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When I start my engine, it kinda of makes a deep "lul-lul-lul-lul-lul" sound coming from deep in the engine on the right side. It doesn't seem to be coming from the heads when I stick me head close and listen. It sounds like it's coming from somewhere inside the block on the right side. Anyone know what this might be?
I had an o2 sensor replaced a couple of months ago. Any chance the left bank might be running a slightly different mixture than the right bank of cylinders? I never noticed this sound until after the o2 sensor replacement, but then again, that doesnt mean it wasn't making the sound before. I never paid attention until recently. It could have always been making this sound.