what should CO and hydrocarbons be at.


Had me CO2 and hydrocarbons tested today.

My car is running mega rich, CO at 7.4!!! Hydro at 1100+

What should it be at for a 190ecu with no cat?

Its running so rich that it will wash oil from bores etc. Also it spits out loads of fuel onto the back of the car out of the exhaust, does anyone elses do this?

Andy (worried)

Without a Cat it’s hard to say, but certainly not anywhere near 7%, limits are probably nearer .3% CO and 100 or so HC. It’s highly unlikely that you will get to that level without a Cat, but you may get down to 1% or so. Sounds like you MAP sensor / Lamda sensor may be rogered.


cheers. i’ll check it out