Mechanics

840CI EXPERIENCING PROBLEMS WITH MY CHECK ENGINE LIGHT.

1998 BMW 840 • V8 2WD Automatic • 89,000 miles

1998 BMW 840Ci mileage: 89,000. I have been experiencing problems with my check engine light. I have had the engine codes looked at and it was diagnosed as the 02 sensor. So, I have replaced it. Since then, I have also replaced all of my spark plug wires and my breather tube. I am currently at a loss. The light comes on about every other day and when it does come on the engine loses acceleration power and shutters lightly. It is drivable but the problem is very noticeable. It seems to me when it all goes wrong the fuel mixture is off so the engine over compensates and is either letting too much air in or it is letting too much fuel in. Any Suggestions? What do you think is the next best step?
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2CarPros-Archives
October 12, 2010.




Rescan the computer for fault codes. If no trouble codes appear and it still has the same symptoms the computer or ECM could be malfunctioning sending the wrong mixture to the injectors.

Tiny
2CarPros-Archives
Oct 12, 2010.
Have you been able to distinguish any faults with the car yet or are you still searching?
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Dr. Hagerty
Dec 18, 2010.

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