Cylinder 4

[Wayne Morris]

Hi All

Hope you are all having a pleasant weekend?

I have had a occasional misfire on Cylinder 4 of my Merc C200 W203 Kompressor.

The spark plugs where recently changed on its last service and the problem seem to minimise to once a months appearence.

I am therefore thinking that changing the coil pack on Cylinder 4 would be the next move forward.

Now for the funny question, which one is Cylinger 4 please?

Thank you in advance

 

[LostKiwi]

On a 4 cylinder it' furthest from radiator.
On a V6 front passenger side bank.
On a V8 furthest from radiator drivers side bank.

 

[Wayne Morris]

On a 4 cylinder it' furthest from radiator.
On a V6 front passenger side bank.
On a V8 furthest from radiator drivers side bank.

Brilliant thank you mate

 

[Coupe]

Does the misfire on 4 give you a fault code? You could try swapping coil 3 for 4 and see if the problem transfers to 3 then it’s likely to be the coil. I’m assuming your engine has 4 Coils one for each cylinder. If you do be careful when unclipping the coil wire as over time they can become brittle.

 

[Wayne Morris]

Thank you guys for all your help with this in the past, I finlly got round to fitting the Ignition Coil to Cylinder 4, reset the Engine management light but came back on after a little while with same error:

P0304 Cylinder 4 misfire.

Has had complete set of sparks on last service and fitted the new coil pack as per LostKiwi advice above, 4 coil packs in total under the Kompressor cover, the one furthest away from you towards dashboard. Is this correct? Just want to check that this is Cylinder 4?

Next time I'm off I think possibly swapping all the coil packs around be a idea to see if can move the fault to another cylinder.

The car has full service history and has covered a mere 85,000 miles.

In general the cars perfect not showing any signs of problems. Just before the engine management light comes on (99% time at stand still / tick over) the car will shake briefly, light comes on then runs no different.

Thank you

 

[LostKiwi]

the one furthest away from you towards dashboard. Is this correct? Just want to check that this is Cylinder 4?

Correct.