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When starting the car after it has sat for a few hours or overnight it takes a long time for it to turn over(fire up). If the engine is warm and I shut it off, it will start right up.
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I'm the one that posted the question. After some leg work, I found out my Z4s problem can be solved with a high quality injection cleaner. Maybe 2. I hope this might help some one else that might be thinking it's a bad coil , not burning all the fuel.