Clean The Maf Sensor on a Lotus Elise
This article will show you how to clean a Mass Air Flow (MAF) sensor on any Toyota 2ZZGE engine. This MAF is on a Lotus Elise, however many Toyota cars came with this same engine and MAF sensor:
- Lotus Elise, Lotus Exige
- Toyota Matrix XRS, Pontiac Vibe GT (USA)
- Toyota Celica GT-S, Toyota Celica SS-II, Toyota Celica 190/T-Sport
- Toyota Corolla XRS, Toyota Corolla Sportivo, Toyota Corolla TS, Toyota Corolla Compressor, Toyota Corolla Fielder Z Aero Tourer, Toyota Corolla Runx Z Aero Tourer, Toyota Corolla RunX RSi
The MAF sensor is used by the engine control module to measure intake air volume for use in calculations to determine fuel and timing.
Over time particles in the air build up on the MAF sensor wire, and need to be cleaned off. Cleaning them is very quick and painless, just be sure to use the proper chemicals.
Note: Just a warning for other car models. If your car has a Karman Vortex style MAF, it cannot be cleaned. Karman Vortex MAF's are constructed quite differently and are generally easy to identify. They are used on Toyota Supra Turbos, Mitsubishi and most Lexus vehicles.
Locate The MAF Sensor
The MAF sensor is located on the on the intake between the air filter and the throttle body. On the Lotus Elise it's on the rear side of air intake box next to the coolant overflow tank.
Disconnect the Wire Harness Connector
Remove MAF Sensor Screws
The MAF Sensor is held on with 2 Phillips head screws. The Elise doesn't have enough space between the coolant overflow and to use a regular screwdriver, so I used this trick little angle ratcheting tool.
Remove MAF Sensor
The MAF sensor should just pull straight out of the intake. You can see the what is inside the intake tubing below.
Clean The MAF Sensor
Locate the sensitive hot-wire anemometers in the MAF. They are actually pretty deep inside the housing. There is another wire that is easily visible, that is the intake air temperature sensor.
This is the much easier to see intake temperature sensor.
Use CRC Brand Mass Air Flow Sensor Cleaner. Don't use any cleaner that isn't designed for MAF sensors.
Spray it into the MAF sensor housing, a few short blasts into the passage where the wires are should clean them.
Do not touch the hot-wire anemometers with anything but cleaner.
You can also spray the temperature sensor and the harness connectors if you believe they need to be cleaned.
Install MAF Sensor
Once you're done spraying the MAF Sensor wires, re-install the MAF Sensor into the intake and reconnect the wire harness.