Compare MAF and MAP sensors—what they measure, how they influence fuel metering, and the effects of dirty sensors.

Compare MAF and MAP sensors—what they measure, how they influence fuel metering, and the effects of dirty sensors.

• A. MAF measures actual mass air flow; MAP estimates load by manifold pressure and engine speed. Both feed the ECU for fuel metering; dirty sensors cause incorrect fuel trims, rough idle, misfires, and reduced efficiency.
• B. MAF measures air density, MAP measures air temperature; dirty sensors only affect idle.
• C. Both sensors measure the same parameter; dirt has no effect.
• D. MAF uses MAP to compute mass; MAP uses MAF to compute load; dirty sensors don't affect performance.

Answer: (A)