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316 views 5 replies 2 participants last post by  crispy coupe 
#1 ·
my missus car failed mot on this. ( 1.6 16v sport corsa b) tried new plugs, new filter and new lambda, still fails! only on fast idle test. reading should be 0.2, but cant get it below 0.59. car has just had head gasket replaced, could this be causing probs? seems to have a slight miss fire, could a simple blast with redex sort it? cheers, chris.
 
#6 ·
right, just had a thought. when i changed the plugs, i assusmed that they were pre-gapped, however, having been on the ngk website, it appears that they are not. could tghis be responsible for the small miss fire? also, on looking at my old plugs, on three of them there is a fair build up of black cdeposits. i understand that this may mean the mixture is too rich? if this is true, what causes this? cheers, chris.
 
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