Question about 1998 BMW 7 Series

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I have a 1998 BMW 740iL with high miles, 287,000. The car vibrates when cranked and while standing at traffic light . Aslo very bad acceleration and a fuel smell. Codes pulled are p0100- p0300 all the way through p0308 with the exception of cylinder #6. Also have p0500 which if I am correct is maff sensor. Car runs great once above 50mph. Try to get another year or so out of the car. Where should I start to diagnose my fix?

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P0100 OBD-II Trouble Code

Technical Description

Mass Air Flow (MAF) Circuit Malfunction

Basically this means that there's a problem with the Mass Air Flow (MAF) sensor or circuit.

You will likely not notice any serious driving problems, but there may be symptoms like a general decrease in power or sluggishness.
Causes

A code P0100 may mean one or more of the following:

* The MAF may be disconnected, or a wiring connection may be bad.
* The MAF sensor may be faulty.

Possible Solutions

Use an OBD II Reader (or go tou your local parts store and they will for free) and reset the code and see if it comes back.
Then start with the cheapest, easiest repair procedures:

* Check the Mass Air Flow Sensor wiring/harness is connected properly and that there are no broken / frayed wires.
* Unplug and reconnect the MAF wiring harness a few times to clear the contacts.
* Check the voltage of the MAF sensor (refer to a repair manual for vehicle specific information).
* Replace the MAF sensor.

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Posted on Sep 28, 2010

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