GolfGTIforum.co.uk
Model specific boards => Golf mk2 => Topic started by: Mk2Kezza on 06 October 2010, 18:40
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Right.
Recently had an MOT and it failed on the emmisions - Hydrocarbon content too high. Probably my fault as I timed up the engine and messed about witht the mixture. Anyway, had the car tuned on Monday night, CO was 0.1 so as I expected, she was running lean, hence high HC content. The dude, tuned her so she read 1.9 % CO, yet she bloody failed the MOT tonight again! This time the CO was 4.5%....
Any idea why it has shot up in two days? Only done about 50 miles in her.
She's an 1.8 8V digifant (1990).
Grrrr, bloody car :-(
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Had a simular issue with a 8V and was scratching my head and it was a simple issue the idle screw and co adjuster had threaded due to the owner kept mucking about with them and they eventually started to move about by themselves after driving. To prove this all I did was stick tippex at one point and told him if this mark moves you die! :wink: He came back and it had vibrated loose again!
So check both screws have no play if they do you might want to change the adjuster screws then drop some lock thread on the edge to seal it up.
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Did you try slipping the MOT tester £5 ... I've found that usually solves emissions problems :rolleyes:
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I've always been told to give the car a good hammering before the MOT test to help with the emissions....dunno if it does anything but I've failed on many things but never emissions!
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I'm off back to the tuning station lunchtime to get her tested again before tkaing her back for the retest after work.. Such a pain, as ironically, since being tested she is running like a dream!!
Cheers lads, i'll let you know how she gets on later.
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when the co was fiddled with was it done properly as per the digifant tuning guide? cant just mess with the screws
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Well, she passed! The dude was not there lunchtime but I messed with the mixture screw and lowered it at the MOT station.
RJ, the dude who tuned it ignored your tuning guide and literelly fiddled with it in front of my eyes!
Needless to say, i've no idea whether she is running right, however I have another years ticket to ride!
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have to get it rechecked as per the guide, it'll never be right if you just mess with the co screw
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I agree, the only problem being is I have not got a CO tester and its becoming increasingly more difficult to find someone with a meter who will acutally listen to the right instructions!
Are the gunson ones any good?
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Are the gunson ones any good?
Not worth buying one
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My gunson one isn't too bad. I let it warm up in the garage (With the car not in) connected to another battery for about 45 minutes, the reading doesn't seem to drift then
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they can be a right faff them gunson ones, better than nothing i suppose. if you could ask a garage nicely with some back pocket tax free money they might let you borrow their machine for a half an hour or so. or rip engine out and fit MK3 16v ABF lump with the proper ABF management, they dont need idle or CO tuning :grin: