Join Date: Mar 2012
Location: Western Michigan
Car: 1998 Subaru Legacy Outback 2.5L Automatic
Feedback Score: 0 reviews
Piston Slap or knocking?
I had noticed this when I first got the car, but then it got warm out and I didn't hear it again. Or if the car sits for a while I notice it as well.
So here it is. When I start the car when it's cold out it is rather loud, sounds like knocking, I assume piston slap. The longer it has sat the longer it goes for.
If the car has sat for a long period of time(a week or more) it starts super rough and then the noise last longer.
So my question is any idea what this might be? Is it due to oil draining out of the cylinders or what?
As for the cold, would an engine block heater help alleviate this problem?
I normally wouldn't worry too much, but it sounds horrendous. Especially when it has sat for a while.
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