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6A-12 ENGINE MECHANICAL (4JK1/4JJ1) Turbocharger Troubleshooting Condition Possible Cause Correction Air leakage from intake pipe rubber Repair Air leakage from intake cover Repair Clogged intercooler cooling section Clean Clogged air cleaner element Clean or replace Intake throttle valve stuck Repair or replace Turbine and housing contact Replace Excessive carbon deposit near Clean or repair Rough turbine shaft rotation Repair or replace Engine has less than normal power Damaged turbine blade Repair or replace Oil leakage from turbocharger oil Repair or replace Clogged turbocharger oil return Repair Clogged center housing oil Repair or replace Blue exhaust smoke Engine oil deterioration Change engine oil Gas leakage from intake or Repair Turbine and housing contact Repair or replace Damaged turbine blade Replace Noisy turbocharger operation Turbine shaft bearing abrasion or Repair or replace Engine oil deterioration Change engine oil Clogged turbocharger oil feed pipe Repair Excessive rotating part wear Low engine oil pressure Repair
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