col.mondeo

My Mk2 2001,1.8 mondeo has jst failed its m.o.t on high emission levels, Any ideas anyone? Cheers

chaffe

you will need to be more specific, hydrocarbons,lambda or co? At high or low rpm test

col.mondeo

2500-3000 rpm

CO at 5.90%
HC at 1190ppm
Lamba at 0.806

Any ideas?

Thanks

Farmer Giles

was the cat nice and warm before it was tested, not just ticked over for a few mins at the garage ?

My old Mondeo used to stuggle a bit with emissions until I started giving the car a good old thrashing on the way to the MOT station. Still do it today, a couple of runs up and down the local bypass before pulling in.

HTH

col.mondeo

No the car had not bin run propaply for about a week before the m.o.t, and i have never taned the car since av had it, It passed on evreything else! Not even a advisory! Sods law! Bin told it could be a number of things!
Not my day at all!

ECU Monitor Enthusiast

iTrader: (1)

The MOT test has to ensure the car is up to working temperature before taking the emmsions test.

As the CO is that high, I would guess that there is an engine managment issue.
Is the engine warning light on and have you had a code read done ?

col.mondeo

Thers no light on, I have got it booked in for diognostics first thing tomoz, any ideas what could be causing it? Am hoping its a recent proplem because if never noticed it smoking meself.

B19 JUB

id say cat is knackered tbh.mk2 mondeos and mk6 escorts were prone for them in my experience

JonathanJ

I would say more likely to be Lamda sensor gone , even if Cat has gone you would not expect the reading on the MOT emmisions to be showing a 0.806 as the onboard one would always try and get it as near to 1 as possible , it is more likely not reading correctly ( on the weak side ) so it is richening mixture up and hence the high CO and HC readings , just my thoughts

phil_focus

Exactly what i was thinking!!

tabetha

I think the same as jonathanj, although the mot test has to ensure the engine is up to temp, some cats, esp aftermarket cats can cool so quickly they stop working effectively enough after idling for a few mins, on cars that are already a bit coked up, bloody good thrash on way to mot test is best bet ime.
My astra always without fail, fails on the idle emissions but always without fail passes on fast idle, that's fairly std for astras so I'm told on mk3's.
tabetha

richard youll

regardless of engine temp during the emmision test the lambda reading will is within limits as they are heated sensors, usually low lambda reading 80% of the time is just a tossed lambda sensor and causes over fueling, and in turn high hc's but diag will show this. may not come up with a trouble code but it switching can be checked easily. even a faulty ect sensor would cause this too and maf

chaffe

Not a warm cat problem with co that high IMO
I agree, missfire or gubbed lambda sensor/coolant temp sensor etc
So why is the co at 5%? a non cat car should be half that!
Yep, lambda or another ecu related fault (coolant temp/missfire)
Im sure you would agree that the lambda should still be 1 and the co much lower, even if the cat was not working?
What was the idle emmisions? If it passed at idle then its not the cat is it

col.mondeo

Had it at the garage ysterday for scanning and both lamba sensors and cat seem 2 be in order?, put sum stp in fuel an give it a pasting up the motorway and it seems 2 have cleared it out but seem 2 still have a slight bit of smoke?? The car runs like an absolute dream tho.

chaffe

maybe you have a valve stem seal issue or piston ring problem, or even an egr fault. The simple fact is no one on here can properly diagnose your problem without seeing the car