OT ROT etc - MOT Emissions failure

Can anyone help diagnose an emission failure on an Audi A4 1.8 1995

From the Print out.

Engine speed measurement bypassed

Limits Actual
Oil temp >80 87

Fast Idle Test
CO <0.3 1.47 Fail
HC <200 97 Pass
Lambda 0.97 - 1.03 0.991 Pass

2nd Fast Idle

CO <0.3 1.42 Fail
HC <200 163 Pass
Lambda 0.97 - 1.03 1.15 Fail

Natural Idle Test

CO <0.5 1.61 Fail


From the little I know, air leaks, lambda sensor, MAF sensor, ecu and
or cat can all effect CO readings, but would like some advice on where
to start.

Many thanks.

David

rads <[email protected]> uttered
summat worrerz funny about:
> Can anyone help diagnose an emission failure on an Audi A4 1.8 1995
>
> From the Print out.
>
> Engine speed measurement bypassed
>
> Limits Actual
> Oil temp >80 87
>
> Fast Idle Test
> CO <0.3 1.47 Fail
> HC <200 97 Pass
> Lambda 0.97 - 1.03 0.991 Pass
>
> 2nd Fast Idle
>
> CO <0.3 1.42 Fail
> HC <200 163 Pass
> Lambda 0.97 - 1.03 1.15 Fail
>
> Natural Idle Test
>
> CO <0.5 1.61 Fail
>
>
> From the little I know, air leaks, lambda sensor, MAF sensor, ecu and
> or cat can all effect CO readings, but would like some advice on where
> to start.
>
> Many thanks.
>
> David

Air filter?

Lee D

Lee_D <[email protected]> uttered summat worrerz
funny about:
> Air filter?
>
> Lee D

Then again just looked at the readings, what does the lambada measurement
tell us? Thats a fail too, If the sensor is knackered then the ECU all over
the place. Someone who knows abit more than my stab in the dark will be
along shortly

Lee D

rads wrote:

> From the little I know, air leaks, lambda sensor

Tose are my first 2 thoughts - I'd definitely be looking for air leaks
first, followed by testing the lambda sensor.

--
EMB