Emissions well out = fail mot help please

pedGSR · Post by **pedGSR** » Sat Jul 20, 2013 10:29 am

Hi, I took the evo for its mot this morning. It's been off the road for two years now due to financial reasons. So it's first one for nearly 3 years!. All went well except the emissions which where incredibly high at 5.46 percent CO!
What could be making them so high? Any ideas?
It's got fresh fuel in, I drained all the old out. Gave it a good 10 mile hard drive on the way to the test centre.
It seems to smell like the cat isn't working well. Could the cat have gone from being sat up for 2 years?
Cheers, pete.

pedGSR · Post by **pedGSR** » Sat Jul 20, 2013 3:33 pm

Or could it be the lambda sensor? Using a voltmeter it don't appear to be switching. Could it put the emissions out that far though?

Daniel · Post by **Daniel** » Sat Jul 20, 2013 6:12 pm

Had the same issue mate with my recent MOT.
All it needed was a new fuel filter, and a bottle of Forte fuel system cleaner. Don't buy Redex, that stuff is shit.

drifter · Post by **drifter** » Sat Jul 20, 2013 6:56 pm

pedGSR wrote:Or could it be the lambda sensor? Using a voltmeter it don't appear to be switching. Could it put the emissions out that far though?

If the lambda constantly reads lean the ecu will dump in more fuel afaik

It should be flicking back and forwards between 0-1 volt if it's the standard narrow band sensor

pedGSR · Post by **pedGSR** » Fri Jul 26, 2013 11:37 am

Ok so I've fitted a new lambda sensor and its failed again. This time CO is 11.06 percent. Any ideas please people

Post by **Ben** » Fri Jul 26, 2013 12:14 pm

Yep, tow it to gary's

pedGSR · Post by **pedGSR** » Fri Jul 26, 2013 12:54 pm

I would do if it wasn't 40 miles away

pedGSR · Post by **pedGSR** » Fri Jul 26, 2013 1:29 pm

Does anyone have a CO meter I could borrow? I have a old gunson gastester but it seems really inaccurate?
Pete.

Daniel · Post by **Daniel** » Fri Jul 26, 2013 3:52 pm

Pete, did you see my reply to this post? As I say, I had the exact same problem only two weeks ago.

pedGSR · Post by **pedGSR** » Fri Jul 26, 2013 4:17 pm

Yes, cheers Daniel. That will be my next step I think along with an oil change and a engine temperature sensor. Can't think what else it could be to put it out that far!?