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Engine Mechanical – V6 Page 6A1–29
2.3 Engine Misfire without Internal Engine Cause Correction Abnormalities, severe cracking, bumps or missing areas in Abnormalities in the accessory drive system and/or Replace the accessory drive belt, refer to 3.5 Accessory Refer to 6C1-2 Engine Management – V6 – Diagnostics to Worn, damaged or misaligned accessory drive components A misfire code may be present without an actual misfire Inspect the components and repair or replace as required. Refer to 6C1-2 Engine Management – V6 – Diagnostics to Loose or incorrectly fitted flexplate or crankshaft balancer A misfire DTC may be present without an actual misfire Repair or replace the flexplate or crankshaft balancer as Crankshaft Balancer Assembly or 4.3 Flexplate Assembly. Refer to 6C1-2 Engine Management – V6 – Diagnostics to Restricted exhaust system. A severe restriction in the exhaust flow can cause Repair or replace exhaust system components as required, Refer to 6C1-2 Engine Management – V6 – Diagnostics to Incorrectly installed or damaged vacuum hoses. Repair or replace vacuum hoses as required. Incorrect sealing between the intake manifold and cylinder Repair or replace the intake manifold, throttle body gaskets, Incorrectly installed or damaged barometric Repair or replace the BARO sensor and/or seal as Incorrectly installed or damaged EVAP purge solenoid Repair or replace the EVAP purge solenoid and/or seal as Worn or loose stationary hydraulic lash adjusters (SHLA) The SHLAs, rocker arms and roller bearings should be Replace the SHLAs and/or rocker arms as required, refer to Stationary Hydraulic Lash Adjuster or 3.20 Rocker Arm. Stuck valves. Carbon build up on the valve stems can result in the valves Repair or replace as required, refer to 3.22 Cylinder Head Excessively worn or misaligned timing chain/s. Replace the timing chain/s and components as required, Timing Chains, Tensioners, Shoes and Guides. Worn camshaft lobes. Replace the camshaft/s and SHLAs as required, refer to Camshaft or 3.21 Stationary Hydraulic Lash Adjuster. Excessive oil pressure. A lubrication system with excessive oil pressure may lead 1 Perform an oil pressure test, refer to 3.1 Oil. 2 Repair or replace the engine oil pump as required, |