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PostPosted: Fri Jun 08, 2018 1:55 pm 
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Light Pressure Turbo
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Joined: Fri Jul 28, 2006 4:51 pm
Posts: 497
Location: Essex
Car Model: 900 t16s auto vert
At the mot the tester said it was running rich so it just scraped through emmisions.
It has no cat as this was removed as it's not required being an early 1992 model.
Not had the spark plugs out yet to confirm it's running rich.
My question is with Lucas fuel injection how do I turn the mixture down or is it a case of i can't and will need to clean things???


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PostPosted: Fri Jun 08, 2018 9:13 pm 
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From what I remember if it was registered after Aug '92 (K plate onwards) then it should be tested as a cat equipped car.
If it passed this test without a cat then that's pretty good and probably nothing wrong with it!

No way of adjusting mixture on cat equipped cars. If running rich could be any number of things but check first that the fuel pressure has not been increased from standard 3 bar. Does the CEL work? Does it go out and stay out with engine running?


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PostPosted: Fri Jun 08, 2018 11:50 pm 
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Location: Devon
It may be useful to post the actual emissions readings (and their limits) so we can see which one was out of spec.
I read your initial post as saying you have a car first registered before August 1992 (i.e. an "early" 1992 car).

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PostPosted: Mon Jun 11, 2018 7:53 pm 
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Light Pressure Turbo
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Joined: Fri Jul 28, 2006 4:51 pm
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Location: Essex
Car Model: 900 t16s auto vert
The check engine light is on when I start up and goes out as it should.
Attached is the emissions from the MOT.


Attachments:
PhotoPictureResizer_180611_205010237_crop_487x423-800x695.jpg
PhotoPictureResizer_180611_205010237_crop_487x423-800x695.jpg [ 55.13 KiB | Viewed 351 times ]
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PostPosted: Mon Jun 11, 2018 8:02 pm 
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Light Pressure Turbo

Joined: Fri Jun 16, 2006 9:26 pm
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That's spot on, what you would expect without a cat. Certainly not rich.
In the days when idle mixture was adjustable the setting was about 1.6% CO for a 16v T.


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PostPosted: Mon Jun 11, 2018 8:18 pm 
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Just re-read your first post and don't understand how the tester can claim it "just scraped through"!
Considering the upper limit for CO is 3.5% and it was only 0.72% and upper limit for HC is 1200PPM and it was only 209PPM I'd say it passed with flying colours! Obviously you'd expect lower readings with a cat fitted.

As Bill said obviously pre Aug '92 as those are pre cat test limits.


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PostPosted: Tue Jun 12, 2018 12:15 pm 
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Location: Ipswich, Suffolk
Car Model: 900T16s, Daihatsu Charade GTti
99 Pete wrote:
Just re-read your first post and don't understand how the tester can claim it "just scraped through"!
Considering the upper limit for CO is 3.5% and it was only 0.72% and upper limit for HC is 1200PPM and it was only 209PPM I'd say it passed with flying colours! Obviously you'd expect lower readings with a cat fitted.

As Bill said obviously pre Aug '92 as those are pre cat test limits.


That's what I wondered, rich running would push the HC up, it is a unburnt fuel after all and yet this shows it's pretty good?


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PostPosted: Tue Jun 12, 2018 11:21 pm 
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Light Pressure Turbo
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Joined: Fri Jul 28, 2006 4:51 pm
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Location: Essex
Car Model: 900 t16s auto vert
99 Pete wrote:
Just re-read your first post and don't understand how the tester can claim it "just scraped through"!
Considering the upper limit for CO is 3.5% and it was only 0.72% and upper limit for HC is 1200PPM and it was only 209PPM I'd say it passed with flying colours! Obviously you'd expect lower readings with a cat fitted.



As Bill said obviously pre Aug '92 as those are pre cat test limits.


Maybe he just wanted me to think he had done me some sort of big favour as it was the first day of the revised MOT tests.

Looking closer at the figures it passed with ease.
You guys never fail me, thanks.


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