Mot due tomorrow

[Grahamcol]

My old faithful C200 is due its MOT at 8am tomorrow. My only real concern is emissions on which it only just passed last year. The CO readings were just within limits, everything else comfortably in the middle of the respective ranges. My plan is to take it for a longish run on the motorway just before the test is due and I'm hoping this will ensure the CO is low enough to pass. The car often has only shortish runs and by doing this I'm hoping it will "blow away the cobwebs" so to speak. Hope this does the trick. Anyone got ant other tips ?

 

[Seamster15]

Italian tune up.. If safe while entering the motorway, keep her in 2nd and 3rd untill the limiter kicks in, but make sure she is warm first. Normally works for me.

 

[stevesey]

My CO is always too high if it's left idling before they do the emisions - rev it for 30 seconds and it's fine. I reckon that idle isn't enough to keep the cat fully warm - 2 quite big cats on a 240 each only serving 1.2 litres each (possible that cats aren't 100% as well).

Might be worth asking them to do the emisions first if you've been for a drive.

 

[Smiley]

Italian tune up.. If safe while entering the motorway, keep her in 2nd and 3rd untill the limiter kicks in, but make sure she is warm first. Normally works for me.

You do not need to take it to the limiter - just get the car nice and hot before the MOT and include a 5 mile run down a clear road with the engine revs at around 4,000 ish - hold in gear 3 if necessary. Will blow all the cobwebs out and should give you a much better reading.

 

[Seamster15]

You do not need to take it to the limiter - just get the car nice and hot before the MOT and include a 5 mile run down a clear road with the engine revs at around 4,000 ish - hold in gear 3 if necessary. Will blow all the cobwebs out and should give you a much better reading.

Why not?

 

[bouncer]

Agree, a nice run on the motorway with some good bursts of acceleration. Needs to get HOT to burn some of the crud off the lambda sensor. Cheap tip. . . . new air filter will help.

sTeve

 

[tim.100]

Anyone got ant other tips ?

A bottle of Injector Cleaner - 1 week ago. Always worked for my petrol cars.

 

[Grahamcol]

Thanks to all who replied. Yes, I changed the air filter a few weeks ago. Seems like I'm on the right lines here. Got my fingers crossed.