Troubleshooting - Kia Sportage Workshop Manual

TROUBLESHOOTING

Symptom
Engine misfire with
abnormal internal
lower engine noises.
Engine misfire with
abnormal valve train
noise.
Engine misfire with
coolant consumption
Engine misfire with
excessive oil
consumption
Engine noise on
start-up, but only
lasting a few
seconds.
Upper engine noise,
regardless of engine
speed.
Suspect area
Loose or improperly installed engine flywheel.
Worn piston rings.
(Oil consumption may or may not cause the
engine to misfire.)
Worn crankshaft thrust bearings.
Stuck valves.
(Carbon buildup on the valve stem can cause the
valve not to close properly.)
Excessive worn or mis-aligned timing chain.
Worn camshaft lobes.
• Faulty cylinder head gasket and/or cracking or
other damage to the cylinder head and engine
block cooling system.
• Coolant consumption may or may not cause
the engine to overheat.
Worn valves, valve guides and/or valve stem oil
seals.
Worn piston rings.
(Oil consumption may or may not cause the
engine to misfire)
Incorrect oil viscosity.
Worn crankshaft thrust bearing.
Low oil pressure.
Broken valve spring.
Worn or dirty valve lifters.
Remedy
Repair or replace the flywheel as
required.
Inspect the cylinder for a loss of
compression.
Repair or replace as required.
Replace the crankshaft and bearings
as required.
Repair or replace as required.
Replace the timing chain and
sprocket as required.
Replace the camshaft and valve lifers.
• Inspect the cylinder head and
engine block for damage to the
coolant passages and/or a faulty
head gasket.
• Repair or replace as required.
Repair or replace as required.
Inspect the cylinder for a loss of
compression
Repair or replace as required.
Drain the oil.
Refill with the correct viscosity oil.
Inspect the thrust bearing and
crankshaft.
Repair or replace as required.
Repair or replace as required.
Replace the valve spring.
Replace the valve lifters.