Geely MR479Q Manual
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Contents
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IV. Exhaust Smoke from Exhaust PipeIs Abnormal (or with Unusual Odor)When combustion system of an engine fails, smoke discharged from exhaust pipe is abnormal in color.1. Exhaust Smoke Is Very DarkThis is caused by incomplete combustion, gas mixture is too thick to be combusted completely, and certain gasoline isdischarged even without combustion, which leads to decrease of engine power. Now it is necessary to adjust concentrationof gas mixture in time, check fuel pressure adjuster, throttle position sensor, injector and ECU system and make correc-tions.2. Exhaust Smoke Is Blue with Unusual OdorThis is indicative of the substantial existence of engine oil vapor in the exhaust gas. Engine oil enters cylinder and partici-pates in combustion. The main cause is that oil piston ring is not scraped neatly, and abraded improperly, now replace theoil ring; it is also possible that valve oil seal is defective or the spacing between valve stem and bushing is too large, so thatoil enters combustion chamber to participate in combustion. In this case, it is necessary to replace oil seal or bushing toreturn to normal condition.Item Symptom Cause Elimination methodInsufficient coolantDefectiveradiatorDefective radiator hoseDefective radiator hose bandDefective head gasketCrack on cylinder bodyDefective seal of water pumpAntifreeze not replacedDefective thermostatReplace antifreezeReplace the thermostatClogged cooling pipePoor ventilationVoltage irregularityTemperature control switchof radiator failsWater jacket clogged due toexcessive scale depositsOil in engine is not sufficient(Oil leakage or not filled in time) If oil leak exists, repair oil sump orreplace it;If not filled in time, fill up engine oilWater pump failure Repair or replace water pumpPoor fan Check and eliminate, if the motor fails,replace itReplace itRepair and dredge itRepair and dredge itImprove ventilationWelding peeling-off Repair weldingImperfect coolingWaterleakageWaterleakageReplace itRepair welding, otherwise replace itReplace itUse impregnation process for remedy orreplace itReplace sealEvaporation exists due to imperfectradiator capPinholes caused bycorrosion Fill pinholes with vanish, otherwisereplace itRepair, replace10. Engine Overheats170 |
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