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  #1  
Old 05-02-2012, 08:33 AM
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Brake Booster Vacuum Leak Cause Turbo Power Loss?

My brake booster has developed a small leak and will be replaced soon. Meanwhile I have noticed a slight decrease in turbo boost and slightly sluggish revving. Could a leak at this location affect the turbo signal?
Subtle hissing from the booster at shut down for about 15 seconds.

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Old 05-02-2012, 10:03 AM
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I cannot imagine how.

Your fuel delivery is governed by mechanical linkages to the injection pump. Fuel augmentation for the turbo is prompted by a pressure line from the manifold over to the ALDA on the pump. Pressure, not vacuum, as this is a diesel.

Did you recently do any work under the hood that could have disturbed or damaged any of the vacuum lines, connectors or the plastic line running into the ALDA?
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Old 05-02-2012, 10:39 AM
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Old 05-02-2012, 10:52 AM
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I checked for loose connections. The ALDA set up is fine. No clogging. All filters were changed, valve adjustment was done 5000 miles ago. My fuel pump looks old and worn but no stalling- unless it not that bad yet. I usually can diagnose these cars pretty well but this situation is driving me crazy.
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Old 05-02-2012, 10:55 AM
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Install a boost guage at the ALDA connection on the pump, and see what you have when driving the car. If you cannot see 9-10 PSI, you have a problem.
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Old 05-02-2012, 11:03 AM
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Good idea. I will.

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