Edmunds Answers

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  • avatar MrShift@Edmunds 05/11/08 12:16 pm PST

    Could be TWO things---the one mentioned above, but also this one:


    File In Section: 06 - Engine/Propulsion System

    Bulletin No.: 02-06-01-038

    Date: December, 2002

    TECHNICAL
    Subject:
    Engine Knock or Lifter Noise (Replace 0-Ring)

    Models:
    2001-2002 Chevrolet Camaro
    2001-2003 Chevrolet Corvette
    2001-2002 Pontiac Firebird
    2002-2003 Cadillac Escalade, Escalade EXT
    2000-2003 Chevrolet Suburban, Tahoe
    2001-2003 Chevrolet Silverado
    2002-2003 Chevrolet Avalanche
    2000-2003 GMC Yukon, Yukon XL
    2001-2003 GMC Sierra
    with 4.8L, 5.3L, 5.7L or 6.0L V8 Engine (VINs V, T, Z, G, S, N, U - RPOs LR4, LM7, L59, LS1, LS6, LQ9, LQ4)

    Condition

    Some customers may comment on an engine tick noise. The distinguishing characteristic of this condition is that it likely will have been present since new, and is typically noticed within the first 161-322 km (100-200 mi). The noise may often be diagnosed as a collapsed lifter. Additionally, the noise may be present at cold start and appear to diminish and then return as the engine warms to operating temperature. This noise is different from other noises that may begin to occur at 3219-4828 km (2000-3000 mi).

    Cause

    The 0-ring seal between the oil pump screen and the oil pump may be cut, causing aeration of the oil.

    Correction

    Inspect the 0-ring seal and replace as necessary. Use the applicable part number listed below. Refer to the Engine Mechanical sub-section of the appropriate Service Manual.


    HERE'S THE BULLETIN ON THE CSK

    File In Section: 06 - Engine/Propulsion System

    Bulletin No.: 01-06-01-028A

    Date: March, 2003

    INFORMATION
    Subject:
    Engine Knock on Cold Start

    Models:
    1999-2002 Chevrolet and GMC C/K Pickup and Utility Models
    2002 Cadillac Escalade (2WD)
    with 4.8L, 5.3L or 6.0L Engine (VINS V, T, Z, U - RPOs LR4, LM7, L59, LQ4)

    This bulletin is being revised to add an additional engine to the models section. Please discard Corporate Bulletin Number 01-06-01-028 (Section 06-Engine).

    Some of the above vehicles may exhibit an engine knock noise that begins in the first 19,000-24,000 km (12,000-15,000 mi) of use. The knock noise is most often noticed during initial start-up and typically disappears within the first 5-30 seconds (may last longer in extreme cold temperatures). The noise is usually more noticeable on the initial start-up when the temperature is below 10°C (50°F) and may be more pronounced on the first cold start following a long trip.

    This noise may be caused by an interaction between carbon that has formed on the piston, the piston motion and the cylinder wall. GM Powertrain Engineering, and an analysis of engines with this condition, has confirmed that the noise is not detrimental to the performance, reliability or durability of the engine.

    THIS NOISE DOES NOT HAVE ANY EFFECT ON THE LONGEVITY OF ANY OF THE ENGINE COMPONENTS.
    Important: At this time, attempts to repair this condition by replacing the engine assembly or pistons are not recommended.

Answers

  • obyone 05/11/08 11:17 am PST

    It's called the CSK or cold start knock. GM says it will not harm the engine in the long haul. Just a bit annoying and according to GM nothing to worry about. It's also known to get louder. Seeing that you have a '02 model I wouldn't worry about it getting louder or having any issues.

  • MrShift@Edmunds 05/11/08 12:16 pm PST

    Could be TWO things---the one mentioned above, but also this one:


    File In Section: 06 - Engine/Propulsion System

    Bulletin No.: 02-06-01-038

    Date: December, 2002

    TECHNICAL
    Subject:
    Engine Knock or Lifter Noise (Replace 0-Ring)

    Models:
    2001-2002 Chevrolet Camaro
    2001-2003 Chevrolet Corvette
    2001-2002 Pontiac Firebird
    2002-2003 Cadillac Escalade, Escalade EXT
    2000-2003 Chevrolet Suburban, Tahoe
    2001-2003 Chevrolet Silverado
    2002-2003 Chevrolet Avalanche
    2000-2003 GMC Yukon, Yukon XL
    2001-2003 GMC Sierra
    with 4.8L, 5.3L, 5.7L or 6.0L V8 Engine (VINs V, T, Z, G, S, N, U - RPOs LR4, LM7, L59, LS1, LS6, LQ9, LQ4)

    Condition

    Some customers may comment on an engine tick noise. The distinguishing characteristic of this condition is that it likely will have been present since new, and is typically noticed within the first 161-322 km (100-200 mi). The noise may often be diagnosed as a collapsed lifter. Additionally, the noise may be present at cold start and appear to diminish and then return as the engine warms to operating temperature. This noise is different from other noises that may begin to occur at 3219-4828 km (2000-3000 mi).

    Cause

    The 0-ring seal between the oil pump screen and the oil pump may be cut, causing aeration of the oil.

    Correction

    Inspect the 0-ring seal and replace as necessary. Use the applicable part number listed below. Refer to the Engine Mechanical sub-section of the appropriate Service Manual.


    HERE'S THE BULLETIN ON THE CSK

    File In Section: 06 - Engine/Propulsion System

    Bulletin No.: 01-06-01-028A

    Date: March, 2003

    INFORMATION
    Subject:
    Engine Knock on Cold Start

    Models:
    1999-2002 Chevrolet and GMC C/K Pickup and Utility Models
    2002 Cadillac Escalade (2WD)
    with 4.8L, 5.3L or 6.0L Engine (VINS V, T, Z, U - RPOs LR4, LM7, L59, LQ4)

    This bulletin is being revised to add an additional engine to the models section. Please discard Corporate Bulletin Number 01-06-01-028 (Section 06-Engine).

    Some of the above vehicles may exhibit an engine knock noise that begins in the first 19,000-24,000 km (12,000-15,000 mi) of use. The knock noise is most often noticed during initial start-up and typically disappears within the first 5-30 seconds (may last longer in extreme cold temperatures). The noise is usually more noticeable on the initial start-up when the temperature is below 10°C (50°F) and may be more pronounced on the first cold start following a long trip.

    This noise may be caused by an interaction between carbon that has formed on the piston, the piston motion and the cylinder wall. GM Powertrain Engineering, and an analysis of engines with this condition, has confirmed that the noise is not detrimental to the performance, reliability or durability of the engine.

    THIS NOISE DOES NOT HAVE ANY EFFECT ON THE LONGEVITY OF ANY OF THE ENGINE COMPONENTS.
    Important: At this time, attempts to repair this condition by replacing the engine assembly or pistons are not recommended.

  • tigge 05/11/08 4:19 pm PST

    Thanks a lot! both of you for your answers, your right about this cold-start. I normally associated this with cold mornings etc, but ofcourse first-time start in any morning, the engine is cold.

  • dmanport 11/17/10 10:27 pm PST

    The more important TSB if buying used is #01-06-01-028. It covers 1999-2002 4.8, 5.3 and 6.0 engines on engine knock at startup

  • bkennedy866 10/15/11 6:34 am PST

    This is common on the 5.3 v-8. The short skirt on the piston etc
    builds up carbon on the piston heads over time.

    I got rid of the ticking knocking on colder weather start up by changing oil type from 10/30 to 5/30. I use Castrol Edge sythetic

    Another thing I did was run Reslone on the oil change to clean the lifters.

    Pulled the spark plugs and inserted Sea Foam in the spark plug holes and let it soak all night. Cranked it to push the foam out, then put plugs back in. A lot of smoke will come out. This cleaned the carbon off the heads and reduced the noise a lot.

    You need to change your oil after this, as it may become contaminated. BJK

  • colima1970 12/07/13 6:27 am PST

    Replace pcv valve with one from a 2004 5.3 engine. That will fix the problem.

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