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[geoffr70]

Hello, after trying to start the car it just splutters and turns over. When it was running it seemed like it's not firing on all cylinders. On further inspection there is oil in one of the cylinders, and the spark plug has been flattened. What could be the cause of this? Failed DIS, failed crank position sensor? Thanks for any help!

[Entwood]

Hello, after trying to start the car it just splutters and turns over. When it was running it seemed like it's not firing on all cylinders. On further inspection there is oil in one of the cylinders, and the spark plug has been flattened. What could be the cause of this? Failed DIS, failed crank position sensor? Thanks for any help!

The ONLY thing that can cause this is "hydraulicing" ... where oil enters the cylinder and an attempt it made to compress it ... which will fail as oil is incompressable.

You either have a severe leak past the piston rings, - unlikely as if it got in that way it could get out the same way - or possibly the valve stems

Either way I would not even turn the engine over (with a plug in) until the source of the oil has ben found and recitified. Further attempts at compressing oil will damage the bottom end.

[Kevin Wood]

If the plug has been flattened, I'd say there's a foreign object in the cylinder. Oil alone won't do that.

Kevin