Suzuki VLR1800, Service Manual

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