Tag: Vacuum Line

Turbo S80 TCV & Vacuum Line Routing

The pressure from the outlet of the turbo presses on the wastegate diaphragm to keep it closed. When the ECU decides there is enough boost, it stops allowing the air from the turbo outlet from going to the wastegate actuator and allows it to go to the compressor inlet tube. The system is a pulse width modulated system meaning it is never “always on”, but instead cycled on for longer periods of time to increase boost, and shorter to decrease boost. When the TCV is off, air from the compressor is dumped to the compressor inlet, and the spring pressure in the wastegate is what regulates compressor outlet pressure.

MVS logo - fist holding a wrench

DIY Smoke Tester Tool

Long ago someone, somewhere, discovered that vacuum leaks can found more quickly by using smoke. Smoke will be pulled into a crack on a vacuum line. Just run the engine, create smoke, and watch for it getting pulled into the affected area. Whoa, things just got easier. (Read about other ways to find vacuum leaks.)

Diy Fpr Vacuum Line Replacement -

Fuel Pressure Line Replacement

MVS Contributor jreed hits it out of the park with a DIY on an overlooked vacuum hose: “I was out looking around in the engine compartment (97 855 GLT with ~162k miles) for opportunities to fix something this morning. I’ve already replaced most of the vacuum lines in the car, but I found a short crumbly vacuum connector that I had overlooked the last few times I checked the car. This connector is located above the transmission, near the lower radiator hose. It is part of the Fuel Pressure Regulator line from the intake tube near the MAF Sensor and connects between a white hard plastic line and a metal line that runs over to the fuel pressure regulator on the passengers’ side.”