LS7 Corvette Mechanical Repair Specs (PDF) - Bakes Online

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Print Preview Version 8.0 PubTeX output 2006.06.15:1036 File: C:\DOCUME~1\PCOMPO~1.IGS\LOCALS~1\Temp\.aptcache\2006LS7/tfa01804.dvi User: PComposer Page: 282006 Y Car GMX245 Corvette7.0L (LS7) Engine MechanicalVisual/Physical Inspection• Inspect for aftermarket devices which could affect the operation of the engine. Refer to Checking AftermarketAccessories .• Inspect the easily accessible or visible system components for obvious damage or conditions which could causethe symptom.• Inspect for the correct oil level, proper oil viscosity, and correct oil filter.• Verify the exact operating conditions under which the concern exists. Note factors such as engine RPM, ambienttemperature, engine temperature, amount of engine warm-up time, and other specifics.• Compare the engine sounds, if applicable, to a known good engine and make sure you are not trying to correcta normal condition.IntermittentTest the vehicle under the same conditions that the customer reported in order to verify the system is operating properly.Symptom ListRefer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:• Base Engine Misfire without Internal Engine Noises• Base Engine Misfire with Abnormal Internal Lower Engine Noises• Base Engine Misfire with Abnormal Valve Train Noise• Base Engine Misfire with Coolant Consumption• Base Engine Misfire with Excessive Oil Consumption• EngineNoiseonStart-Up,butOnlyLastingaFewSeconds• Upper Engine Noise, Regardless of Engine Speed• Lower Engine Noise, Regardless of Engine Speed• Engine Noise Under Load• Engine Will Not Crank - Crankshaft Will Not Rotate• Coolant in Combustion Chamber• Coolant in Engine Oil• Engine Compression Test• Cylinder Leakage Test• Oil Consumption Diagnosis• Oil Pressure Diagnosis and Testing• Oil Leak Diagnosis• Crankcase Ventilation System Inspection/Diagnosis• Drive Belt Chirping Diagnosis• Drive Belt Squeal Diagnosis• Drive Belt Whine Diagnosis• Drive Belt Rumbling Diagnosis• Drive Belt Vibration Diagnosis• Drive Belt Falls Off Diagnosis• Drive Belt Excessive Wear Diagnosis• Drive Belt Tensioner DiagnosisDiagnostic Information and Procedures1555001Base Engine Misfire without Internal Engine NoisesBase Engine Misfire without Internal Engine Noises:Engine Mechanical - 4.8L, 5.3L, and 6.0L28 of 272
Print Preview Version 8.0 PubTeX output 2006.06.15:1036 File: C:\DOCUME~1\PCOMPO~1.IGS\LOCALS~1\Temp\.aptcache\2006LS7/tfa01804.dvi User: PComposer Page: 292006 Y Car GMX245 Corvette7.0L (LS7) Engine MechanicalCauseFuel injector harness connectors are connected to the incorrectfuel injectors/cylinders.Abnormalities, such as severe cracking, bumps, or missingareas in the accessory drive beltAbnormalities in the accessory drive system and/orcomponents may cause engine RPM variations and lead to amisfire DTC. A misfire code may be present without an actualmisfire condition.Worn, damaged, or mis-aligned accessory drive componentsor excessive pulley runoutMayleadtoamisfireDTC.A misfire code may be present without an actual misfirecondition.Loose or improperly installed flywheel or crankshaft balancerA misfire code may be present without an actual misfirecondition.Restricted exhaust systemA severe restriction in the exhaust flow can cause significantloss of engine performance and may set a DTC. Possiblecauses of restrictions include collapsed or dented pipes orplugged mufflers and/or catalytic converters.Improperly installed or damaged vacuum hosesImproper sealing between the intake manifold and cylinderheads or throttle bodyImproperly installed or damaged MAP sensorThe seal of the MAP sensor should not be torn or damaged.Worn or loose rocker armsThe rocker arm bearing end caps and/or needle bearingsshould be intact and the rocker arm in the proper position.Worn or bent valve pushrodsStuck valvesCarbon buildup on the valve stem can cause the valve not toclose properly.Excessively worn or mis-aligned timing chainWorn camshaft lobesExcessive oil pressureA lubrication system with excessive oil pressure may lead toexcessive valve lifter pump-up and loss of compression.CorrectionRelocate the fuel injector harness connectors, as necessary.Replace the drive belt. Refer to Drive Belt Replacement -Accessory .Inspect the components and repair or replace, as required.Repair or replace the flywheel and/or balancer, as required.Refer to Engine Flywheel Replacement or Crankshaft BalancerReplacement .Repair or replace, as required.Repair or replace, as required.Replace the intake manifold, gaskets, cylinder heads, and/orthrottle body, as required.Repair or replace the MAP sensor, as required.Replace the valve rocker arms, as required.• Replace the pushrods.• Inspect the top of the pistons for valve contact. If thetop of the piston shows valve contact, replace the piston andpin assembly.Repair or replace, as required.Replace the timing chain and sprockets, as required.Replace the camshaft and valve lifters.1. Perform an oil pressure test. Refer to Oil PressureDiagnosis and Testing .2. Repair or replace the oil pump, as required.29 of 272
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LS7 Corvette Mechanical Repair Specs (PDF) - Bakes Online

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