Question about 1995 Mazda MPV

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1995 Mazda MPV Noise

Exactly the same as Nick966. It is a loud knocking or tapping noise when idling and it disappears at about 2000 rpm then reappears at idle again. It runs fine otherwise. Did Nick966 ever find a solution?

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  • dbmcclees Jun 25, 2009

    Here is the link to the soundhttp://www.fixya.com/cars/t1390053-mazda... if that helps. It is on the front of the engine.

  • Donnie Matney
    Donnie Matney May 11, 2010

    are you using recommended oil?

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If it's a knocking sound it could be worn internal compnents ie. rod bearings. if it's a ticking sound the valves may need adjustment.
either way a mechanic will have to hear the sound to properly identify it.

Posted on Jun 25, 2009

  • Aaron Murchison
    Aaron Murchison Jun 25, 2009

    sounds like piston slap to me. there really is no cure for that unless you want to rebuild the motor. maybe some other mazda techs can back me up. I've had a couple mpvs come through the shop with that noise and leave with that noise.

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Posted on Jan 02, 2017

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Saw this service bulletin---

TAPPING / KNOCKING NOISE FROM ENGINE AT COLD START
This bulletin amends ITB02-049. This version amends the Applied Vehicles.
Please discard all paper copies of the earlier version.
APPLIED VEHICLE: 2002 - 2004 Q45 (F50)
2003 - 2004 M45 (Y34)
2003 - 2004 FX45 (S50) with V8 engine.
IF YOU CONFIRM:
A tapping or knocking noise (similar to a piston or valvetrain noise) when starting a cold engine,
NOTE: The engine is considered “cold” when it has been OFF (not running) for several hours.
ACTIONS:
1. Dislodge and remove any carbon deposits that may have caused the noise and confirm that carbon
deposits were the cause of the noise.
• While the noise is occurring, quickly rev the engine several times to approximately 4,000 RPM. Then
release the accelerator quickly, as soon as the engine reaches 4,000 RPM.
• The noise should disappear immediately if carbon deposits are the cause.
NOTE:
• If the customer reported a noise that exactly matches the symptoms listed above, but you cannot
duplicate it, the cause may still be carbon deposits. Go to step 2.
• If the noise does not stop after revving the engine, or you observe any other noise that doesn’t match
one described above, go back to ASIST for further diagnostic and repair information.
2. To prevent this incident from occurring again, add a bottle of Nissan In-Tank Fuel System Cleaner
P/N 999MP-FSC00P to a full tank of fuel (in the vehicle’s fuel tank) according to the instructions on the
label.
• This product is proven to reduce carbon deposits on pistons and combustion chambers, as well as
cleaning other components of the fuel system.

Hope helps.

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