Suzuki VLR1800 Service Manual page 78

1A-9 Engine General Information and Diagnosis:
Condition
Engine stalls often
(Incorrect fuel/air mixture)
Engine stalls often (Fuel
injector improperly
operating)
Engine stalls often
(Control circuit or sensor
improperly operating)
Engine stalls often
(Engine internal parts
improperly operating)
Noisy engine (Excessive
valve chatter)
Noisy engine (Noise
seems to come from
piston)
Noisy engine (Noise
seems to come from cam
chain)
Noisy engine (Noise
seems to come from
clutch)
Noisy engine (Noise
seems to come from
crankshaft)
Noisy engine (Noise
seems to come from
balancer)
Noisy engine (Noise
seems to come from
transmission)
Possible cause
Defective IAP sensors or circuit.
Clogged fuel filter.
Defective fuel pump.
Defective fuel pressure regulator.
Defective ECT sensor.
Defective thermostat.
Defective IAT sensor.
Damaged or cracked vacuum hose.
Damaged or clogged ISC valve.
Defective fuel injectors.
No injection signal from ECM.
Open or short circuited wiring
connection.
Defective battery or low battery voltage. Replace or recharge.
Defective ECM.
Defective fuel pressure regulator.
Defective TP sensor.
Defective IAT sensor.
Defective CKP sensor.
Defective ECT sensor.
Defective fuel pump relay.
Defective ISC valve.
ISC incorrect learning.
Fouled spark plug.
Defective CKP sensor or ECM.
Clogged fuel hose.
Valve clearance out of adjustment.
Too large valve clearance.
Weakened or broken valve springs.
Worn tappet or cam surface.
Worn or burnt camshaft journal.
Worn down pistons or cylinders.
Combustion chamber fouled with
carbon.
Worn piston pins or piston pin bore.
Worn piston rings or ring grooves.
Stretched cam chain.
Worn sprockets.
Cam chain tension adjuster not working. Repair or replace.
Worn splines of countershaft or hub.
Worn teeth of clutch plates.
Distorted clutch plates, driven and drive. Replace.
Worn clutch release bearing.
Weakened clutch dampers.
Rattling bearing due to wear.
Worn or burnt big-end bearings.
Worn or burnt journal bearings.
Too large thrust clearance.
Worn or burnt balancer gears.
Worn or rubbing gears.
Worn splines.
Worn or rubbing primary gears.
Worn bearings.
Correction / Reference Item
Repair or replace.
Clean or replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace or repair.
Replace.
Repair or replace.
Repair or replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Reset learned value.
Clean.
Replace.
Clean.
Adjust.
Adjust.
Replace.
Replace.
Replace.
Replace.
Clean.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace the primary driven gear.
Replace.
Replace.
Replace.
Replace thrust bearing.
Replace.
Replace.
Replace.
Replace.
Replace.