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[05omegav6]

James Do you think the foreign Objects Had to be harder than the surfaces that have been damaged

The electrodes on a spark plug could easily do that as they and the pistons are steel, whereas the head is soft as toffee aluminum

And what possible situation could there be where 3 electrodes have all came off 

Crap plugs 

That said, mine were GM twins... but all were loose after only 500 miles. So wonder if the electrical issue causes it to run lean, knackering the plugs due to a weak spark, leading to them going brittle and falling apart...

Anything in your history regarding investigative head/cam work? For the cam caps to be fitted wrongly to wear as they have (as per Marks suggestion), could the cams have been removed to check the lifters?

If the only cam history is when you put the car in for a cambelt/service, how long did they have the car for? Someone might have been trying to hide summat

The cam shells were all in the correct orientation and positions when we stripped it..

Even if it were three plugs that failed...

The question remains unanswered - why was this car having no problems prior to the Cambelt/service/camcovers/stat work - and making nasty metallic noises + misfiring the minute the key was turned after the work?

I'm only asking the question for one reason - to get to the bottom of the fault.

It's just too big a co incidence IMHO that it was fine before the work and so rough straight after

Those cam caps have been fitted in the wrong place/orientation in the past I would infer by looking at the wear.

But clearly they are not contributing to the issues.

Do a valve leak down test to check where the compression loss is before doing anything.

[JamesV6CDX]

I get marks comments, but naturally I can only comment on what i saw on strip down. We'll probably never know it's full history...

[JamesV6CDX]

But even if the cam shells had been fitted wrongly in the past. Still nobody knows - why was it fine before the Cambelt , covers, stat and plugs were changed, and fubar'd immediately after?

Co incidence?

[Steve B]

Any word on previous work?

Got service history in front of me last service says 73000  7/10/14

Looking back in service book.. only plug change in there is at 53000 14/6/10   main dealer

[Steve B]

James Do you think the foreign Objects Had to be harder than the surfaces that have been damaged

The electrodes on a spark plug could easily do that as they and the pistons are steel, whereas the head is soft as toffee aluminum

And what possible situation could there be where 3 electrodes have all came off 

Crap plugs 

That said, mine were GM twins... but all were loose after only 500 miles. So wonder if the electrical issue causes it to run lean, knackering the plugs due to a weak spark, leading to them going brittle and falling apart...

Anything in your history regarding investigative head/cam work? For the cam caps to be fitted wrongly to wear as they have (as per Marks suggestion), could the cams have been removed to check the lifters?

If the only cam history is when you put the car in for a cambelt/service, how long did they have the car for? Someone might have been trying to hide summat

The cam shells were all in the correct orientation and positions when we stripped it..

Even if it were three plugs that failed...

The question remains unanswered - why was this car having no problems prior to the Cambelt/service/camcovers/stat work - and making nasty metallic noises + misfiring the minute the key was turned after the work?

I'm only asking the question for one reason - to get to the bottom of the fault.

It's just too big a co incidence IMHO that it was fine before the work and so rough straight after

On that one james.. it was clearly a Knocking noise like a weak lifter

[05omegav6]

But even if the cam shells had been fitted wrongly in the past. Still nobody knows - why was it fine before the recent work, and fubar'd immediately after?

Co incidence?

Plugs not properly tightened, loom breaking down causing weak sparks, 642 is the order of the injector SUPPLY coupled with the relative extra heat in that side of the engine bay (left side is very cluttered) all adding up to electrode damage which results in plug disintegration and the debris damage witnessed.

When my plug disintegrated, I was in third, hammer down joining a motorway, the bang and subsequent misfire was quite unsettling

[05omegav6]

Any word on previous work?

Got service history in front of me last service says 73000  7/10/14

Looking back in service book.. only plug change in there is at 53000 14/6/10   main dealer

Who fitted the plugs recently? And what plugs were fitted?

[Steve B]

Any word on previous work?

Got service history in front of me last service says 73000  7/10/14

Looking back in service book.. only plug change in there is at 53000 14/6/10   main dealer

Who fitted the plugs recently? And what plugs were fitted?

do you mean when i had belt and all done

[05omegav6]

Yup

[Steve B]

Yup

Darth Loo-knee 

The plugs that came out were good and could of stayed in But they were all replaced with twin electrodes GM..

[05omegav6]

Yup

Darth Loo-knee 

The plugs that came out were good and could of stayed in But they were all replaced with twin electrodes GM..

Are these still intact?

[Steve B]

They are all perfect

[JamesV6CDX]

Yup

Darth Loo-knee 

The plugs that came out were good and could of stayed in But they were all replaced with twin electrodes GM..

And this Is what I don't get!!

Car is running fine, no issues

Car has belt, camcovers, plugs and stat done

Car then immediately has a misfire which is since found to be very poor compression on one bank

Is there any relevance in the fact this happened immediately after the key was turned following servicing work? Or is this a red herring / big co incidence

I'm not suggesting anything. As it may well be co incidence.

I just need to get it straight in my head because other than the little bit of inlet valve damage all seemed ok 

[chrisgixer]

246 coil pac ok? Any damage? (I'm sure you would of checked, but it would run on 90psi compression, until, possibly, the spark got weak...? )

[JamesV6CDX]

246 coil pac ok? Any damage? (I'm sure you would of checked, but it would run on 90psi compression, until, possibly, the spark got weak...? )

Coil pack changed as part of the elimination process before I got there mate : y