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How to Install Blow Off Valves

by Alibaster Smith

A blow off valve is a device that allows recirculating air to exit the intake/exhaust system on a turbocharged vehicle. Without the blow off valve, air would be forced back into the turbocharger's compression wheel when the driver's foot is taken off the accelerator, causing undue stress on the turbo's components. This, in turn, slows turbo spool up time. Over time, this could cause the turbo to fail. Installing a blow off valve gives the air a place to go and relieves pressure from the turbo's compression wheel during gear shifts (when the driver's foot is off the accelerator).

Step 1

Open the hood and disconnect the negative cable from the battery terminal. Disconnect the positive cable from the battery terminal.

Step 2

Remove the battery.

Step 3

Locate the factory recirculating valve. Use your shop manual if you need a visual description for the valve specific to your vehicle. This valve recirculates the intake air to the exhaust. This is the device we want to replace. There will be two hoses connected to vacuum lines. The top vacuum line is connected to the throttle body after the intake. This vacuum pressure is what makes the valve operate.

Step 4

Use either a screwdriver or socket wrench (either should work) to remove the screw bolts on the hose clamps.

Step 5

Slide the hose clamps out of the way and use the screwdriver to pry both the vacuum lines off.

Step 6

Install the new blow off valve. Install the hoses the opposite way of removal.

Put the batter back in and reconnect the positive cable to the battery first, then the negative cable.

Items you will need

  • Blow off valve
  • 3/8 socket wrench with socket set or screwdriver
  • Pliers
  • Vehicle manual

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