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[daveo_007]

Evening to one and all,

I'm kind of hi-jacking the forum as I'm not an Omega owner but have had the pleasure of getting very well aquainted with a friends Omega.

The vehicle in question is a 2003 Omega 3.2 V6 automatic, it came to me feeling a bit sorry for its self, she had mayo in the oil filler cap and dip stick and was smelling hot and of burnt oil.

I have removed both heads they have been given a very light skim and you can see staining where both heads had bled between the oil and water galleries at the rear of both heads. There was a large amount of what I describe as coolant corrosian, the white and red powdery build up from the antifreeze this seems to have caused the leak??

Anyway with the help of a Sykes Pickavant Vauxhall cambelt timing alignment kit I have rebuilt the top end replaced all the rubbers and gaskets checked and cleaned all the breathers used this site to verify and check all the vacuum pipes and breathers are in the right places BUT...

I started her up and she missed a bit, I did the pedal trick and got a list of fault codes as long as my arm, at least 10, anyway after thinking about it and reading some more posts I pulled the connection off of the MAF sensor and it ran far better. I disconnected the battery and reconnected it and then got down to four codes
P0340 Camshaft Position Sensor
P0300 Random Misfire
P0100 Air Mass Flow sensor
P0110 Air Intake something or other

So I then took the camshaft sensor out but kept it connected, I left the MAF sensor connector off and it ran a bit sweeter but idled like a pig, conducted another pedal test and I got just
P0340
P0100

Is it really going to be these two items playing up, there were no issues like this before I did the gaskets, but i didn't know about the pedal trick so didn't know if there were any codes before hand.

It seems straight forward but why would they fail just from being removed and then refitted or is it an old Vauxhall thing!!!

Anyway thanks for reading all the way down to here those that have and thanks to all those many many posts I've read whilst in the garage scratching my head with my iphone google and OOF in hand...

Any help gratefully appreciated,

on the side of this the gearbox breather pipe gave me an issue can anyone tell me where it should sit, currently I have it coming up by the 2 4 6 head at the back by the bracket attached to the rear of the head for engine/head removal and it is open to atmosphere is this correct?.....

Thanks

Dave

[05omegav6]

Firstly, gearbox breather vents to atmosphere.

Renew the crank sensor with a genuine Vauxhall one from a genuine Vauxhall dealer that you genuinely have to go to to collect.

Then try unplugging the Maf sensor. If it runs better, replace that too... genuine Bosch or genuine Vauxhall, anything else won't last.

Sorry to disappoint you, but pulling the heads was potentially unnecessary... mayo in the filler cap is classic crap oil/short journey/crap servicing and not a symptom of HG failure.

Burnt oil smell is a direct result of cam cover seals failing and oil draining onto the exhaust manifolds and burning off. Again a side effect of crap servicing, probably Vauxhall main dealer...

Hot engine is classic 3.2 as well... the residual heat after even a short run is enough to warm a small barn for a week...

[Webby the Bear]

Everything what 'e said.

At least having done a strip down you've changed all the seals. Piece of mind at least but potentially unnecessary as Al says.

[chrisgixer]

If yours has a fixed bottom pulley, it might be tricky to get the cam timing accurate after the head skim. As the belt run is that bit shorter. It's unusual for the HG to fail on the 3.2 as they have metal gaskets rather than the composite ones of the earlier 3.0

But there's a good chance the crank sensor is playing up. They are known to throw erroneous codes, but not 0335 cs code. Although sometimes they do, obviously.

Cam sensors never seem to fail, (but the wire sometimes gets trapped on rebuilds) although maf's do, although less common that the 2.6.

On skimming through the post I was thinking crank sensor. On reading properly, still crank sensor. It might be worth using the car for non essential journeys and see if 0335 comes up, just to be sure. And if it runs well enough of course.

[daveo_007]

Thanks guys,

Did you mean cam sensor or crank sensor?? As the code coming up seems to point to the cam not crank sensor...

also is it normal for both of these to go when all that has happened is they have been removed and then refitted??

I've not come across this before on any other vehicle I've worked on...

Lastly anyone know of the resistive values or have schematic diagrams for wiring to check continuity  of connectors/sensors?

Dave

[05omegav6]

Crank sensor is practically a service item, and doesn't always throw a code... Route the new one as per the guide.

V6 Cam sensor is generally reliable, but I have changed a couple... known good second hand will suffice for testing purposes, and takes all of two minutes to change

[chrisgixer]

Cam sensor. Never fails on the v engines, but cable does get trapped.

Crank sensor. We get threads on here about this ALL the time. More common than maf.

[chrisgixer]

Too slow

[daveo_007]

Chris you posted as I was typing out my post. I take it the crank sensor is the one by the crank, near the front pulley. I hadn't touched that so will take a look at that tomorrow after a 12hr shift...

[05omegav6]

Chris you posted as I was typing out my post. I take it the crank sensor is the one by the crank, near the front pulley. I hadn't touched that so will take a look at that tomorrow after a 12hr shift...

Crank is next to oil filter, easily accessed from underneath... plug is into end of cable tray above 246 coilpack plug.

Cam is on the pulley end of the inlet bank of the 246 head, plug next to aircon pipe bracket. Can just about be done without removing the plenum...

Both E8 torx bolts

[daveo_007]

Thanks, I may well have unplugged the crank sensor unknowingly when I cleared the wiring harness to take the heads off.

Another thing to check in the morning
 

[dbug]

Cam sensor. Never fails on the v engines, but cable does get trapped.

Crank sensor. We get threads on here about this ALL the time. More common than maf.

Had a failed cam sensor on the 2.6 v6 when we first got it.  Vx dealer replaced crank sensor, but didn't cure fault.  Then they  replaced cam sensor, problem cured.  cable was not trapped.  All done under warranty. Reported before on OOF

[chrisgixer]

Of cause there always ONE smart arse.


The point is, obviously, that it's more likely to be the crank sensor. By a distance.

[dbug]

Of cause there always ONE smart arse.


The point is, obviously, that it's more likely to be the crank sensor. By a distance.

uncalled for and rude. only reporting fact to help op.  you stated never and thats not the case.

[chrisgixer]

Never apart from yours then.