Was at my pals MOT station today and was re calibrating my lambda sensor, so I used his emissions machine to check the accuracy of the lambda.



He took one look at the screen and said that the car was idleing very lean!!!
I ask why he said that as it was virtually lambda 1 and he referred to the CO being so low!?

He said that the older emissions machines never had the lambda gauge and that pre cat cars should be around 3 on the CO.

I on the other hand was over the moon with the numbers considering that I'm running 1000cc injectors.

What do yous lot think?
The car is at idle but pick up wasn't connected

 

Any one able to tell me anything about this?

 

being at lambda on idle is fine

 

I would say your mate needs to go back to school, its not an old allegro - its a modified fuel injected car, looks to be set up very well.

 

As others have said...he should stick to...well, not sure really.

If he thinks there is a problem with a car that is running perfectly fine, then maybe he shouldnt be MOT'ing cars !

And what a load of nonsense that older pre-cat cars should be 3% CO. 1983+ they must be below 3.5% CO and 1200ppm HCC to pass the MOT test, but that certainly doesnt mean they should run at 3%