Ok, so I’m having a problem with my 2012 Volvo semi. Had truck put in shop multiple times over the past 3 months with the last time resulting in transmission replacement. The issue it’s giving me is when cruising...70-73mph, I lose boost/acceleration. The speedometer drops immediately by approximately 15-20mph but will resume acceleration shortly after. Any ideas of what’s going on?
Volvo 2012 loosing boost/acceleration at 70-73mph.
Discussion in 'Volvo Forum' started by Slimken, Dec 14, 2018.
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I believe Rob is right, Could be turbo or actuator , intake leak above certain boost presure, like a drive axle air spring leak, won't hold heavy trailers.
Back in June 07, I purchased my last truck, new 780 ,2008 with D13, I was used to run my pre-emission 770 with D60, 70-75 mph, but this motor doesn't like speeds above 65 mph and mountains , I was in shop every week in first months, the motor is running hotter , emission system has a certain limited capacity to optimally process smoke; faster you run, sooner gets clogged , the DPF , egr cooler, venturi, sensors . I'm governed to 65mph(Ontario laws
), running mostly about 62-64 mph, but actually helps with maintenance , fuel economy and road safety.
Last edited: Dec 16, 2018
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