BPV Symptom?

[Brett Dikeman]

At 7:47 AM +0200 4/7/03, Richard Tanimura wrote:

>Good stuff. I never even knew there was throttle cleaner. Geez, I bet you
>are one of those guys who has 5 different kinds of toothpaste depending on
>what you ate for dinner :-)

Nope, I just remembered someone else telling me to use throttle
cleaner when I went to the parts store looking for a good cleaner :-)

>So brake cleaner is no-no?

It's way too aggressive, yes.

>  Also no lubricants?

I'd say no.  The valve isn't lubricated from the factory(I don't
think) on the vane part, and I think that's because clearances are
sufficient to not require it.


>BTW, I was amazed how much crud there was in the ISV and throttle. Is it
>coming in from the IC or regurgitating from the intake manifold? Any
>theories?

Crankcase breather.  On rare occasion, the turbo seals...but it's
pretty hard to tell since the crank breather exhausts right smack
into the turbo outlet.

There are a couple of solutions:
-vent the breather to atmosphere(big no-no emissions-wise, there's a
reason the crank is vented back into the intake- to reburn all the
nasties)
-install Total Seal rings to drastically reduce blow-by
-install oil separator(there is in fact one VW used on diesels or
something- I'll have to look back in my email to get the details from
a fellow lister, might be NLA)

Things that will aggravate the problem:

-overfilling the engine with oil- don't fill up to the max mark, it's
"max" for a reason, not "fill to here"  :)
-overdue air filter
-excessive blow-by
-chip

B
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