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[Vitaliy]

Hi
I am new to this forum, but not to Omega as a car or other manufacturers forums.

I need urgent advice - I got X reg Omega B facelifted V6 2.5.
I just changed water pump and both rocker cover gaskets as spark plugs were swimming in the oil. Car started and run beautifully with healthy sounding engine. I run it in place for 40 min., maybe more. No troubles, good sound, no overheating oil on cam present in sufficient quantity ( only the one you can see from oil cap), reved it up hard several times . I took it than twice around the block - I couldn't hear the engine, smooth gearchange ( its auto). The way it was driving i would give it 10 out of 10. Than I decided to floor it on a motorway - did 120 MPH without any trouble. than when I was cursing with around 60 back home - i was coming to the junction I had to take - so I released the throttle - for first 10 sec it was allright - but than - started sounding like as if tappets dont get sufficient oil.(I would say sound is coming from the inlet manifold assembly). and it is loud - slightly resembles diesel. still plenty of power, the cam that I can see from the oil cap is still oily as it was before.

Any suggestions please   

[Marks DTM Calib]

Let it idle for 10-15 mins and see what happens.

Has it had an engine flush recently or a good record of oil changes?

[Vitaliy]

yes- oil is reasonably clear and is not thin - it was supposedly serviced 2 weeks ago. and than - it wouldn't just go in one go i think - its as if something fell out of the engine. additionally if it was oil related I dont think i would see that much oil through oil cap.

[Abiton]

Exhaust manifold gasket leak?

I would have thought this would make a farty, blowy noise, but when ours went it was a really nasty metallic clack.

Just a thought.

[Vitaliy]

Thank you for quick replies.
I am going to the car to run it for 15 min and see what will happen.

Update: Didn't run it for 10 min - reason sligh misfire  that wasn't  there before the sound changed. with higher RPMs misfire becomes less apparent.

[Omegafantasy]

I get flashbacks when I read this 
I had this sound on my last engine and the reason was that the cambelt had slipped quite a bit, although mine did this at very low revs. Hope this isn't the case with yours!

Other reasons I can think of:
- Loose spark plug
- One-way valve for the SAI system broken and blowing exhaust into the rubber hose from the pump (or the hose is off)
- Leaking manifold

You say you've changed the water pump. I hope you did cambelt + tensioners at the same time while you were "in there"? 

[Vitaliy]

I didn't touch the cambelt. Previous owner had it changed by vauxhall 3 month ago and did 2K from then.

Edit: You say SAI valve - where is it ? - is it the thing-y thats in front of the auxiliary belt ?

[Omegafantasy]

Yep. One pipe from each manifold joined together in the middle by a valve. Mine popped off once and made a tappety sound, but not so very metallic though.

[Vitaliy]

If I cant figure it out tomorrow - will record and post the sound in here.
tomorrow in the agenda:
1. checking spark plugs,
2. checking SAI valve and related hoses
2. Oil pressure test
3. checking timing belt for slipping

wish me luck - I will need it.

[Omegafantasy]

Cheer up, it's usually my stuff that goes bad :p I'm not sure how much more I can take, hehe 

[alank46]

Hi
Was the tensioner changed along with the belt?  Its usually the tensioner that fails before the belt.
Alan

I didn't touch the cambelt. Previous owner had it changed by vauxhall 3 month ago and did 2K from then.

[Vitaliy]

I have no idea about the tensioner as I am new owner. car still runs. I looked at 3 accessible spark plugs and they are ok, no carbon deposit on them and definitely tight enough. I recorded the sound and will post it in a few minutes.

[Vitaliy]

What is this :


I Dont think I have seen this black spot before:


engine sound:
http://rapidshare.com/files/414248685/Sound_clip_05.wav

Sorry for the quality - couldn't find my camera so used my mobile phone.

[Omegafantasy]

Somewhat hard to tell from the sound there, but to me it sounds like dry hydraulic lifters.

[Vitaliy]

my point exactly, but sound doesn't vary with sides and the cam that you can see from oil cap is oily like it should be - so I assume that it has sufficient oil pressure for lifters. Another thing is that in my opinion sound comes from the inlet manifold (top part of it - i think you have a different name for it). Its too loud to be precise about it though.

Edit: What about that valve thingy - is it possible its responsible?