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9 Posts
Yea i have 99 nissan altima and there is a knocking sound from the engine when i start it up. This only occurs when the car has not been start after about 5 hours. When i start my car it knocks then there isn't any knocking but if i turn it off and restart it again it doesn't knock. I just serviced my car thinking it maybe be some bad plugs but sure it enough it didin't change anything.