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2.6 V6 Intermittent Starting and Rough Running

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Fuse:
2.6 V6 had been standing for a couple of months and wouldn't start. Battery charge fine, turned over fine but dead. Looking on OOF immediate answer was crank sensor - changed for Bosch unit (Lucas unit present) and lo it started.

Since then it has messed about - rough running, not starting sometimes - generally not a great confidence booster.

After the last episode following codes read

P0500-4 Vehicle speed sensor malfunction
P0500-C Vehicle speed sensor malfunction
P0300-1 Random/multiple cylinder misfire detected
P0306-1 Cylinder 6 misfire detected
P1612-0

Any wise words where to start looking next? Any connectors that may need breaking and cleaning and if so where are they? Could the ECU be faulty?

Any opinions welcome as even my Fiats didn't behave as badly as this V6!!

John.

grifter:
Could be worth checking for oil in the plug wells as a start, pointing to leaky rocker covers, then requiring a full clean of the breather system and new rocker gaskets etc.

How old is fuel in it? A fuel filter change wouldn't go amiss if you don't know when it was last changed. Also worth clearing the fault codes and seeing what comes up again, as those could be old stored codes. Disconnect battery for a bit to clear them.

Nick W:
I'd be investigating the cylinder6 misfire before doing anything else. Which probably means fixing the leaking cam cover gaskets, water dripping from the scuttle and replacing the coil pack damaged by those.

Fuse:
Thanks for the input. At last got a dry and warmish day to investigate (my friend has a garage but like most people it is full of other stuff and no room for the car!!).

Cylinder 6 spark plug well full of oil with a sub layer of water. Coil packs both sides showing signs of rust.

So following the superb guides in the How To section cam covers are off on the passenger side. All bolts were no more than finger tight. Replaced the cover washers with o rings (they were flat and hard!) but ran out of time to do more.

So while I'm in there it looks like new plugs and coil packs!!

Doctor Gollum:
Welcome to the Omega :D

Make sure that you thoroughly clean the breathers as per that guide too, otherwise you will be doing the job again by the end of the year.

Presumably you have fitted/will be fitting new camcover gaskets as part of the job...

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