MOT fail - CO high & hazards

[smashyvan]

Hi all,
Van just failed MOT on high CO & flashers not working on nearside. Engine 1.9DG petrol with Pierburg carb. Never failed emissions before, but van not used much over last year.
TBO I thought mixture was ok - last time i checked plugs they looked right shade (light brown). Is there any adjustment / cleaning I can do or would a flat out (70 plus o err) blast do the trick?
Hazards dont work on one side - gotta be simple to anyone except me - garage reckoned dogy relay, any ideas folks ?

[1_eyed_jim]

https://club8090.co.uk/forum/viewtopic.php?f=37&t=103405" onclick="window.open(this.href);return false;

[hammy44]

think there is a fuse for left and fuse for right indicators if my mem serves me right only one flasher unit.maybe thats for lights so either fuse or relay or bad connection.

[smashyvan]

Thanks guys for replies - but mine is 1.9dg not 2.1 which I think has additional sensor gubbins to go wrong.

As far as I know the Pierburg has nothing to twiddle to alter mixture (unless someone knows differently).... sooo what should I check / change?
CO is 4.86 v max limit 3.5. Am thinking usual - plugs, airfilter (or even remove this for the test), check choke is resetting when warm, any other ideas??

[California Dreamin]

Just needs an 1/4 turn in on the mixture screw.
What gets me is this is idle mixture only and the carb quickly turns to the main jet once off idle.

Martin

[smashyvan]

Thanks Martin - I have found idle adjusting screw in exploded view in Haynes manual, will check it out tomorrow, but... I have vague recollection that there is a plastic plug stopping any adjustment - or did I just dream it??

[CovKid]

As a guide, get engine ticking over fast enough then wind idle screw in until revs just begin to drop then quarter turn out. Unless air filter is clogged or it burns a lot of oil, that should set it well within specs.

[smashyvan]

Thanks - CovKid & Marten, found the screw wound it in - job hopefully jobbed

More good news, took the flasher relay out and replaced - hey presto the hazards all work

Now for the retest...