Skip the auto shop - Our mechanics make house calls
  1. Home
  2. Articles
  3. How to Replace an Exhaust Gas Recirculation (EGR) Vacuum Modulator

How to Replace an Exhaust Gas Recirculation (EGR) Vacuum Modulator

egr vacuum modulator

The exhaust gas recirculation (EGR) system introduces exhaust gases to the engine combustion chamber to lower temperatures. This helps to reduce oxides of nitrogen (NOx) emissions, which are smog-forming pollutants.

The heart of the EGR system is the EGR valve, which can be either electronic or vacuum controlled. The EGR valve is used to meter exhaust gases into the engine. On some systems, the EGR valve is regulated by a vacuum modulator. The modulator precisely controls the strength of the vacuum signal to the EGR valve by referencing exhaust back pressure or engine load.

The typical symptoms of a bad EGR vacuum modulator include stalling, surging, rough idle, increased emissions, and an illuminated check engine light. If you notice any of these symptoms, you may have to replace the EGR vacuum modulator.

Part 1 of 2: Locate and remove the EGR vacuum modulator

In order to safely and efficiently replace your EGR vacuum modulator, you will need a couple of basic tools:

Materials Needed

  • EGR vacuum modulator
  • Free repair manuals - Autozone
  • Protective gloves
  • Repair manuals (optional) - Chilton
  • Safety glasses

locating the EGR vacuum modulator

Step 1: Locate the EGR vacuum modulator. The modulator is typically mounted near the EGR valve on the intake manifold.

modulator with labeled ports

Step 2: Disconnect the modulator vacuum hoses. Typically, the modulator will have labeled ports. Label the vacuum hoses for reference during installation of the new modulator.

Disconnect the vacuum hoses by carefully sliding them off the connections.

removing the modulator from its mounting clips

Step 3: Remove the modulator from its mounting clips. Pull the mounting bracket clips apart and remove the modulator.

Part 2 of 2: Install the EGR vacuum modulator

installing the new modulator

Step 1: Install the new modulator. Install the new modulator in the mounting clips.

tightening down the fasteners

Step 2: Put back the vacuum hoses. Reinstall the vacuum hoses in the exact order in which they were removed.

If you are not comfortable with performing this process on your own, get a certified technician from YourMechanic to replace the EGR vacuum for you.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P0222 OBD-II Trouble Code: Throttle/Pedal Position Switch/Sensor B Circuit Low Input
P0222 code definition Throttle/Pedal Position Switch/Sensor B Circuit Low Input What the P0222...
The Traveler’s Guide to Driving in Malaysia
CraigBurrows / Shutterstock.com Malaysia is a popular destination for many tourists today. The country has amazing sights and attractions that you will want to explore....


Related questions

Q: Abs module is no good. I have another one from junk yard with the same year and FWD and engine. Will it work?

Hi there. As long as the ABS module is the same design and has the same ports on it then it will work just fine on your vehicle. Be sure to bleed all of the brake lines after replacing the...

Q: Accelerating problem.

If you are having an acceleration problem then you should first have the computer diagnosed to see if the throttle position sensor is not stuck at idle position. The throttle is electronically controlled and will not allow acceleration if there...

Q: Difference between egr valve and egr valve pressure sensor

Hello, thank you for writing in. The EGR valve (exhaust gas recirculation valve) takes exhaust emissions and recirculates it back into the air intake as to lower toxic emission levels. The EGR valve itself is pressure regulated, and needs some...