RV8 MOT emissions fail, help needed

DaveEFI · Post by **DaveEFI** » Thu Aug 28, 2014 2:56 pm

You've checked the obvious things like the air filter?

Should be 1-2% CO.

The Saint · Post by **The Saint** » Thu Aug 28, 2014 3:03 pm

It has a K&N cylinder filter which was cleaned and re-oiled less than 500 miles ago.
What else can I check ?

ChrisJC · Post by **ChrisJC** » Thu Aug 28, 2014 8:49 pm

Is there not an adjustment for CO? I forget.

Chris.

SimpleSimon · Post by **SimpleSimon** » Sat Aug 30, 2014 10:39 pm

There should be a CO/mixture screw on the air mass meter if its a pre-cat engine

I am assuming its a pre-cat EFI RV8

The Saint · Post by **The Saint** » Sun Aug 31, 2014 7:55 pm

It's a '91 3.9 RV8 Range rover classic. It has no cats but has a full stainless exhaust system. I'm assuming the cats haven't been removed with the exhaust change.

stevieturbo · Post by **stevieturbo** » Sun Aug 31, 2014 8:45 pm

There may be some way of adjusting mixture, all the CO is saying is that it is a little richer than maybe liked for MOT purposes.
But still perfectly legal and not a problem

SimpleSimon · Post by **SimpleSimon** » Sun Aug 31, 2014 9:54 pm

The Saint wrote:It's a '91 3.9 RV8 Range rover classic. It has no cats but has a full stainless exhaust system. I'm assuming the cats haven't been removed with the exhaust change.

That being the case it as a small recessed screw/potentiometer on the Air Flow Meter in a recess on the exit side, you can see its housing right of this pic