I have an 82 300sd turbo diesel. There is a solenoid mounted near the driver side firewall that my local mechaniic said was safe to just always bypass. One mechanic said it is electrically activated by a signal from a pressure sensor on the intake manifold that senses intake air pressure or vacuum. With this solenoid bypassed I have an air hose always running from the intake manifold air to the injectors pump. What is this solenoid called? What does it do and is it safe to leave it bypassed?
He said he had to bypass this solenoid that is always clogging up so that my transmission will shift smoothly and it sure does shift a lot smoother now but I want to know what the solenoid is for. They have 2 mechanics and each told me a different story of what the solenoid did.
thanks, George