johnnyr6 Posted July 10, 2011 Posted July 10, 2011 Hi guys, my daily runabout (pug 306) failed its mot. One of the things was the co2. The car has been lying for about 3 months so i'm going to put a fuel cleaner in and give it a good run before the retest. One of the things i noticed on the test results was the mot tester has put 1400 for engine size but its actually a 1600. Will this make any difference? Cheers, Johnny.
widget Posted July 10, 2011 Posted July 10, 2011 (edited) yep engine size makes a difference. CO2 for 1.8 is 196g for 1.6 is 185g and for 1.4 is 156g so big difference mate. Edited July 10, 2011 by widget
craigdmcd Posted July 12, 2011 Posted July 12, 2011 For an MOT, the engine size doesn't matter at all when it comes to emissions. Craig (MOT inspector)
badbaz Posted July 12, 2011 Posted July 12, 2011 What was the CO result Johnny? Perhaps the cat just never got warm enough, has the car had a miss fire recently?
johnnyr6 Posted July 12, 2011 Author Posted July 12, 2011 (edited) Hi Barry Right, the pug is a wee cheap car i bought last august to get me to work and back over the winter and then move on. It was very cheap and has done 145k. In saying this it hasn't missed a beat so i'm going to keep it into at least next year or maybe until i get the scoob back on the road. The co reading was Fast idle: 0.82%, 2nd fast idle 0.62% this was after putting cat cleaner in the fuel and taking it a run for about 20miles including motorways. At the mot station it want straight onto the tester. It is running fine, no hesitation or misses, starts 1st time evry time. It burns a little oil but thats all. The MOT tester rekons it needs a new cat. Everything else on the car is fine, brakes are not the best but passed. Craig, i did a wee bit of research and realised this m8. Cheers, Johnny. Edited July 12, 2011 by JohnnyR6
badbaz Posted July 12, 2011 Posted July 12, 2011 Johnny, sometimes 3 mins isn't long enough to get the cat 'lit' but he's probably right, the cat is maybe done I'd hold it at higher revs for a few minutes and then give it one more go. It really depends how well you know the tester and how much he'll try!
scouk Posted July 12, 2011 Posted July 12, 2011 Sounds like it's possibly the cat. Particularly if it's still the origonal one.. only other thing I've come across is even a slight hole/blow on the exhaust can screw up the emissions test.. Mine was a bit dodgy one year but a quick splatter of exhaust paste got it through As for the heat thing.. My scoob was dropped off at the MOT station last year after only been runnign for about 10 mins.. Just scraped the emission test.. this year, no mechanical changes to the car but runnign for about 30 mins before the test and the emissions were near as dammit 0%.. .. Was worried that maybe the remaining cat in the downpipe should be starting to go but fromt he looks of things there's nout wrong with it
badbaz Posted July 12, 2011 Posted July 12, 2011 Blows in the exhaust affect the lambda rather than the CO Al
scouk Posted July 12, 2011 Posted July 12, 2011 D'oh! Fair doo's I remember it failed on something...
johnnyr6 Posted July 12, 2011 Author Posted July 12, 2011 Johnny, sometimes 3 mins isn't long enough to get the cat 'lit' but he's probably right, the cat is maybe done I'd hold it at higher revs for a few minutes and then give it one more go. It really depends how well you know the tester and how much he'll try! Cheers m8. i don't know the tester but he seems ok. When i told him i had just taken it a run including booting it on the motorway he said i'll put it straight on then so the cat should have been hot. Johnny.
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