If the A/C is Off, the Engine runs cool. If the A/C is switched ON, I get some sort of knocking on the engine. If I press the gas pedal a little (just a little does), it runs smooth. I suspect idling to be adjusted (!?!) I need suggestions please.
My VW Polo gives knock (!?!) if I switch on the A/C when its idling.?
yea..adjust the idling a little bit.. my friends van had a similar problem. sometimes the engine would just stop running and needs to be started again when the ac is on.
Reply:I think it may be piston slap. It is caused by the piston rotating ever so slightly,side to side, on the connecting rod wrist pin when the AC adds a little extra effort for the engine to overcome. I am curious to see other answers like you are.
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