Club 80-90 Forums

This problem concerns me a little too, your not the only one. Having never had a problem with emissions previously I had a long conversation with my local VW CV main dealer about this as my 1.9 DG barely passed on emissions. They had to add a fuel treatment (sure it was Fortron) to get it through, and before anyone says 'rip off' or 'snake oil' blah, I wasnt even charged for it.

They advised me to service it prior to MOT moving forward, so while I do that I will also drop some additive as above, Fortron or Wynns seems readily available, although there are a few out there.

Obviously I want the camper to pass without any technical defects, I keep it as perfect as possible, so the emissions reducer is just a back up. I also overhauled the Carb, a standard Pierburg 2E3, the auto choke was miles out of tolerance, I replaced it (I am almost sure the auto choke unit is now discontinued and unavailable), The pull down unit was completely knackered with a split pipe, so that was changed also.

Other than that I wondered about a Terraclean, however feedback on the use of this on a T25 varies.

Lets hope it goes through MOT next time without a comment or i'm on to plan B.

Elsaetka wrote:I also overhauled the Carb, a standard Pierburg 2E3, the auto choke was miles out of tolerance, I replaced it (I am almost sure the auto choke unit is now discontinued and unavailable), The pull down unit was completely knackered with a split pipe, so that was changed also.

Fixing the cause, rather than addressing the symptom, is always the best bet - and you've done that now, by the sound. Choke being partly on plus an air leak = guaranteed wrong mixture = emission fail.

There's only two things checked on the MOT for emissions - unburnt fuel (HC) and CO. Both have a MILE of latitude for a healthy, well-set-up engine. If there's a fail, or even close, something is wrong - and you're burning a lot more fuel than you should be.