I know this is a b12, but I haven't had a response in the other board yet. I seem to have an engine sound, but I don't know what it is. My timing is not advanced as far as I know. I have a 90 b12 with 130,000 on it. When I am in 3rd 4th or 5th and slam on the gas, I have this crackling sound, but it goes away after about 2000rpn. I can't tell if it is something rattling or not because I am driving the car. It only happens when I accelerate, not when my speed is continuous. A knock or ping would make noise all the time correct? Does anyone have any ideas? Just figuered I'd add....I've been driving the car like this for the past 24,000 miles, so if it was a knock/ping problem the engine should be dead shouldn't it?