I got a look at the analyser screen when I was in for my half year vehicle inspection yesterday. 4.7 % CO, 7.2% CO2, IIRC. Didn't see the HC but presumably high (They don't give you a printout, probably the thinking is "no numbers, no pack drill").
The posted limits for a 1990 car (mines 1986 which wasn't posted) were 4.5% and >9%, so that should probably have been a fail, but the private centres tend to cut you some slack for the repeat bizniz, plus they don't wan't the extra hassle of communicating a failure to a non-Chinese speaker. It pays to be dumb sometimes.
Their meters are allegedly "tuned" to read low anyway, so it might be running even dirtier, though the plugs look OK. Spose I'd better try and tune it.
I couldn't remember the UK limits (never having failed a UK emissions test) so I checked them online
https://www.gov.uk/government/uploads/sy...7th_Edition.pdf
The CO limit is comparable (it shifted from 4.5% to 3.9% during 1986), but there is no mention of a minimum CO2 value. I suppose having one would prevent faking a test by bleeding air into the exhaust, which I've heard of but never tried.
What happens in the US?
It appears from a quick look that, in at least some US states, a car of this age might be exempt.
The posted limits for a 1990 car (mines 1986 which wasn't posted) were 4.5% and >9%, so that should probably have been a fail, but the private centres tend to cut you some slack for the repeat bizniz, plus they don't wan't the extra hassle of communicating a failure to a non-Chinese speaker. It pays to be dumb sometimes.
Their meters are allegedly "tuned" to read low anyway, so it might be running even dirtier, though the plugs look OK. Spose I'd better try and tune it.
I couldn't remember the UK limits (never having failed a UK emissions test) so I checked them online
https://www.gov.uk/government/uploads/sy...7th_Edition.pdf
The CO limit is comparable (it shifted from 4.5% to 3.9% during 1986), but there is no mention of a minimum CO2 value. I suppose having one would prevent faking a test by bleeding air into the exhaust, which I've heard of but never tried.
What happens in the US?
It appears from a quick look that, in at least some US states, a car of this age might be exempt.