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Aug 21, 2021 17:21:54 GMT
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Ok so my six wheel RRC went in for its MOT yesterday
It passed, but the emissions analyser threw a wobbly because it's making less co than it did last year
Now, last year it had a disastrous td5 conversion, and shortly after that MOT I threw in the towel and replaced said boat anchor with a rebuilt 200tdi
I know I'm the antichrist because diesel, but neither the tester nor I could understand why this appeared to be listed as A Bad Thing?
Anybody enlighten me? Or is this just another example of those in their ivory towers?
Edit - my tester did say that the system had been playing him up all morning
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Aug 21, 2021 17:31:18 GMT
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I'm guessing its still registered as having a 3.5 V8 ?
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Aug 21, 2021 17:43:10 GMT
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No, on logbook as diesel, and tested as such last 13 years 🤔
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Aug 21, 2021 18:10:51 GMT
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I'm struggling to understand why it had a wobble? Have they got the latest emissions tester, the one with the bluetooth OBD dongle for the newer cars?
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Aug 21, 2021 18:33:29 GMT
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You're not the only one who doesn't understand!
It's far too old for all that Bluetooth obd stuff, it was the old pipe up the exhaust and a cable to the pc
It was the pc that flagged up lower emissions than last year, I just don't know why it should be an issue?
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Aug 21, 2021 18:41:16 GMT
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Are you sure your tester is using the smoke meter? You don't measure co on a diesel only smoke opacity and the system would not relate to last year's test. You test as presented not what's written on the V5.
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mk2cossie
Club Retro Rides Member
Posts: 2,949 
Club RR Member Number: 77
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MOT emissions confusionmk2cossie
@mk2cossie
Club Retro Rides Member 77
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Aug 21, 2021 19:13:14 GMT
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Well, for a start diesel emissions testing doesn't check for CO! Only smoke opacity  And if it has a standard 200tdi lump in there now, instead of some ropey TD5, it should be less smokey  |
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Aug 21, 2021 19:20:15 GMT
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If the pc has flagged it then the tester has entered the details incorrectly, it shouldn't even be looking for CO on a derv.
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Could be my confusion then, I just know that it flagged it up as being a problem. I'd used the term co as a generic emissions one, sorry for the misunderstanding
Thanks All
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Well, for a start diesel emissions testing doesn't check for CO! Only smoke opacity And if it has a standard 200tdi lump in there now, instead of some ropey TD5, it should be less smokey Yeah I'd expect a newly built TDI to be cleaner, it's why the system flagged it up as notable that was my question? It specifically noted that the emissions were lower than last year |
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if it didn't fail I wouldn't worry..
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The only vaguely similar event I can recall is when the EGR system on my A6 “stopped working”. The happy side effect was that it passed the opacity test in one pull rather than needing all 6 and filling the workshop with smoke as usual.
MoT man observed that he knew exactly how I’d done that, but wasn’t complaining!
Nick
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1967 Triumph Vitesse convertible (old friend)
1996 Audi A6 2.5 TDI Avant (still durability testing)
1972 GT6 Mk3 (Restored after loong rest & getting the hang of being a car again)
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