

You can't "see" vacuum leaks.  Pressurize the system.  It is the most  
reliable way to track down leaks.

Was the car thoroughly warmed up and left running before the test?   
Otherwise, older cars which have catalytic converters well downstream  
of the engine will return "false" results.  Also, older O2 sensors  
will be "slow" to respond; after 50k on turbo cars, the factory  
repair manual recommends replacing them if they're "suspect".

Other things to think about- is the crank breather hose OK, how old  
is the air filter, when was the last time you ran a bottle of  
injector cleaner, how old are the plugs/wires/cap/rotor?

Brett
PS:you've done a timing belt change, yes?
-- 
"They that give up essential liberty to obtain temporary
safety deserve neither liberty nor safety." - Ben Franklin
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