mart360

Just seen a few cars on ebay, with failed emissions... the cars are diesels..

how exactly does it fail emmissions?? i know they do a visible smoke test, how stringent is that, and whats the pass fail criteria..

i know also some diesels have cats, but these are for soot removal?? how do these work, do they have a lambda sensor?

i have noticed that my oiler pops out some smoke under hard accelleration, but normally only if i boot it in top gear from an low speed, and once it has done it once it stays clear for some time if i do it again

why ??

Mart

BOB.T

For the MOT test, you ram a gizmo up the exhaust, bounce the engine off the govenor a few times and the gizmo measures the opacity of the exhaust fumes. If they're too dense it indicate the engine is running rich etc and it fails. There's not to much to adjust so usually an oil and filter change, air and fuel filter change combined with injector cleaner flush and a good rant up the by pass in 2nd gear does the trick!

It's actually more inviolved than that but you get the drift don't you?

GC8

And failing that, half a gallon of petrol will cause it to run hot enough to pass.....