When I start my 560 SEC (141000km) the engine turn about 5 Times before it starts and when it Idle at 700 RPM it idle uneven. Mercedes done compression test and said that’s ok. What could be the problem?
My hard starting problem was due to worn injectors. It seems that 150K miles is about the limit for them.
If the hard starting is accompanied by the sweet smell of petrol and a puff of black smoke from the exhaust, them I would guess that this is the problem.
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