In the event that the air channel is messy to the point that it limits wind current generally,the PC controls will not have the option to make up for this,and the air/fuel proportion will be excessively rich to appropriately work. On the other hand,assuming there is an air spill past where the wind current is estimated,the air/fuel proportion will be excessively lean. Either condition can cause a deficiency of force,or even a failure to discharge.