Hi we've got this car in for mot failed on emissions.
Idle
co 11
co2 7.4
o2 0.5
hc 930
Fast Idle
co 0.7
co2 13.8
o2 1.3
hc 340
We've have tried different map and o2 sensors but didn't improve it. When map sensor multiplug disconnected emissions improve. We've scoped most of the sensors they all seem ok o2 sensor stays at 0.7 at idle then starts switching from 0.15 to 0.8 at fast idle. Injectors are open for 6.5ms at idle and about 3ms at fast idle. we checked cam timing which was one tooth out but didn't improve it. We don't have any more ideas so any help would appreciated thanks.