Question about 1995 Mazda MPV

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Mazda MPV V6 engine noise

We have a '95 V6 MPV and the engine has started to make a loud tapping/knocking noise, usually when cold. The noise dies down after the engine has got up to temperature and also stops at higher revs... can anyone tell me if the noise is the lifters (see videos below)? Many thanks!






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  • nick966 Dec 18, 2008

    Thanks for your input, Ghostsnake :-)
    The noise seems to be coming from down the front end rather than up around the exhaust manifold and is very 'mechanical' as opposed to an un-muffled exhaust note. The noise also reduces when picking up the revs even when cold. I'll check it out a bit closer tomorrow though to see if I can determine exactly where it's coming from.
    Thanks again!

  • Anonymous Jan 16, 2009

    Let me direct you to this link. The problem is a flaw and, if fixed, it comes back. Change the oil more than recommended.
    http://www.epinions.com/review/auto_Make...


  • Anonymous Mar 21, 2014

    The tensioner bolt sheared off but was running fine, just made a lot of noise up front that would come and go. It this motor an interference motor?

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The same thing happened to mine and i hade to replace the harmonic balancer and key

Posted on Feb 07, 2012

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Tie rod ends?
http://www.mpvclub.com/tsb.php?id=116

Posted on Mar 19, 2010

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Im thinking its the timeing belt and timeing belt tensioner. the sam problem happedned to me and my engine.

Posted on Mar 16, 2010

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My strong guess without looking at it would be a cracked exhaust manifold, when it gets hot the metal expands an it doesn't leak.

Posted on Dec 18, 2008

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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
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• While the noise is occurring, quickly rev the engine several times to approximately 4,000 RPM. Then
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NOTE:
• If the customer reported a noise that exactly matches the symptoms listed above, but you cannot
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• If the noise does not stop after revving the engine, or you observe any other noise that doesn’t match
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2. To prevent this incident from occurring again, add a bottle of Nissan In-Tank Fuel System Cleaner
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label.
• This product is proven to reduce carbon deposits on pistons and combustion chambers, as well as
cleaning other components of the fuel system.

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