Cat for MOT

[Adi82]

My MOT is due soon and i have a decat pipe on my 94 williams clio. Im guessing it wont pass the emissions test, can anyone confirm this? I have the cat still so i can put it back on, just a pain as most of the bolts have rusted badly.

[steveos_16valver]

leave the cat bypass on and if it fails put the cat back on as you get a free retest within 1 day

[black williams]

yes it will need the cat back on for mot mate

[Riley]

i just tried puttin myne threw mot with de-cat, not a hope lol cat back on straight threw no problems

[Rich]

hmmm i passed a spot check emissions without the cat on riley! must be different readings or something

[Riley]

tbh rich i think shes running rich, 200miles to the tank full at the mo :( sob sob.

gonna get valve clearances done hopefully that may cure it

[Rich]

if you get the readings from the emissions i'm sure someone on here can tellou straight away.

yeah valve clearances might be a good idea as she was getting a little tappy when i had her.

might be new lambda time though

[Chris H]

valve clearences? Is this a mk3 fiesta?

[stew]

LOL @ Chris!

Unless its a C or D type engine it aint "valve clearences" as they use hydraulic followers!

C or D type use rocker arms which can be adjusted!


Normally worn/defective hydraulic tappets. Mine are fooked at the moment. One of my pet hates with an engine. Will be sorted when Chris_H gets his paws on it!

[Chris H]

E and K engines and J's and a few more are manual adjustment clearences.