Troubleshooting; Engine Starts Hard (But Cranks Properly); Poor Idling; Insufficient Engine Power - Suzuki K6A-YH6 Technical/Repair Manual

DIAGNOSTIC TROUBLESHOOTING

Troubleshooting

Condition

Engine starts hard (but cranks properly).

Poor idling.

6

Insufficient engine power.

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