If it's only on one bank (and at the moment I can't remember how the ECM can detect differences between banks), it could be a faulty injector. or a vacuum leak. An injector could be hanging up spraying too much fuel, or conversely too little fuel or if too much air is getting into the system (from a vacuum leak) it will richen up to compensate. My Volvo ECM book is on the Motronic 1.8 system. Someone with the 4.4 book can be more accurate.
Let us know what you find out Poolman.
DEWFPO
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1998 S90 071,245 and 1995 964 154,100
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