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Shibe

Overboosting to safety/fuel cut

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Sort of asking on behalf of a mate here.

Took his 09 S-GT Impreza for a drive, third gear pull and the car is boosting to about 4-5psi over the factory boost of 14psi. Then i'm assuming the ECU hits a safety mode and cuts the fuel as it refuses to accelerate after a certain point. He said this has started happening randomly and never used to do it. 

 

Any quick ideas on what this may be? 

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Sounds like it is freeboosting, ie no boost control.

 

Check vacuum line to the wastegate is not split, also any of the other vacuum lines to the boost solenoid. Check the wastegate can be pushed opened by hand if you push the rod (will take a fair effort because of the spring). 

 

Could be caused by something else but that is a good place to start.

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