Don't butt a stock MAF meter directly up against the back of the air filter, either. The MAF should not butt up against the throttle body the delay between actual airflow through the meter versus the amount of throttle opening in the throttle body may confuse the signal to the ECU. If departing from the factory ducting and mounting location, a Ford OE MAF meter ideally needs about 10 inches of straight tubing on either side of it for optimal performance. Bends immediately downstream or upstream from the MAF disturb airflow through the meter, resulting in an incorrect reading. The meter might not work properly if relocated. Mass Air meter improperly installed or located (doesn't apply to 1987 Grand Marquis and other Speed Density vehicles): Factory MAF meter calibration assumes an original OE mounting location.
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