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Matt, Mechanical Engineer
Category: Car
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Experience:  BEng hons Mech engineering, in auto industry 22 years
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My Volvo s80 (2004) has been low on power. Put in an ERG

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My Volvo s80 (2004) has been low on power. Put in an ERG valve and tested a good airflow meter in it.
What else could be the problem?
Thank you in anticipation
Submitted: 10 months ago.
Category: Car
Expert:  Shantal-Mod replied 10 months ago.
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Customer: replied 10 months ago.
I shall continue waiting for a reply
Expert:  Matt replied 10 months ago.

Hello

This could be a lack of fuel pressure from the electrical pump at the tank.

If the connections to this are corroded or damaged then the pump could stop at any time or could not be running at full speed. Check that its relay switches in and out and the relay contacts are clean and bright – replace the relay if in any doubt and do the same for the fuse,
Ideally measure the pressure at the inlet to the main engine fuel pump and if this is low check the pump as described and also consider changing the fuel filter as if this partially blocked this too will reduce pressure.

If this is OK then check the small vacuum lines to the turbo and its connected control solenoid on the bulkhead, any cracks or leaks can give turbo issues and its best to have the boost pressure measured actually measured with a boost gauge to check that the turbo is healthy and that the sensor is reading correctly

If its a variable vane turbo (they’ll be an actuator on the turbo body - but not a wastegate) then check its vacuum pipework as above and check the connections to the diaphragm / solenoid valve

Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 21605
Experience: BEng hons Mech engineering, in auto industry 22 years
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