Hello all once again. I am the proud (cough) owner of a 1.0L 6N Polo (1999). It has failed its MOT on emissions once again, despite havin a complete new cat+exhaust for its MOT last year and a dump load of cleaning products down its gullet. Was wondering if there are any common faults which could be causing this. Any help much appreciated.
Emissions Nightmare
- Thread starter aworsley4
- Start date
The most common issue is a misfire spewing unburnt fuel into the catalyst or a tendency to run rich. Get the AFR/MAF sensor checked as well. Split leads, dirty plugs or a faulty coil can cause a misfire.
Does it do lots of short journeys and have you tried superunleaded? A motorway run with superunleaded at high rpm should help clean things up a bit.
Does it do lots of short journeys and have you tried superunleaded? A motorway run with superunleaded at high rpm should help clean things up a bit.
bigbadjoe
Pro Tuner
Tend not to have this problem.
Go down your local drinker and find somone who does MOT's. Then get him drunk. Then Become his best mate, and volonteer to help him out when ever you can. Then hint that you need an MOT and emissions is a problem. That should sort you out! :cheesy:
Go down your local drinker and find somone who does MOT's. Then get him drunk. Then Become his best mate, and volonteer to help him out when ever you can. Then hint that you need an MOT and emissions is a problem. That should sort you out! :cheesy:
Loz
Torque King
Glad you got it sorted :bigsmile: But how did the work above sort out your emissions? 
mattyj2121
Newbie
Sorry to disagree, but the reason you send your car up the motorway at high rpm before a emissions test is to get the catalyst very hot, super unleaded will have no effect unless the fuel supplier is running a detergent in the fuel, so save your money and stick to 95 unleaded.
