Question Answered: Sudden loss of power
December 22, 2010, 03:57 PM
Have you analyzed the o2 and mass air flow sensors? My 93' 600sel has the same problem and when analyzed by the dealer I was told it was more than likely the mass air flow sensor, or O2 sensors, or throttle motors. I replaced the O2 sensors first with little success. Then I replaced the mass air flow sensor on the passenger side which helped a great deal but not entirely. When the budget allows I'm replacing the drivers side mass air flow sensor. I hope that does it, because the dealer price on the throttle motors is about $7,000. If they need replacing.....the car will become a parts vehicle. When the car balks like you describe, turn off the cruise-put it in neutral, and restart it. It should run correctly for a while to get you out of trouble on the road. Happened to me during rush hour on the I-system in downtown St. Louis......scary!
Problem Reported: Faulty Mass Air Flow Sensor Causing Erratic Engine Operation and Poor Fuel Economy
September 15, 2010, 10:07 PM
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<html><body><p>A faulty <a id="ce_5631" class="ct_glossary tooltip" href="/mass-airflow-sensor">mass air flow (MAF) sensor</a> can cause erratic/rough engine operation and fuel economy issues. Since this sensor measures the actual amount of air entering the motor, when it fails, the <a id="ce_5613" class="ct_glossary tooltip" href="/engine-control-unit">engine control module (ECM)</a> takes the wrong information and delivers incorrect volumes of fuel to the cylinders.</p>