As highlighted a misfire a few months ago with ref to the engine management light and traction control light popping up. Bex brother has currently checked the spark plugs, injectors and changed the coil pack, leads and the crankshaft sensor but to no avail. I've also checked all engine wiring including all ABS sensors, still nothing found!! Apart from the fact that it is only missing on Cyl 2.

Then he inspected the cam with the help of a make-up mirror and found this on Cyl 1's lobes.



His next port of call was to check engine compressions and this highlighted a problem.

Cyl 1 - 6 bar
Cyl 2 - 0 bar ( yes zero )
Cyl 3 - 5 bar
Cyl 4 - 7 bar

With this info today he pulled the head off today to find this........



at a first glance it looks like alls ok, but then you look a little closer.........



One of the exhaust valves has a small crack in it and by the looks of it is on its way to breaking up......... hence the lack of compression and miss-fire.

New valves me thinks, all 16 of them!!!

Big valve head and performance camshaft?

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Is an option but need it back on the road asap and with Xmas money is tight

Helped a friend diagnose something similar on a Smart car - no compression in Cylinder 1, whilst Cylinder 2 shot a flame out the top and destroyed the compression tester

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2008 MINI Cooper S R56
2003 BMW Z4 3.0i SE Roadster

harsh news hope it all goes well!

Thanks, Should be back mid Jan

Thats horrid Whats the plan for the fix ? Just a new set of valves or you going to go BVH etc etc ??

What a 'mare

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Back in the fold... but being tempted out again...

Just std stuff at the mo

A few pics of the head

Attached Images

	clean head.jpg (95.7 KB, 4 views)
	clean head 1.jpg (83.4 KB, 5 views)

Glad you managed to get hold of a replacement head quickly.... looks like it is in good condition, is it new or recon?

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Driving my JCW is the best fun I've had with my clothes on!!!!