Volvo 850 Made from 1993 to 1997, this Volvo line was available in both a wagon and a sedan, both with were graced with several trim levels.

Boost, boost, boost.....

  #1  
Old 03-27-2010, 10:32 PM
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Default Boost, boost, boost.....

Hey all. My 96 855R is acting up. Never had any real issues with boost, but now its acting strange. I thing the Wastegate actuator is shot perhaps. See my sig for mods. I normally run around 15-16lbs of boost on an IPD ECU. Tee other day it just quit making full boost. Now its hitting like 8 or 9 and just fading out.... its so sad! Ive checked all connections ( vac lines, rip kit clamps ect ) I have swapped for a spare BCS and reset the ECU and i get the same results. My suspicion is that the wastegate actuator finally gave up the ghost and its time for new one. Any basic tests to confirm? Thanks! ( oh, also, about a year ago, i was trying to build up boost levels and i just couldn't get above 12psi, I ended up cranking up that wastegate rod till i got what i wanted ( 16 lbs) This is one reason im thinking its been on its way out for a while.

- Grae
 
  #2  
Old 03-27-2010, 10:36 PM
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Intercooler hose have a hole in it?
If the waste gate was not working at all you would have full boost at all times.
 
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Old 03-28-2010, 01:13 AM
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What if the wastegate was letting open too much/ too soon? Could that happen?
 
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Old 03-28-2010, 08:06 AM
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Yes it could. But I would check all your hoses and intercooler first for issues.
 
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Old 03-28-2010, 11:25 PM
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Whats the best way to check the intercooler, yank it out and pressurize it?
 
  #6  
Old 03-28-2010, 11:41 PM
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Check the plastic tanks for cracks.
 
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