Emissions revisited

Brett Dikeman brett at cloud9.net
Fri Dec 12 08:28:50 EST 2003

At 11:12 PM -0500 12/11/03, Paul Luevano wrote:

>I think there is something definitely wrong with the car, just need to figure
>out what. At 2500rpm, everything is ducky.  Its just at idle where the problem
>is.  The car is obviously running rich at idle.

Check all the lines to the fuel pressure regulator and the ECU; also 
find a scan tool and grab the adaptation values stored in the 
computer.  Note in the Bentley the specific conditions that have to 
be met before writing these #'s down- then use the chart to 'decode'.

>Now, any suggestions on reducing HC's at idle?  I've been told that there is a
>potentiometer in the MAF sensor that controls the idle mixture.  Anyone know
>about it and how to adjust it?

No such beast.

>I fear that this might be a result of my Stebro "High Performance" 
>cats.  But I
>really feel that this car should pass emissions even without cats.

...then use the sniffer pipe post-turbo to see what pre-cat levels are.

"They that give up essential liberty to obtain temporary
safety deserve neither liberty nor safety." - Ben Franklin

More information about the 200q20v mailing list