LS7 Corvette Mechanical Repair Specs (PDF) - Bakes Online

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