Suzuki K6A-YH6, Technical/Repair Manual, Page: 50 / 113

6-2
DIAGNOSTIC TROUBLESHOOTING
6
Troubleshooting
Condition Probable Cause Remedy
Engine starts hard (but cranks properly). Fouled spark plug(s). Check spark plugs. (See “Spark Plugs” on
page 7-8.)
Faulty ignition coil. Check ignition coils. (See “Ignition Coils”
on page 7-8.)
Faulty fuel injector. Check fuel injectors. (See “Injectors” on
page 7-9.)
Throttle body gasket leaking air. Check throttle body and gasket. (See
“Throttle Body” on page 7-4.)
Faulty ISC (idle speed control) valve. Check ISC (idle speed control) valve. (See
“ISC (Idle Speed Control) Valve” on
page 7-3.)
Faulty throttle position sensor. Check throttle position sensor. (See
“Throttle Position Sensor” on page 7-3.)
Faulty manifold pressure sensor. Check pressure sensor.(See “Pressure
Sensor” on page 7-3.)
Intake manifold leaking air. Check intake manifold and gasket. (See
“Intake Manifold” on page 7-4.)
Exhaust restriction. Check exhaust manifold. (See “Exhaust
Manifold” on page 7-7.)
Poor idling. Fouled spark plug(s). Check spark plugs. (See “Spark Plugs” on
page 7-8.)
Faulty ignition coil. Check ignition coils. (See “Ignition Coils”
on page 7-8.)
Faulty oxygen sensor. Check oxygen sensor. (See “Oxygen
Sensor” on page 7-6.)
Faulty ISC (idle speed control) valve. Check ISC (idle speed control) valve. (See
“ISC (Idle Speed Control) Valve” on
page 7-3.)
Valve clearance adjustment. Check valve clearance. (See “Valve
Clearance Check and Adjustment” on
page 5-3.)
Faulty valve spring. Check valve springs. (See “Valves” on
page 7-27.)
Insufficient engine power. Fouled spark plug(s). Check spark plugs. (See “Spark Plugs” on
page 7-8.)
Faulty ignition coil. Check ignition coils. (See “Ignition Coils”
on page 7-8.)
Faulty fuel injector. Check fuel injectors. (See “Injectors” on
page 7-9.)
Valve clearance adjustment. Check valve clearance. (See “Valve
Clearance Check and Adjustment” on
page 5-3.)
Vacuum leak. Check intake manifold vacuum. (See
“Intake Manifold Vacuum Test” on
page 5-2.)
Cylinder compression leakage. Check cylinder compression. (See
“Cylinder Compression Test” on
page 5-6.)
Faulty piston ring(s). Check piston rings. (See “Connecting
Rods and Pistons” on page 7-38.)
Faulty head gasket. Check head gasket. (See “Cylinder Head”
on page 7-24.)
Incorrect fuel. Use proper fuel.