Re: Mercedes V 230 Misfire
Brian Cowan
I have a c class in at the moment that keeps losing cylinder 1. I fixed an air leak (breather hose)which is situated cyl 1 branch. I hoped this would sort fault but it hasn't, although fuel trim fault and air flow no longer set. I get misfire code cyl 1. In my scanner kts 520 there is a function for smooth running evaluation, it is a bar graph for each cyl. It shows a fault on cyl 1 even though it appears to tick over smoothly. I disabled another cylinder to prove the test was accurate and it was. I carried out compression test and found cylinder 1 to be about 15% lower. I spoke to merc specialist and was told valve problems very common. I suspect the induction leak may have damaged valve seat slightly. The moment the cylinder shuts down the mil comes on and logs misfire code. If I turn ign off and back on it resets and is back on 4. I hope this helps. brian
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