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Engine loud knock after standing for a week


Delboy52

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Celica has been stood for a week on the drive, went to start it just now and after a sluggish start there was loud knocking coming from the engine. I shut it down pretty quick. It sounded like the engine had no oil or something was broken. Maybe not all pistons firing?

There is usually a little piston slap when I first start it in the mornings as the oil pressure seems to drop off and it takes a second or two for it to re-pressurise. The car has been facing up on a slight incline so is it possible the oil has drained right back over a week? I checked the dip stick and it is full.

Charging the battery now, but I wanted to know if starting it again could do even more harm? Everything under the bonnet looks dry but it the weather has been very cold and damp while it stood.

Thanks

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