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Matt
Matt, Engineer
Category: Volvo
Satisfied Customers: 20969
Experience:  Mechanical Engineer with 20 years experience in the auto industry, 8 yrs in formula 1 engine testing
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Volvo 2015 s60 t5 Engine vibrates when excelirator is

Customer Question

Volvo 2015 s60 t5 Engine vibrates when excelirator is applied. It happens when power display on dash shows used power indicator gets close to available power indicator.
Submitted: 1 year ago.
Category: Volvo
Expert:  Matt replied 1 year ago.

Hello

this sounds like a turbo issue so 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

Also worth checking that the glow-plug relay is switching off as they can stick on and leave the glow plugs also on - on some cars this can force it into limp home

Also worth considering adding a bottle of injector cleaner into the tank as a clogged injector nozzle will reduce power and give poor combustion - the next stage on from this is to remove all the injectors and have them ultrasonically cleaned and flow checked

Also check all the high pressure hoses post turbo/s for any split hoses or cracked metal pipes, also check the ends of the intercooler as its not unheard of to pop the end caps off under high boost.