7749 Turbo Sunbird Diag help needed.

[Bruce]

How about the rubber band?, err timing belt, maybe jumped a tooth?.
Bruce


----- Original Message -----
From: <ECMnut at aol.com>
To: <gmecm at diy-efi.org>
Sent: Saturday, June 30, 2001 2:09 PM
Subject: 7749 Turbo Sunbird Diag help needed.


> After years of playing with the syclone.
>  I finally got to work with a 89 Turbo Sunbird. (same ECM & code).
>  I didn't even have to change the default Syclone VIN setting
> in my diacom.   I was curious if any listers have played
>  with the T-Sunbird.  My freind who owns it, recently replace
> a siezed turbo, and still can't get more than 1-2psi of boost.
> After years of turbo tinkering, I thought "this will be EASY"..
>  " I AM TURBO STUD!"    (yea-right)
> Just for diagnostic purposes, I pulled the hose off the
> wastegate actuator and disconnected the exhaust down pipe,
> in an attempt to get more boost.  Now 2-3 psi.  I reconnected the
> exhaust and it went back to 1-2 PSI.  The turbo, cat & exhaust
> are almost  new.  The wastegate duty cycle in the  data stream
> is being held at 100% by the ECM, becuase the limit of 7psi is
> never even remotely being approached.
>   I've confirmed the  wastegate flapper is staying shut and
> I eliminated the exhaust system as a possible cause by
> opening the downpipe..  I also pulled out
> the air cleaner element tempoarily.  No change noted.
> I also remove and inspected the turbo to TB pipe, fittings & clamps.
> Any ideas would be appreciated.
> Mike V    no longer turbo stud
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