Intake Manifold Cleaning ProcedureRemove any remaining gasket and/or gasket material from thefollowing:Throttle bodyIntake manifoldClean the following intake manifold areas in solvent.Intake manifold gasket sealing areasIntake manifold passagesBrake booster hose passageEvaporative emission (EVAP) solenoid passagePositive crankcase ventilation (PCV) vacuum hosepassages
Warning:Refer toSafety Glasses Warning.
Dry the intake manifold and throttle body with compressedair.Inspection ProcedureInspect the intake manifold for the followingconditions:Damage to the throttle body bolt holes-(1)Damage, debris or restrictions to the PCV system hoseports-(3)Damage to the gasket sealing surface for the throttlebody-(2)
Inspect the intake manifold for the followingconditions:Damage, debris or restrictions to the brake vacuum boosterhose port-(3)Damage to the intake manifold boltbosses-(1)Damage to the EVAP purge solenoid mountingboss-(5)Damage, debris or restrictions to the EVAP purge solenoidport-(4)Gouges or damage to the intake manifold sealing surfaces(2)
Inspect the intake manifold sealing surface-(1)for warpage.Locate a straight edge across the intake manifold sealingsurface.Insert a feeler gauge between the intake manifold and thestraight edge. An intake manifold with warpage in excess of0.50-mm (0.020-in) must be replaced.Repair or replace the intake manifold as necessary.
Trim Height Inspection
Trim Height MeasurementTrim height is a predetermined measurement relating tovehicle ride height. Incorrect trim heights can cause the vehicleto bottom out over bumps, damage to the suspension components andsymptoms similar to wheel alignment problems. Check the trimheights when diagnosing suspensio ...