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Knocking noises in the engine - Cimarron Cadillac Cars & Trucks

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  • Anonymous Mar 17, 2009

    my 99 gmc jimmy knocks when i start it and will stay for awhile sometimes or go away instantly, i changed the oil and i did not hear it for about 2 weeks but its back and i have no idea what it could be.

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Because at cold startup all the oil has drained out of the engine and it takes a few seconds for it to get pumped aka primed back up. the reason it doesnt't do it when it is new oil. Is because it is newer and thicker

Posted on Apr 23, 2009

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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
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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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