Needless to say, while it's at this stage, I will be doing both HGs.... crazy not to while 1-3-5 is so accessible.
1-3-5 gasket, was equally as bad - although not leaking externally like 2-4-6.
Thankfully no damage to the heads or the block - no corrosion or pitting to be seen.
I think I may have found a few potentials for the lambda issue too.
Firstly, the "three" earths, on the rear of the 2-4-6 head, had all had their ends cut off, all twisted together, and crimped into one ring connector - so someone has bodged that, for reasons totally unknown! One of them was totally shileded - so not doing it's job at all.
There is a pattern cat on the 1-3-5 bank, and it sounds nasty - free to a good home, if anyone wants it.... it will be replaced with a known good GM item
The O2 sensors don't look geniune - they have the right connectors, however, I can't see any GM markings on them - so this may also be the issue - Omega doesn't like pattern lambdas....
Oh - and someone had put the drivers side camcover gasket on with a pattern gasket, and a load of bathroom sealant
Goes to show, when there is one issue - best just to do the whole lot in one hit...
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Topic: MV6 - who says V6 Head Gaskets never fail?! (Read 6680 times)