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[AndyStobbs]

Is the lifter sitting low on the affected cylinder? Could it even be a pumped up lifter? Well worth checking before the head comes off.

[Marks DTM Calib]

Way ahead of you on that, and no, lifters all good and even force bled them down on that cylinder

[AndyStobbs]

Way ahead of you on that, and no, lifters all good and even force bled them down on that cylinder

Didn't think you would've missed it to be honest. Interested to hear the outcome of this one. Some of the borescope kits have a tiny mirror attachment to enable the viewing of valves.
A failed knock sensor would be a bad start in this situation as it could be a contributing factor to a hot cylinder, that said in my experience they usually drop into limp at the slightest hint of KS issues.

[Marks DTM Calib]

Motronic setup retards valve timing (by 12 degrees I seem to recall) under knock sensor fault detection

[AndyStobbs]

Must end up firing ATDC in some situations at -12 degrees. No wonder they feel flat. Never had any of my vehicles in a forced limp mode, but have experienced it on a friends x25.

[Marks DTM Calib]

Yep, they are hopelessly slow, unplug one and you will see

[brian36]

can I just say I didn't think it would cause you so much agro but then again its a challenge and hope that you like such a challenge I appreciate all your doing to help me and await the outcome

[Webby the Bear]

can I just say I didn't think it would cause you so much agro but then again its a challenge and hope that you like such a challenge I appreciate all your doing to help me and await the outcome

Did he tell you he's keeping the car after?!? 

[Webby the Bear]

But a single valve on a single cylinder with a tooth out?

In reality a single tooth wont cause valve impact, and the heads still not off, some arse has used standard nuts on the front pipe to manifold connection and rounded them off, got one off but the other needs cutting.

Getting quite a list of bits needed here, thankfully I have some already

Fair enough
Can't wait for strip down and conclusion

[brian36]

can I just say I didn't think it would cause you so much agro but then again its a challenge and hope that you like such a challenge I appreciate all your doing to help me and await the outcome

Did he tell you he's keeping the car after?!? 

to be honest I wouldn't blame him but I reckon he knows how desperate I am to get my miggy back but I am glad I have a expert on the case!!

[Webby the Bear]

can I just say I didn't think it would cause you so much agro but then again its a challenge and hope that you like such a challenge I appreciate all your doing to help me and await the outcome

Did he tell you he's keeping the car after?!? 

to be honest I wouldn't blame him but I reckon he knows how desperate I am to get my miggy back but I am glad I have a expert on the case!!

he is that mate 

[omegod]

Got a pair of complete 2.6 heads in the shed if any bits needed

[Marks DTM Calib]

Head is off....!

The culprit:



Removed and good valve fitted and lapped to check the seat:

[Webby the Bear]

they look like gauges.... any idea how that's happened? debris in the cylinder?

[Marks DTM Calib]

Once you get a point that does not seal, the gas erodes the valve and creates the gouges.

Thankfully the seats are hardened so they get away with it.