master air flow sensor


brvenable sr
12-02-2006, 10:20 AM
my aerostar van show master air flow sensor having problem from time to time. Can the sensor be cleaned. If need to be replace where can I get the best price. I understand the auto parts store charge a high core amount. Just had a tune up done on it.

MT-2500
12-02-2006, 10:38 AM
my aerostar van show master air flow sensor having problem from time to time. Can the sensor be cleaned. If need to be replace where can I get the best price. I understand the auto parts store charge a high core amount. Just had a tune up done on it.

Welcome on your first post on AF.
What code no does it show?
Some times a spray clean with carb cleaner or MAF sensor cleaner will help.
To make sure it is working right you need some scanner readings and match your Baro readings to you height above sea level.

AROMETRIC PRESSURE REFERENCE CHART
Barometric Barometric BARO/MAP Altitude Above
Pressure Pressure PID Sea Level
(in. Hg.) (kPa) (Hz) (ft)
3.5 11.8 89.3
5 16.9 92.8
10 33.8 104.6
15 50.7 117.0 14,000
20 67.5 129.6 10,000
21 70.9 132.5 9,000
22 74.3 135.4 8,000
23 77.7 I 138.3 7,000
24 81.1 141.1 6,000
25 84.4 144.0 5,000
26 87.8 146.9 4,000
27 91.2 149.8 3,000
28 94.6 152.8 2,000
29 97.9 155.8 1,000
30 101.3 158.9 0 (sea level


On a fully warmed up engine, look at Long Term Fuel Trim at idle, in Neutral, A/C off, (LONGFT1 and/or LONGFT2 PIDs). If it is more negative than -12%, the fuel system has learned lean corrections which may be due to the MAF sensor over-estimating air flow at idle. Note that both Banks 1 and 2 will exhibit negative corrections for 2-bank system. If only one bank of a 2-bank system has negative corrections, the MAP sensor is probably not contaminated..

3. On a fully warmed up engine, look at MAF voltage at idle, in
Neutral, A/C off (MAF V PID). If it's 30% greater than the nominal MAF V voltage listed in the Powertrain Control/Emissions Diagnosis (PC/ED) Diagnostic Value Reference Charts for your vehicle, or greater than 1.1 volts as a rough guide, the MAF sensor is
over-estimating air flow at idle.

4

If at least two of the previous three steps are true, proceed to disconnect the MAF sensor connector. This puts the vehicle in)to Failure Mode and Effects Management (FMEM). In FMEM mode, air flow is inferred by using rpm and throttle position instead of reading the MAF sensor. (in addition, the BARO value is reset to a base/unlearned value.) If the lean driveability symptoms go away, the MAF sensor is probably bad. Clean or replace.
MT

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08-22-2008, 09:11 AM
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