Subaru Robin EH72 LP/NG - Manual (Page 24)

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8-2 STARTING DIFFICULTIES
Phenomenon Possible causes Remedy
1 . Low engine
speed at
starting
1) Battery discharged Charge battery
2) Poor connection between battery and starter motor Clean or repair
3) Poor connection between battery and ground Clean or repair
4) Electric starter faulty Repair or replace
5) Improper engine oil
Replace with recommended
engine oil
2 . Ignition
system
malfunction
Spark plug
* Improper spark plug gap
* No insulation
* Carbon deposits
Adjust
Replace
Clean
Ignition coil
* No insulation or discontinuity
* Poor connection or discontinuity of ignition code
Check with failure diagnosis system
Replace
Repair or replace
Improper air gap between ignition coil and flywheel Adjust
3 . Fuel system
malfunction
1) No fuel in fuel tank Refill
2) Fuel pump clogged Clean or replace
3) Fuel hose clogged or pinched Clean or replace
4) Air mixing into fuel lines Check and adjust connecting portion
5) Improper gasoline or water infiltration Replace
6) Throttle body
* Poor connection or discontinuity of throttle body (ECU) .
* Clogged or damaged
* Improper operation of throttle valve
Repair or replace .
Check with failure diagnosis system
Clean or replace
Check and adjust or replace
7) Poor connection of fuel pump wiring Check with failure diagnosis system
8) Improper pulsation damper Replace
9) Improper temperature sensor
Check with failure diagnosis system
and replace
4 . Engine core
components
malfunction
1) Insufficient tightening of cylinder head bolts Check and retighten
2) Wear of piston, piston ring and/or cylinder Repair or replace
3) Improper contact of valve and seat Repair
4) Valve seizure Repair
5) Improper valve clearance Adjust
6) Intake manifold gasket leakage
Retighten intake manifold bolts or
replace gasket
7) Throttle body gasket leakage
Retighten cleaner adapter flange
nut or replace gasket
8) Insufficient tightening of spark plug Retighten