[V8] Smoking V8

Buchholz, Steven Steven.Buchholz at kla-tencor.com
Thu Jan 18 12:13:42 EST 2007

... I don't know that I'd agree with the head being that common a source except on specific models prone to head sealing issues.  I've been told that typical sources for oil smoke are oil getting sucked past the intake valve guides and oil getting past the piston rings.  The V8 has a oil recovery demisting chamber under the intake manifold ... I've had a theory that oil can get sucked into the intake via the demister ... never proved it out though.  On #344 I had occasional puffs, sometimes on cold start in the morning and sometimes on hard accel ... a can of Sea Foam seems to have cured this issue on the car.  

BTW, there is a discussion of this topic in the Audifans KB ...

Steve B
San José, CA (USA)
> By the way, did you have any more thoughts on the oil burning with my
> V8, or is it something that you have to look at close up?
> Interestingly I read an article from a British car classic magazine over
> the weekend, they were comparing Jaguar Mk 2 and Daimler 250 sedans, and
> in it they indicated that oil burning on startup was usually poor valve
> stem seals while oil smoke on light acceleration was due to a head
> problem. Now this seems very close to what I have going on where I don't
> actually get a puff of smoke on the startup, but a couple of seconds
> afterward, and then more smoke as I accelerate. When the V8 is actually
> running at steady speed there doesn't appear to be any smoke coming from
> the tail pipe.
> Do you think the author is mistaken in his analysis, or can the heads
> cause that sort of problem on acceleration?

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