December 14, 2023

Acura MDX (2002-2017) Engine Light or Long Start? Here’s Why

Acura MDX evap check engine light or long start common Today, let’s look at a common problem that many of us face with our Acura MDX, specifically the models from 2002 to 2017, that may be causing an engine light or long start. I’ve encountered a persistent issue with the EVAP canister vent solenoid and I bet some of you have too. Mine started with an engine light, you may also experience a long start too!

Experiencing vibrations? Running rough? Leaking gas? Transmission?

Check for Recalls

What is the EVAP Canister Vent Solenoid?

The EVAP (Evaporative Emission Control System) canister vent solenoid in your Acura MDX manages the release of fuel vapors from the gas tank. When it’s working right, it keeps emissions low and your car running efficiently.

Common Symptoms of a Faulty Solenoid

  • Check Engine Light: The most obvious sign is the check engine light on your dashboard.
  • OBD Trouble Code P1457: This code specifically points to a leak in the EVAP system.
  • Long Start: If your car takes longer to start, it might be the solenoid.
  • Decreased Fuel Mileage: You’ll notice you’re filling up the tank more often.

Interestingly, a simple issue like a worn, missing, or loose gas cap can also cause these symptoms.

Acura MDX Troubleshooting

  1. Check the Gas Cap: Start with the easiest solution. Ensure your gas cap is tight and in good condition. A replacement is inexpensive if it’s worn out.
  2. Scan for Codes: Use an OBD scanner to check for any diagnostic trouble codes. P1457 is a direct indicator of a solenoid issue, but there could be others.
  3. Visual Inspection: Check the EVAP system for any obvious signs of damage or wear, focusing on hoses and connections.
  4. Test the Solenoid: If you’re comfortable with more advanced diagnostics, test the solenoid’s operation with a multimeter.

Other Applicable OBD Codes

  • P0441: Evaporative Emission Control System Incorrect Purge Flow
  • P0442: Evaporative Emission Control System Leak Detected (small leak)
  • P0446: Evaporative Emission Control System Vent Control Circuit Malfunction

Each of these codes indicates a different aspect of the EVAP system issue.  See all the OBD codes here.

Replacing the EVAP Canister Vent Solenoid

  1. Locate the Canister Vent Solenoid:  It’s usually near the charcoal canister, which is often located near the fuel tank.
  2. Inspect Visually:  Before testing, look for any visible damage, loose connections, or cracks.
  3. Disconnect the Solenoid:  Disconnect the electrical connector and vacuum lines from the solenoid. Note their positions.
  4. Conduct an Ohm Test with a Multimeter:
    • Set your multimeter to measure resistance (ohms).
    • Connect the multimeter leads to the terminals of the solenoid.
    • Double check the repair manual, but typically, this is between 20-30 ohms.
  5. Perform a Vacuum Test:  Connect a hand-held vacuum pump to the port of the solenoid.  Apply vacuum to see if the solenoid holds it.
  6. Test Solenoid Operation:
    • Reconnect the electrical connector to the solenoid.
    • Turn the ignition on but don’t start the engine.
    • Use the multimeter set to voltage mode and check if the solenoid is receiving voltage when the engine is turned on.

Final Thoughts

With this guide, I hope you feel more confident in tackling this common problem. Drive safe!