[Edit] 
Answer
You have a pre ignition knock (PING).
Simple solution - use higher octane gasoline.
First answer by ID404894256. Last edit by ID404894256. Question popularity: 4 [recommend question]
Answers.com > Wiki Answers > Categories > Cars and Vehicles > Asian Cars > Mazda > Mazda 626 > I have a 1998 Mazda 626. When I accerlate there is a rattling noise. It comes and goes as I drive?
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Rattling noise on a masda 626 rear? Clicking noise on a 1998 Mazda 626? Knocking when you accerlate Mazda 626? What is a rattling noise on your 2004 Mazda 6? What is a rattling noise under the hood on a mazda 6? 1998 Mazda 626 When you accerlate there is a rattling noise? Rattling noise under hood on mazda 6 when accelerated it goes away?
