4th cylinder problems
#1
4th cylinder problems
Hello!
So 2010 S Clubman started shaking and rough start/idle. Giving me random misfire and cylinder 4 misfires.
Here is what I've done:
Checked for leaks - none
Checked valve cover for cracks - none
Removed valve cover to replace gasket - no improvement
unplugged the electrical connector from each coil one at a time- when removing 1-3 the engine slows or almost shuts off, unplug 4 and nothing happens.
Swapped coils - same issue but still only on cylinder 4
Removed spark plugs - all looked good except cylinder 4 plug was black and covered in soot. (could not see anything wet or oily at the base of the plugs)
Replaced spark plug with new one - nothing
Checked that the 4th cylinder connector was sending power to the plug - check, it sparks!
So what is left now? Check the injector? Obviously things are working down to the spark plug but after that something is going awry.
So 2010 S Clubman started shaking and rough start/idle. Giving me random misfire and cylinder 4 misfires.
Here is what I've done:
Checked for leaks - none
Checked valve cover for cracks - none
Removed valve cover to replace gasket - no improvement
unplugged the electrical connector from each coil one at a time- when removing 1-3 the engine slows or almost shuts off, unplug 4 and nothing happens.
Swapped coils - same issue but still only on cylinder 4
Removed spark plugs - all looked good except cylinder 4 plug was black and covered in soot. (could not see anything wet or oily at the base of the plugs)
Replaced spark plug with new one - nothing
Checked that the 4th cylinder connector was sending power to the plug - check, it sparks!
So what is left now? Check the injector? Obviously things are working down to the spark plug but after that something is going awry.
#3
so I took it to the mechanic to check the injectors. Apparently they work fine and are clean but there is 0 compression to the 4th cylinder. All other three are between 170 and 190. Also they checked the HPFP and it’s perfect. So they’re thinking the motor. Took the valve cover off and the 4 springs look and move great. Now looking at it being a piston/cylinder block. Looking to replace the whole thing. Thoughts? Anybody seen this? They said it’s pretty common for the mini
#6
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