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85 5KCST Boost problems intensify
Hello to everyone again. I would like to thank everyone who replied to
my first message about the check engine light on my Turbo 5000CS.
Unfortunately, the problems have gotten worse. A few days ago during
the cold snap, I started the engine to find that the boost gauge was
registering 0.0 bar. The engine seemed to run normally, but without the
feeling of the turbocharger. I drove the car for a few miles and
suddenly, hitting a bump in the road, the turbo seemed to "click in".
With a vengeance, as I briefly saw 1.6 bar on the boost gauge and the
car felt like it had doubled its power.
The next time I started the car, however, the boost gauge again
registered 0.0 bar, where it stands now. Also, the check engine light
continues to come on whenever the engine surpasses 3,000 rpm; it
switches off when the rpm's drop.
A local mechanic suggested that the turbocharger might be stuck,
refusing to turn except when "broken loose" by a bump. How can I
determine if the turbocharger is spinning? If it is truly stuck,
wouldn't this affect the smooth operation of the engine (the car is
perfectly drivable now, just not as powerful)? If it is spinning, why
would the boost gauge register 0? Finally, if the turbo is shot, can I
purchase a rebuilt one or have mine rebuilt and what is the approximate
cost of this?
I know this is a lot of questions but I would really like to pin down
the source of this trouble as the rest of the car runs and looks
terrific. Thanks in advance once again for any suggestions or comments.