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#1
01-16-2016, 05:38 PM
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malfunction fuel trim bank 1 ???? help please
i had my mate do a diagnostic on my 2001 4.4 e53 after the trio of lights came on which turns out to be the rear abs sensor.
also "malfunction fuel trim bank 1" came up. what is this please. what should i check and how do i fix it etc. thanks. p.s. i only fitted the rear speed / abs sensor 6 mths ago. i should have got an oem one buy cheap, buy twice. 
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#2
01-16-2016, 05:55 PM
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If the trouble codes have not been cleared the fuel trim code could be an old code and no longer an issue. Do you have any symptoms there is a problem?
__________________
 X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interiorDallas
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#4
01-17-2016, 11:55 AM
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Quote:
If there are clear symptoms, I would check for an obvious vacuum leak. Finding none, I would check connection on the pre cat O2 sensor on that bank. If it seems to be OK I would clean the MAF with MAF cleaner, usually helps enough that the problem is pinpointed. If the problem is not resolved I would swap O2 sensors side to side and see if he code moves to the other bank and go from there. Whenever there is a miss or feels like there is a loss of power I gravitate to the MAF and clean it as the odds are good that is the problem, easy to do and can't hurt if you use MAF cleaner.
__________________
X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interiorDallas
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#6
01-18-2016, 10:11 AM
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Quote:
There's plenty of videos on youtube about MAF and how to clean them. If you decide to replace the MAF, don't buy a wing wang or wing wong MAF from eBay or Amazon. Buy a genuine Siemens MAF.
__________________
2006 Infiniti G35 2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD Lotus Europa 1970 Destroyed by fire Lotus Europa 1970 S2 Renault Powered Lotus Type 52 1970 Twincam Webers Powered PORSCHE 911 Targa 1982 The Garage Queen Audi Avant donated to Kars for Kids BMW 525IT Sold Audi 4000CS Quattro Sold Jensen Healey Lotus Powered Sold Opel 1900 Sold Triumph Spitfire 1971 Sold Triumph Spitfire 1968 Sold Plymouth "Cuda" 340 Six pack SOLD
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#7
01-17-2016, 10:55 AM
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__________________
2006 Infiniti G35 2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD Lotus Europa 1970 Destroyed by fire Lotus Europa 1970 S2 Renault Powered Lotus Type 52 1970 Twincam Webers Powered PORSCHE 911 Targa 1982 The Garage Queen Audi Avant donated to Kars for Kids BMW 525IT Sold Audi 4000CS Quattro Sold Jensen Healey Lotus Powered Sold Opel 1900 Sold Triumph Spitfire 1971 Sold Triumph Spitfire 1968 Sold Plymouth "Cuda" 340 Six pack SOLD
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#8
01-18-2016, 12:53 PM
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I have attached a youtube video that explains what a MAF does and how to clean it. The MAF in your 4.4 looks quite different but the only wires coming out of the air intake tube are for the MAF.
https://www.youtube.com/watch?v=gRfaPfTcfOM
__________________
X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interiorDallas
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