BASE ENGINE MISFIRE WITH ABNORMAL INTERNAL LOWER ENGINE NOISES
excessive valve lifter pump-up and loss of compression.
Testing
.
z
Repair or replace the oil pump as
required.
Faulty cylinder head gaskets and/or cracking or other
damage to the cylinder heads and engine block cooling
system passages - Refer to
Diagnostic Starting Point -
Engine Cooling
in Engine Cooling.
Coolant consumption may or may not cause the engine to
overheat.
z
Inspect for spark plugs saturated by
coolant. Refer to
Spark Plug
Inspection
in Engine Controls -
5.7L.
z
Inspect the cylinder heads, engine
block, and/or head gaskets. Refer to
Coolant in Combustion Chamber
.
z
Repair or replace as required.
Worn piston rings
Oil consumption may or may not cause the engine to
misfire.
z
Inspect the spark plugs for oil
deposits. Refer to
Spark Plug
Inspection
in Engine Controls -
5.7L.
z
Inspect the cylinders for a loss of
compression. Refer to
Engine
Compression Test
.
z
Perform cylinder leak down and
compression testing to identify the
cause. Refer to
Cylinder Leakage
Test
.
z
Repair or replace as required.
A damaged crankshaft reluctor wheel
A damaged crankshaft reluctor wheel can result in different
symptoms depending on the severity and location of the
damage.
z
Systems with electronic communications - DIS or coil
per cylinder - and severe reluctor ring damage may
exhibit periodic loss of crankshaft position, stop
delivering a signal, and then re-sync the crankshaft
position.
z
Systems with electronic communication - DIS or coil
per cylinder - and slight reluctor ring damage may
exhibit no loss of crankshaft position and no misfire
may occur. However, a P0300 DTC may be set.
z
Systems with mechanical communications, high
voltage switch, and severe reluctor ring damage may
cause additional pulses and effect fuel and spark
delivery to the point of generating a P0300 DTC or
P0336.
Replace the sensor and/or crankshaft as
required.
2004 Chevrolet Corvette
2004 ENGINE PERFORMANCE Engine Mechanical (Introduction) - 5.7L - Corvette
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