f you experience a sudden loss of power or erratic behavior, your turbo boost pressure may the culprit.  Before you start checking all the vacuum
lines and the turbo air lines, check on your waste gate servo valve link rod. If you have symptoms that result in an engine that runs just fine except for
low boost and no HP, or if your boost gage jumps all over the place read on.
 
Under normal conditions,at full boost the boost gauge should be almost to the end of the white bar, fully clockwise. If under full throttle, the gage only
goes to the 12 o'clock then the waste gate is fully bypassing.  If the boost gage is all over the place then your gate valve may be swinging in the
wind.
 
To find out if your waste gate servo link has broken away from the waste gate valve do as follows.
 

  1. face the engine, and on the drivers side by the fire wall you will be able to see the vacuum actuator to the right of the heat shield.
  2. locate the rod sticking out of the unit, it disappears under the heat shield.
  3. wiggle the rod. If it is solid then you should be fine, if it moves around then the rod has come free
  4. A 2 inch x 3 inch makeup mirror held at the correct angle will also let you see beneath the heat shield to verify the situation.
  5. to remove the heat shield, there are 5 bolts involved. Only do this with the engine very cold
  6. On the drivers side of the heat shield is a bracket held with two bolts, 10 mm heads, remove them.
  7. This will expose another bolt, remove it.
  8. On the passenger side of the heat shield you will find two bolts, each with a spring beneath the head. Remove the LOWER bolt.
  9. The heat shield should now be free, and by moving it down and to the passenger side you should be able to get it from beneath the turbo
       water cooling line.
 10. the turbo and the waste gate control arm are now exposed
 11. rotate the arm counter clockwise and engage the pin on the arm with the hole on the end of the servo link rod. The waste gate arm should
       move very easily as you do this.
 12. DO NOT lubricate anything, any lub will only burn and char.
 13. there appears to be no pin or clip to hold the servo rod onto the waste gate arm. I put a few turns of  copper wire around the pin to keep things
       in place
 14. This is now your opportunity to visit another thread on the Brick and adjust your boost by shortening the length of the servo rod.
 15. put it all back together.
 16. my turbo is '95, 850, 350,000 km, and this is the only issue I have had with the turbo.

 
 
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Kindest Regards:
Richard Baumann
VP-Engineering Hardware
905 643 9700 ext 227

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