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8-7 HIGH FUEL CONSUMPTION
8-8 DETONATION
Phenomenon Possible causes Remedy
1. Fuel system
1) Throttle body faulty Check or replace
2) Pulsation damper faulty Check or replace
3) Fuel pump faulty Check or replace
2. Engine core
components
1) Low compression Check or repair
2) Over cooling
Check and adjust load and/or
engine speed
Phenomenon Possible causes Remedy
1. Ignition system
malfunction
1) Poor connection of ignition system wirings
Check with failure diagnosis
system and connect properly
2) Improper or damaged spark plug Clean or replace
2. Fuel system
malfunction
1) Lean or rich air/fuel mixture Check or replace throttle body
2) Throttle body damaged Check or replace throttle body
3) Fuel lines clogged or damaged Clean or replace
4) Air mixing from connecting portion of air intake system
Connect properly or replace
gasket
3. Cylinder head
1) Carbon deposit in combustion chamber Remove and clean
2) Cylinder head gasket faulty (blow-by) Replace
4. Valve system
1) Improper valve clearance Adjust
2) Valve heat deterioration Replace
3) Valve spring deterioration Replace
4) Improper valve timing Adjust
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