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Discussion Starter #1 (Edited)
GTV V6 failed MOT yesterday on emissions plus 15 advisories :cool: ! Nothing bad just the usual wear & tear stuff like brakes, airbag light etc but what I cannot get my head around is the extent it failed on the emissions test. Check these figures out :

1st fast idle test:
Carbon Monoxide: limit = 0.20 / actual = 65.54 FAIL
HC (hydrocarbons): limit = 200ppm / actual = 65,535 FAIL

2nd fast Natural
Carbon Monoxide: limit = 0.30 / actual = 65.54 FAIL
HC (hydrocarbons) ... well, they didn't even bother to do it, no point really....

.... the fella at National Tyres (alarm bells already....) said it literally went off the scale it was so bad. Soooo ... maybe that's why all the trees have dissolved near my house ....:eek: .Seriously, I know a lot about gases as I sell gas detection kit amongst other things for my job , I find it v hard to believe the above results. 65,535 ppm VOC's (Hydrocarbons) is literally pure petrol fumes, surely my car can't be running that rich??? It runs superb & smooth, had a full service about 2k miles ago with injection cleaner ... though Gus at Alfatune who did it did have to clean the lambda sensor as it was running a bit rough at that point. No problems since. I tend to use it most at w'ends though & it does go a few days without being driven sometimes.

Any clues??? I guess the first thing to do is new air filter & a nice long run on m/way? New lambda sensor you reckon as well? But if it's running fine does it really need a new one? Or maybe they're just useless at National Tyres or the machine is knacked, on the wrong scale or summat.....

Also, I need to get it all sorted to get a free re-test within 10 days. Ferdi's Garage Lytham is off on hols, not sure if Gus at Alfatune can do repairs he's more of a tuning man (I'll ask him though) ... so does anyone know a decent Alfa specalist in the North West? There are loads down South but up here they seem pretty scant.

Muchos gracios!
 

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65,535 is the highest number that you can represent with 16 bits, and 65.54 obviously a rounding of the same and represented differently. I'd suspect equipment failure.
 

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Get an Alfa specialist to do the MOT. Was the MOT tester out of nappies? Seriously though, you get useless people in all professions. Id lay down the money and get a second opinion. I had the same thing a few years ago where I went with a half price MOT offer. Car failed with some advisories. Went to my usual garage and they said what a load of rubbish and passed it with no advisories.
 

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65535 is a very suspicious figure.

65535 is 2^16 - the full capacity of an unsigned word ( that's 2 bytes in computer storage ). The maximum permitted value of 200ppm could be stored in just one byte. That's a huge discrepancy.

I wonder if they properly reset the machine after the previous test?

It may be worth picking up the phone and calling VOSA and asking if a genuine reading of 65535 is actually possible.


EDIT : as trashbat says.
 

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Discussion Starter #6 (Edited)
Cheers for the fast replies fella's:thumbs: . I never flippin learn, like Oliver K it was a half-price MOT with National Tyres. It took the knuckle-dragging grease monkey 2 full hrs to do the MOT, normally it takes an hour so like you all say it does point to incompetence. It does make you think do they fail it on purpose then get you to come back for them to "repair" it and charge :eek: . And yes, any warning light on the dashboard is an automatic failure (new recent regs) so why they didn't fail it on Airbag light is another alarm bell.

Cheers trashbat, that's news to me about the readings and makes total sense re knacked machine. If it's the same technology what's used in the VOC HC Kit I sell (and it prob is) they're tempermental & need calibrating & cleaning evey 6months anyway.

Good idea PKR - will call em this aft

Alfa specialist (somewhere in the NW...) here I come ...!
 

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Sounds dodgey to me, I would let VOSA know your experience there. MOT tester is difficult job that requires not only a good deal of experience in the trade, but then also specific training on top. It sounds like they may have an un-qualified person signing off MOT's
 

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Also the CO figure is 65.54 which is 65.535 rounded up to 2 decimal places. Machine is broken. Complain to the manager, threaten VOSA, get your money back and get it re-tested somewhere else.
 

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Take it somewhere else just for an emission check, if is still high it could be the Lambda. Should be replaced every 60k.
 

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As for airbag light, i didn't have the time this year to remove the ecu and clear it so i removed two screws from speedo and removed black facia and grabbed some black insulation tape and Airbag light fail cured, (10-15 min Job);)
 

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Discussion Starter #12
Just been back to National Tyres & complained - and they admitted their machine is indeed "knackered" as a Rover they MOT'd after me did exactly the same thing. But then the grease monkey who did my MOT lumbered in & said it was fine before he put my Alfa on it .....:rolleyes: . Was half expecting to be landed with a bill to fix their Emissions Analyser..... they were also complaining my GTV wouldn't fit properly on their ramps :wow: . yeah, like it's as wide as a Testarossa .......

Aaaaanyway, panic over & lesson learned, you only get what you pay for etc etc. It failed anyway on "RBT Park Brake Efficiency @ 15%" ie) handbrake, the pass level is 16% ........ prob just needs new rear pads.

Ta for top tip EauRouge. But will get it all MOT'd again & sorted at Alfa specialist who can knock the airbag light off with his widget.

Oh BTW - I rang AllItalia Alfa specialists in Wrexham - the dashboard light failure thing only applies to cars below a certain age, older cars it passes but with an Advisory. Now I'm just trying to find a specialist closer to Preston .... don't fancy driving all the way to N Wales with no MOT & unmarked coppers on the m'way, Sod's Law etc etc :cry:
 

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Discussion Starter #13
PS: forgot to mention - AllItalia Wrexham were really helpful & friendly. Knew their stuff, def going there in 2 weeks if I can't find an Alfa specialist closer to home.

Cheers for all the advice as well chaps, nice one.
 

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Weak Handbrake thread.
http://www.alfaowner.com/Forum/alfa-gtv-and-916-spider/403321-weak-handbrake.html
Mine only just scraped thorough despite doing all the stuff recommended on here.
Local MOT guy, who knows old Fiats suggested winding pistons OUT till pads can just squeeze in, then attaching cable. Must be sure they are returning to the stops when lever is down though, or the auto adjust mech will not pick up when it needs to.
 
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Just been back to National Tyres & complained - and they admitted their machine is indeed "knackered" as a Rover they MOT'd after me did exactly the same thing. But then the grease monkey who did my MOT lumbered in & said it was fine before he put my Alfa on it .....:rolleyes: . Was half expecting to be landed with a bill to fix their Emissions Analyser..... they were also complaining my GTV wouldn't fit properly on their ramps :wow: . yeah, like it's as wide as a Testarossa .......

Aaaaanyway, panic over & lesson learned, you only get what you pay for etc etc. It failed anyway on "RBT Park Brake Efficiency @ 15%" ie) handbrake, the pass level is 16% ........ prob just needs new rear pads.

Ta for top tip EauRouge. But will get it all MOT'd again & sorted at Alfa specialist who can knock the airbag light off with his widget.

Oh BTW - I rang AllItalia Alfa specialists in Wrexham - the dashboard light failure thing only applies to cars below a certain age, older cars it passes but with an Advisory. Now I'm just trying to find a specialist closer to Preston .... don't fancy driving all the way to N Wales with no MOT & unmarked coppers on the m'way, Sod's Law etc etc :cry:
I might be wrong on this and feel free to correct me but I'm sure you can drive on the road with no mot as long as you are driving to the point of mot test. I am going back a while since this used to be the case so it may well have changed now.
 

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I might be wrong on this and feel free to correct me but I'm sure you can drive on the road with no mot as long as you are driving to the point of mot test.
It's a little more complex than that. Strictly speaking you should be driving to an MOT station with an appointment and the test station should be the closest to you.
 
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