What does the Mass Air Flow Sensor do??? What would be a good price for a Sensor. After installing a new sensor would it be necesary for the MB dealer to make any adjustments to the Sensor???? Any help would be appreciated... Jim

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James A. Harris

The sensor tells the ECU how much air the engine is ingesting so that it may meter the proper amount of fuel. Very critical to engine performance as the engine only operates well over a small range of air to fuel ratios. It is a several hundred dollar part and proper install includes checking and replacing questionable air filters, air box sealing rings, as well as resetting the ECU's adaptations to the previous failed sensor.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff

Take a look at this post:

How to Clean Mass Air Flow Sensor

Carberated cars use the Venturi effect. The air flow would suck in fuel as it went through the carberator. With electronic fuel injection you no longer have this automatic way of mixing fuel and so you need some way for the computer to figure out how much fuel to inject. For the best fuel economy the method is to measure how much air is flowing in and adjust the fuel accordingly. The Mass Air Flow sensor measures the air flow.

The replacement process is dirt simple, less than 15 minutes if you don't know what you are doing. There are no adjustments afterwards. The sensor is pretty cheap, about US$150 IIRC.