C180 Misfire

[OllieCollie]

Please help, I have changed the battery on my 2004 C180 after it standing so much, now it has a misfire, the code is as below. I have changed the coil pack on cylinder 4 and it has had new plugs. The car has genuinely done 35000 miles.

 

[Continental]

did whoever did the work clear the codes?

 

[W1ghty]

Swap the coil from number 4 to one of the others and see if the fault follows it

 

[Petrol Pete]

Are we talking about a car with a M271 engine and the notorious cam chain that jumps a tooth and will still run , but just a bit rough until it blows up and sends the car straight to the scrapyard , not passing GO and not collecting £200 on the way ?

 

[Trunkz]

Are we talking about a car with a M271 engine and the notorious cam chain that jumps a tooth and will still run , but just a bit rough until it blows up and sends the car straight to the scrapyard , not passing GO and not collecting £200 on the way ?

Bloody hell I havent seen a modis unit in a long time.

1. Is this a genuine coil and not a crappy 3rd party make? If so; like w1ghty said; swap the coils around and see if you are still getting a misfire. Also check the correct plugs were used. I say this because I have seen mechs use the cheapest quality plugs ECP will supply; which arent necessarily the right type / correct gap etc..

2. This engine suffers from camshaft gears which wear out; thus allowing a stretching cam chain to jump and cause above issues. Easy to diagnose; whip off the valve cover and take a look at the two camshaft gears.

Whilst the mileage is low; the camshaft issue can happen on lower-mileage cars so please do not rule this out on the basis of low mileage alone.

 

[Petrol Pete]

Ollie. google 'M271 cam chain issues' and don't run the engine until you are sure of what you are looking at. I wouldn't expect problems at 35K miles but they have been known to fail even with a full MB service history.