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GMC Yukon 2000–2006

GMC YukonModel years 2000–2006

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1 conditions added

Common on this vehicle:LeakMisfire or rough idleNoise

causeCylinderRemove

Record by record

4 records state a cause or a remedy. Each record is shown as short labels in the order fault → finding the cause → correction. Press a label to narrow to the records that state it.

Symptom

Component named as the cause

A ribbon is as wide as the records that state both of its ends (only the commonest are drawn). A record that names several symptoms or components runs through each. Orange is records that say the fault came back or was not fixed. Results come from owners’ reports only; one that does not say is “result not stated”. None of this is a likelihood of a cause or a rate at which work succeeds.

Read the records one by one (2)

ENGINE1

  1. Manufacturer communication2000–2006 GMC YUKON DENALI ・ 2018-09-17(2 earlier editions of this document folded here)

    Engine Block Cylinder Bore Damage Preliminary Information

    1. 1Fault

      • The tip is for cases where cylinder bore damage, scoring or out of round is suspected as the cause of engine oil consumption, misfire, cylinder leakage or blow by.

    2. 2Finding the cause

      Possible causes

      • Dirt intrusion: if the air filtering system has been compromised the engine wears out very quickly; grit is found in the intake runners and the bores look lightly sand blasted.
      • Catalytic converter failure: if the converter brick is broken, its dust can be drawn back into the engine, and the bores look sand blasted.

      Steps to confirm (in the document’s order)

      1. The peak to valley specification for the crosshatch is .65-2.8 microns.
      2. Cylinder damage or scoring: the cylinder walls have grooves deep enough to catch with a fingernail.
      3. An out of round bore has areas where the crosshatch is missing or worn in different sections of the bore.
      4. If crosshatch is present all the way around the bore from top to bottom, the bore is not out of round.

    3. 3Correction

      Repair

      • With converter dust, the back cylinders go first if caught early; otherwise there is no crosshatch left and the engine needs to be replaced.

      Caution

      • GM has not had an issue with cylinders being machined out of round for any engine family in recent history.
      • A cylinder suspected of being oversize can only be confirmed by checking with an air gauge at the engine plant.
    Read the sentences of the record

    From the manufacturer’s document

    • Applies to：Applies to all brands, models and engines, 2000 - 2019.
    • Condition：The tip is for cases where cylinder bore damage, scoring or out of round is suspected as the cause of engine oil consumption, misfire, cylinder leakage or blow by.
    • Caution：GM has not had an issue with cylinders being machined out of round for any engine family in recent history.
    • Confirm：The peak to valley specification for the crosshatch is .65-2.8 microns.
    • Confirm：Cylinder damage or scoring: the cylinder walls have grooves deep enough to catch with a fingernail.
    • Confirm：An out of round bore has areas where the crosshatch is missing or worn in different sections of the bore.
    • Confirm：If crosshatch is present all the way around the bore from top to bottom, the bore is not out of round.
    • Cause：Dirt intrusion: if the air filtering system has been compromised the engine wears out very quickly; grit is found in the intake runners and the bores look lightly sand blasted.
    • Cause：Catalytic converter failure: if the converter brick is broken, its dust can be drawn back into the engine, and the bores look sand blasted.
    • Repair：With converter dust, the back cylinders go first if caught early; otherwise there is no crosshatch left and the engine needs to be replaced.
    • Caution：A cylinder suspected of being oversize can only be confirmed by checking with an air gauge at the engine plant.

    Open the manufacturer’s document (PDF) ↗ The points above were read from this document.

    Remedy
    This Preliminary Information communication provides information to the technician about engine block of possible cylinder bore damage, scoring or out of round as the possible cause of engine oil consumption, misfire, cylinder leakage or blow by. Technician will need to inspect the engine for Cylinder damage or scoring, An out of round cylinder bore, Dirt intrusion, and Catalytic Converter failure.

ENGINE AND ENGINE COOLING1

  1. Owner complaint2003 GMC YUKON ・ 2004-02-19

    Piston slap noise on cold start in 5.3L engine

    1. 1Fault

    2. 2Finding the cause

    3. 3Correction

      Not stated

    Read the sentences of the record
    Fault
    THE NOISE IS VERY LOUD WHEN THE ENGINE IS COLD BUT AFTER A PERIOD OF 10-15 MINUTES THE NOISE GOES AWAY.
    Cause
    THE CONSUMER INDICATED THAT GMC MANUFACTURED A LARGE NUMBER OF 5.3 LITER ENGINES WITH EITHER UNDER SIZED PISTONS OR OVER SIZED COMBUSTION CYLINDERS WHICH RESULTED IN PISTON SLAP.

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