I have a 2012 6.7 3500 6 speed cummins that I am currently going through this problem. I was driving back from location to camp and the truck fell on its face and acted like the turbo was not spooling, and it sounded like the exhaust break was running?? i tried to dribe and all it did was dump out smoke the truck has all deletes.
Take a look at the 2 video clips, the turbo boost doesn't hold, it spikes then falls down on its face. Also checked the movement in the wastegate on the other video. What do you guys think? It's crazy because I had all these problems before the 100k mile warranty expired, now I'm at 129k and know what the dealer is going to say, out of warranty!
Maxxforce 7 Turbo Waste Gate Repair. August 28, 2014 There were no problems on the road test so the bus is ready for the road. All said and done the parts were expensive but there's a valuable school bus that needs to go back to work.
A blow off valve (often called dump valve) is located between the turbo compressor and the throttle. As the turbo is on boost, the intake system will become filled with pressurized air from the turbo compressor. Blow off valves will release this pressurized air and makes a desirable hissing noise.
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Freightliner turbo boost cuts out Posted: Wed Apr 23, 2008 11:12:54 AM. I have an 04 Freightliner Columbia. When I first get on the road my turbo boost will cut out for 15-20 min at a time, then will come back on and work good until I stop for fuel or food etc.