Question about 2004 GMC Sierra 2500

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MY 6L V8 makes a loud knocking noise only when it first starts for only about 30 seconds then you never hear any more knocking for the rest of the day Is this a valve problem?

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Hi, this could be caused by the hydraulic lifters. As soon as they get sufficient oil pressure, they quiet down.

Posted on Nov 17, 2009

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In some oil filters they have anti drain back valves in them, what keeps oil in the filter when sitting for a long time. this helps get oil to ur top end quicker. If not i takes longer to get oil to ur rocker arms so you might hear a knocking or ticking for a while. Try when u do ur next oil change to get a filter it a anti drain back valve and that should help make that noise go away quicker.

Posted on Nov 17, 2009

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Makes loud noise


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Smoke on start? Could be a valve problem where all your oil is in the bottom at start? Belts are squeaking too? Maybe a tensioner went bad?

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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1 Answer

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The coolant pressure cap hose that connnects to the radiator:
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