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Engine has developed immediate knock Mazda 3

Asked by: 7 views Engine Question

2004 Mazda 3 sport. 2.0L
Hello there, my car has developed an immediate knock after driving over rough road, the oil level is on the bottom mark(just below) and when I run it and remove the spark leads the noise doesn’t change, does this rule out the bottom end? I have tried to locate with hearing but can be sure if it is too or bottom.. please help, tom.


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    First, fill up the oil level to the max signal on the dipstick, or even better replace the engine oil and filter to see if the sound disappears(Could be an empty lifter)

    If it’s a fast low sound, the problem might come from the head.
    Remove the serpentine belt and start it to make sure it’s not the alternator,ac pump,water pump that’s making the noise.

    Crankshaft bearing you do normally hear if you rev it up and when the RPM’s decrease, the sound will appear. You can also get the sound from a bad dual mass flywheel.

    The best way is to use a Stethoscope to locate the noise.

    Ask A Mechanic Admin - Jun 10, 2018 |Reply

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