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[brian36]

hi, need help to fix my 2.6 mv6 it's been throwing up faults and today managed to find out why.
short story,
misfire no 5 knock sensor fault, replaced coil packs both sides and spark plugs also changed crankshaft sensor.
so today mechanic checked compression in no 5 found to be about 75 and low, so then he took out spark plug and sent camera down to have a look and after saying oh a few times the stating won't be cheap he told me that I had a burnt valve in no 5. he told me engine would need to be stripped down etc. now after picking myself up from the floor I am now in a awkward position of what to do?. I do not have a lot of finances and need a car I am open to good suggestions and hope there are members out there that fancy doing this job for me. I live in fife but in next 2-4 weeks will be moving hopefully to Milton Keynes,i don't mind leaving car for someone to fix in own time, will just use bus. is there any chaps out there that can help?   

[05omegav6]

Changing what you have, does it still misfire

[biggriffin]

Has the knock sensor been over tightened.
also never known a omega to burn a valve, bend them yes.

[albitz]

Never heard of a burnt valve in a v6 either. Anythings possible though. I would get hold of a compression tester and check it for myself.
If hes right,then Darth Loo-knee is the man for the job imo. Hes in Stoke.

[JamesV6CDX]

I'm not far from MK (half hour or so) if you can get the thing down here?

[biggriffin]

Serek only 45mins from mk in Huntingdon,give him a pm.

[brian36]

thanks for replies,
regarding misfire yip still there after changing all things.
as said today had car down garage he tested compression said low no 5.
any ideas cost involved in doing this? I guess head gasket kit,do belts same time and valve of course thanks

[JamesV6CDX]

The investigation will cost you nothing.

Parts wise, new gaskets recommended for hg, cam cover, exh manifold, coolant bridge, etc

So not nearly as expensive as you'd think

You could do both banks, but on a v6 the multi layer head gaskets never fail

The most important thing in this situation is finding out why the valve burnt (eg why that pot was running lean to cause it).

Doing the work is very basic, just a little time consuming to clean things up etc.

If you don't find our WHY it failed though, and remedy that, it will probably fail again...

[zirk]

Assuming it is a pitted Valve and not bent from its previous life, could be a failing injector causing it to miss fire and run lean or hot. 

[JamesV6CDX]

Assuming it is a pitted Valve and not bent from its previous life, could be a failing injector causing it to miss fire and run lean or hot. 

Yep. I'd suggest when it's running on all 6 again, live data is closely looked at for some time after...

[Marks DTM Calib]

My experience of burnt valves is that they actualy result in close to zero compression, and the compression test hints at a bit more than this. Never seen one on a V6, what year is it?, any sign of stem seal issues?

Also, having used endoscopes in the past, not sure how he got a view of the valve seat when poked in through the spark plug hole (small entry hole and having to view something behind the entry hole in a very small and confined space).

As already said, get it to Nottingham and leave it on the drive and I will have a fiddle.

[brian36]

ok will be in touch thanks to all

[albitz]

My experience of burnt valves is that they actualy result in close to zero compression, and the compression test hints at a bit more than this. Never seen one on a V6, what year is it?, any sign of stem seal issues?

Also, having used endoscopes in the past, not sure how he got a view of the valve seat when poked in through the spark plug hole (small entry hole and having to view something behind the entry hole in a very small and confined space).

As already said, get it to Nottingham and leave it on the drive and I will have a fiddle.

Brian - that's an offer you really shouldn't refuse.

[JamesV6CDX]

My experience of burnt valves is that they actualy result in close to zero compression, and the compression test hints at a bit more than this. Never seen one on a V6, what year is it?, any sign of stem seal issues?

Also, having used endoscopes in the past, not sure how he got a view of the valve seat when poked in through the spark plug hole (small entry hole and having to view something behind the entry hole in a very small and confined space).

As already said, get it to Nottingham and leave it on the drive and I will have a fiddle.

Brian - that's an offer you really shouldn't refuse.

Agreed

[brian36]

will do ,be in touch thanks to all