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12-02-2006, 09:20 AM | #1 | |
AF Newbie
Join Date: Dec 2006
Location: san antonio, Texas
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master air flow sensor
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.
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12-02-2006, 09:38 AM | #2 | ||
AF - Advisor
Join Date: Sep 2005
Location: New London, Missouri
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Re: master air flow sensor
Quote:
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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Remember proper testing gives us the answer to many problems. MT |
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08-22-2008, 09:11 AM | #3 | |
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Join Date: Aug 2008
Location: Wenzhou
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Re: master air flow sensor
Dear Sir,
I know your need from international web that you are in the market for air flow meter. We would like to introduce our company and products, hope that we may build business cooperation in the future. We are factory specializing in the manufacture and export of air flow meter and crankshaft position sensor and other auto parts .We have profuse designs with series quality grade, and expressly, our price is very competitive because we are manufactory, we are the source. You are welcome to visit our website http://www.ryidianqi.com which includes our company profiles, history and something latest designs. Our products are exported to Europe, Mexico and America market more than 8 year mainly on Germany, Italy, France, England, America there are more than 50 countries and areas and well received by the customers. As a very active manufactures, we develop new designs nearly every month, If you have interest in it, it`s my pleasure to offer news to you regular. Best regards, Susan Wang Wenzhou Riyi Vehicle Parts Co., Ltd Add: Northern Industrial Zone, Ruian City, Zhejiang Province, China Zip: 325204 Tel: 86 0577 6537 2555 Fax: 86 0577 6536 7111 Email: salesa@ryidianqi.com Http://www.ryidianqi.com MSN is weiwei_wang2007@msn.com Mobile: 86-13600645969 |
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