Mot Gas Test

[ORB 227 1 Cars]

Was just wondering what the actuall bench mark is for the figures given on the MOT sniffer to denote a healthy 1.9?

 

Today mine recorded:

 

- CO = 0.15%

- HC = 534ppm

 

I know these figures are very low, so was wondering if this shows I am running lean?

 

I know a lot of adjustment is done to get the levels down to Pass a MOT but are some figures too low?

 

Does that make sense?

 

Cheers

 

ORB

 

 

PS - it failed, handbrake cable snapped on the rollers. Typical of it to let go then. Stupid car.

[dcc 855]

Those HC seem high? isnt that unspent fuel

[Miles 331 1 Cars]

HC's very high, Something wrong there, CO is low but is it a CAT Model? if not it should be around 2.5%

[Anthony 1,003]

Slightly high HC's will probably be down to the cam mentioned in his signature.

 

So long as it starts and idles well, I wouldn't worry too much about the actual CO value - some engines seem to idle much better running lean mixtures.

[pete1986 2]

Mine had a similar HC reading. 564 I think. There is a smell of petrol when it's idling.

 

I think my afm is a bit worn, im going to try one my mates got to see if that improves it. What else could resolve the problem?

[welshpug 1,657]

its a DKZ with a mild kent cam isnt it?

[ORB 227 1 Cars]

Sure is Welshpug!