[Biturbos4] Turbo reliability

Philip Pace pjpace at yahoo.com
Thu Sep 22 22:17:36 EDT 2005

Update - I finally drove my car again and gave this a shot. Bingo - you won the big
prize!!! While it seems simple, I wish the tech I took it to a few months ago had a
clue. :-/

Many thanks for another problem you've helped solve, Keman.

--- costco <keman at interwolf.net> wrote:
> Pinch the two hoses (one at a time with either strong fingers or a pair of
> needlenose pliars) leading to your bypass valves under the center engine
> cover (the one that says biturbo v6). Stock, one is fabric covered, one is
> rubber, the valves face away from each other. The hoses are roughly 3/8"
> in diameter and fairly short. The bypass valves themselves are shiny
> plastic P looking things. You'll see them right away when you remove the
> engine cover.
> If the noise you describe goes away when you pinch one of those lines
> shut, that particular bypass valve is toast and needs to be replaced.
> Better to replace them by the pair. They fail often, even the improved
> models.
> - Keman
> On Tue, 30 Aug 2005, Philip Pace wrote:
> > <breathes giant sigh of relief>
> > That's the setup I got, but now it's making an obnoxious noise at idle. If you
> make
> > a dial tone noise, that's about what it sounds like. Thoughts? It goes away on
> > boost, and is most noticeable after the car was running, turned off for a bit,
> and
> > then started again. If the oil temp gauge settle back to 150º, it doesn't make
> the
> > noise on startup at that point.

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