Virtually all the threads I've found have either failed everything miserably or failed CO by fairly big numbers (10%, not 0.something). I can read the emissions print out and search for similar threads but I'd like to know what failing particular aspects can mean.
Anyway, what are the symptoms of passing HC, but failing CO?
Fast idle:
CO 0.85% (Fail > 0.30%)
HC 53 PPM (Passed)
Lambda 1.04 (Fail 0.97 to 1.03)
(Virtually identical numbers for both fast idle tests)
Slow idle:
CO 0.91% (Fail > 0.50%)
More info:
* Lambda sensors are OK. Both OEM, pre-cat is recent & they have been swapped around to test.
* New plugs, oil, oil filter etc within last few months
* It does do short journeys, sit in traffic and the last owner lived in London (so wouldn't surprise me if the catalytic converter is fubared) but without fail it is be warmed up and enjoyed once a week.
* MOT was done 2 hours after I dropped it off, oil temp was 89 degrees C & tester said he held it at high revs for a few minutes before the second test.
* Engine doesn't burn oil or destroy spark plugs
* For what it's worth (IMO a lot, actually) the tester also gave a good impression. Knew about complexity of F4R cambelts, asked if I'd heard of CS.net, spent ages discussing the failures, did a few bits for free (number plate bulb, tracking)
Will probably stick a cheap non-OEM or borrowed OEM catalytic converter on it and retest, but wanted to see if anyone else had similar results (easy HC pass, bad but not ridiculous CO)
Thanks in advance
Anyway, what are the symptoms of passing HC, but failing CO?
Fast idle:
CO 0.85% (Fail > 0.30%)
HC 53 PPM (Passed)
Lambda 1.04 (Fail 0.97 to 1.03)
(Virtually identical numbers for both fast idle tests)
Slow idle:
CO 0.91% (Fail > 0.50%)
More info:
* Lambda sensors are OK. Both OEM, pre-cat is recent & they have been swapped around to test.
* New plugs, oil, oil filter etc within last few months
* It does do short journeys, sit in traffic and the last owner lived in London (so wouldn't surprise me if the catalytic converter is fubared) but without fail it is be warmed up and enjoyed once a week.
* MOT was done 2 hours after I dropped it off, oil temp was 89 degrees C & tester said he held it at high revs for a few minutes before the second test.
* Engine doesn't burn oil or destroy spark plugs
* For what it's worth (IMO a lot, actually) the tester also gave a good impression. Knew about complexity of F4R cambelts, asked if I'd heard of CS.net, spent ages discussing the failures, did a few bits for free (number plate bulb, tracking)
Will probably stick a cheap non-OEM or borrowed OEM catalytic converter on it and retest, but wanted to see if anyone else had similar results (easy HC pass, bad but not ridiculous CO)
Thanks in advance
