I have been having power hesitation problems on my 1994 318is. i have cleaned the mass airflow sensor, the idle control valve, and have replaced the valve cover and spark plugs. The car is running better now, however, there is a breif loss of power when the engine temp is 1/2 way between cold and operating temp and this causes the the 1215 mass air flow sensor fault code. I replaced the O2 sensor last year. When the engine is cold or at operating temp, it seems to be running normally, although I can't test drive it completely as I'm concerned it may lose power.
The Bentley service manual suggests testing the mass airflow sensor resistance across pins 1 and 5 (I also tried 2 and 5). The resistance does not change when I move the vain/door through all its travel with the sensor disconnected. However, the when I test the voltage difference with the sensor connected and the ignition on the voltage changes when I move the door. This means to me that a signal is being generated when airflow is changing, although I could be wrong.
Any comments would be appreciated. Thanks!
Topic: code 1215 MAFS (Read 2600 times)