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Emissions failure ( non cat ) any ideas please ?
Mog72 - 5/6/15 at 10:48 AM

Took my 2007 Westfield for an mot earlier, failed on bloody emissions
It's a 2.0 silvertop zetec, 285 cams, head has been ported, jenvey throttle bodies, omex 600, non cat
Recent new plugs & new piper cross air filter
It failed at ..Co 4.68 % ( limit 3.5)
It passed on hydrocarbons ..120 ppm ( limit 1200 )

Ive bought a Forte fuel additive & intend to drive it a bit harder the next few days to try & clear it out maybe
Does anyone have any other ideas ?
Thanks in advance

kingster996 - 5/6/15 at 11:00 AM

I read somewhere that you can reduce the fuel pressure slightly and this will help - but maybe someone more knowledgable will come along to confirm this!

PS - thought you'd sold it

[Edited on 5/6/15 by kingster996]

Mog72 - 5/6/15 at 11:16 AM

quote:
Originally posted by kingster996
I read somewhere that you can reduce the fuel pressure slightly and this will help - but maybe someone more knowledgable will come along to confirm this!

PS - thought you'd sold it

[Edited on 5/6/15 by kingster996]


Yep, I've sold it, taken a large deposit on it, said I would put 12 months mot on it though 😏

Dick - 5/6/15 at 11:33 AM

Turn tickover up so its at the max that is allowed for test (its 1200 rpm) that normally works for us

adithorp - 5/6/15 at 01:01 PM

If it's on TB's and OMEX can't you just weaken the mixture at idle.

4.7%CO is very rich at idle especially with injection. Even with carbs1-1.5% should be possible.

CosKev3 - 5/6/15 at 03:51 PM

Either as above, crap mapping or if it has a coolant temp sensor that could have failed?

britishtrident - 5/6/15 at 07:48 PM

Is a thermostat fitted ?

Mog72 - 5/6/15 at 07:58 PM

quote:
Originally posted by adithorp
If it's on TB's and OMEX can't you just weaken the mixture at idle.

4.7%CO is very rich at idle especially with injection. Even with carbs1-1.5% should be possible.


If it's running on omex wouldn't it need to be connected to a laptop to adjust the mixture at idle ?

motorcycle_mayhem - 5/6/15 at 08:43 PM

This engine in my old Mundaneo was a real pig to get through the CO percentile, and that was with all the standard kit, functioning correctly. Apparently, this is not unusual, the reason Ford dispensed with it with the (then) new Euro regs.
Constant MoT issues, only helped by a very patient examiner, it's the reason the car was scrapped.

My 2002 Megabusa problems were solved with a fuel pressure reduction, the engine wouldn't pull from a few thousand rpm, but it did get the green bar on the MoT display.

I now have a Q....

Mog72 - 6/6/15 at 09:25 AM

Thank you all for the replies, I'm going to reduce the fuel pressure & give that a try

Do I need to turn the screw anti clockwise to reduce pressure ??
I'm going to try quarter of a turn ?