The 6.5L EFI diesel turbocharger provides a variety of benefits. It increases engine response time and power, while also reducing exhaust emissions.
When the pressure of exhaust gases entering the turbo charger exceeds specified levels, these gases are by passed directly to the exhaust pipe. The turbocharger uses a solenoid-controlled wastegate valve (figure 3-2) to accomplish this. The valve acts like a turbine wheel speed governor to limit the maximum amount of turbo boost pressure to between 2 and 8 psi.
As part of PCM engine management on the 6.5L EFI diesel engine, the wastegate valve is controlled by a solenoid. The solenoid is located on a bracket at the rear of the left head.