A few of my trade customers have shown me a very very common problem with the 271 engine (all the way up to 2009) where the loom somehow transports oil up to the ECU mounted on the side of the block! This damages different circuits on the ECU, I have seen a number of vehicles that...
Our 2002 c180k estate, 271 engine, had its cylinder head replaced last september. The original head suffered from the carbon build on valve shoe problem causing misfire when engine hot and idling and engine light to come on (i found similar posts about the problem, links below).
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