Question about 2003 Mazda MPV

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Upper engine knocking

When at an idle, I hear a knocking noise coming from the top of the engine, when standing in front of the car. Could this be a loose valve or are they auto adjust? This is a 2003 MPV with 68,000 miles.

Thanks for your help

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  • Shredchuck Nov 18, 2008

    Thanks for your feedback on this. This is more of a click, rather than a knock, so I will try the valve additive or kerosene.



  • Steve Allison
    Steve Allison May 11, 2010

    Define 'knocking' a bit better; there isn't much in the upper engine that can produce a hard sound; valves, if they have too much clearance will 'click' rather than 'knock.'

    To learn if you have hydraulic or mechanical valves, check your owner's manual. If you find a maintenance interval that specifies 'valve clearance check' or adjustment, they are mechanical.    

    If you find they are hydraulic, try some (often doesn't work the first time) valve additive. This may require an oil change after a specified mileage.

    Since I'm old, we would just dump a quart of kerosene into the crankcase, let the engine run at an idle or just drive it gently a few miles and then an oil change. 



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I suggest if you know how to work on cars, adjusting your lifters, this is the common problem with those motors.

Posted on Nov 26, 2008


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