Mk1 DX Engine in T25 Camper - Co2 level?

[bmouthboyo]

Hi guys,

I bought a gas tester to set the fuel / air ratio on my kjet engine.

Can anyone advise what % I need to set it to given the engine and vehicle for an MOT?

Does the limit depend on vehicle or engine?

Obviously due the engine being at rear of the vehicle it does not have a cat converter fitted. Will I have to adjust the Co2 to take this into account?

Cheers

[danny_p]

1.8%  iirc

[SoundillusioN]

1.8%  iirc

correct and don't fret too much about it as the the emissions if tested are on the year of the engine, not the car.  A mk1 DX would never have had a cat.  I think the limit is much higher than 1.8% to pass.

[danny_p]

anything under 3.5% is good for a pass.   

TBH its a massive goal to aim for,  when i'm serviceing and getting things ready for mot  i don't normaly bother useing a gas tester anymore. you get the feel for them and there a pice of piss to setup by feel if there going to setup.  and emission test from mot usally comes back saying there spot on.  gas tester only comes out when there being awkward   

[bmouthboyo]

thanks guys, i got it to 2.0% so that should be fine.

After MOT is there and ideal setting? or is that the sweet spot anyway?

[Wayne]

thanks guys, i got it to 2.0% so that should be fine.

After MOT is there and ideal setting? or is that the sweet spot anyway?

Sounds fine 

[bmouthboyo]

OK so today it passed it's Emissions but the readings seem very low:

CO Level - 0.12%
HC Level - 598 ppm

Now at home using my Gunson Gas Tester I set it to 2%??

Also after getting the vehicle back it fails to idle well and I had a pig of a job starting it when I stopped at shops on way home. Is it usual for garages to fiddle with the idle or fuel / air ratio during MOT? My van doesn't have tachometer so the idle speed section is blank on the results.

[Wayne]

OK so today it passed it's Emissions but the readings seem very low:

CO Level - 0.12%
HC Level - 598 ppm

Now at home using my Gunson Gas Tester I set it to 2%??

Also after getting the vehicle back it fails to idle well and I had a pig of a job starting it when I stopped at shops on way home. Is it usual for garages to fiddle with the idle or fuel / air ratio during MOT? My van doesn't have tachometer so the idle speed section is blank on the results.

That is very low co level, might be the fuel pressure dropping which is making it hard to start.

[bmouthboyo]

What could be causing the fuel pressure to drop? Weird thing is it was fine before the MOT, although admittedly to the station was the first time I have driven it. And I only just set it to 2% using my Gunson gas tester the other week.

It has had new filter and tank flushed when I serviced it.

Bit stumped really as I can't test the pressure cause CIS fuel pressure testing kits for the Kjet system are like hens teeth.

[Neo Badness]

OK so today it passed it's Emissions but the readings seem very low:

CO Level - 0.12%
HC Level - 598 ppm

Now at home using my Gunson Gas Tester I set it to 2%??

Also after getting the vehicle back it fails to idle well and I had a pig of a job starting it when I stopped at shops on way home. Is it usual for garages to fiddle with the idle or fuel / air ratio during MOT? My van doesn't have tachometer so the idle speed section is blank on the results.

I don't wish to thread crash but I had a similar experience with the 16v KR would need to double check the emission part of mot but wasn't far off that.