Hi all,
I've had my Lupo for nearly 10 years now and in nearly every year since it has failed its emissions test with high CO. Usual procedure is to replace the cat (on warranty) and it passes. Next year rinse and repeat. This year the tester told me that the CO was high but couldn't complete the test because it "couldn't maintain its natural idle". Apparently it was idling too low. HC and Lambda is fine
My questions are why is it idling low?, how can I get it to idle faster? and why does it go through cats like hot dinners?.
Things that I've done:
Replaced the oil breather 2 years ago (cleaned at every service since)
Replaced the throttle body last year (calibrated on VCDS)
Oil & Filters every year, plugs, leads and coils every other year
Car is: 2000 VW Lupo S 1.4 16v (AHW)
Thanks in advance