Multiquip QP2TH manual Troubleshooting Engine, Engine Troubleshooting, Symptom, Possible Problem

TROUBLESHOOTING (ENGINE)

Table 7. Engine Troubleshooting

Symptom	Possible Problem	Solution
Difficult to start
	Ignition plug being bridge?	Check ignition system.
Fuel is available but spark plug will not	Carbon deposit at ignition?	Clean or replace ignition.
ignite. (Power available at high tension	Short circuit due to defective insulators?	Replace insulators.
cable).
	Improper spark gap?	Set spark plug gap to the
		correct gap.
Fuel is available but spark plug will not	Short circuit at stop switch?	Check stop switch circuit.
ignite. (Power NOT available at high		Replace stop switch if defective.
tension cable).	Ignition coil defective?	Replace ignition coil.
	Muffler clogged with carbon deposits?	Clean or replace muffler.
Fuel is available and spark plug ignites	Mixed fuel quality is inadequate?	Check fuel to oil mixture.
		Flush fuel system and replace
(compression normal).	Fuel in use inadequate (water, dust)?
		with fresh fuel.
	Air Cleaner clogged?	Clean or replace air cleaner.
	Defective cylinder head gasket?	Tighten cylinder head bolts or
Fuel is available and spark plug ignites		replace head gasket.
(compression low).	Cylinder worn?	Replace cylinder.
	Spark plug loose?	Tighten spark plug.
Operation not satisfactory
	Air cleaner clogged?	Clean or replace air cleaner.
Not enough power available	Air in fuel line?	Bleed (remove air) from fuel line.
	Fuel level in carburetor float chamber
(compression normal, no miss-firing).		Adjust carburetor float.
	improper?
	Carbon deposits in cylinder?	Clean or replace cylinder.
	Ignition coil defective?	Flush fuel system and replace
		with fresh fuel.
Not enough power available	Ignition plug often shorts?	Replace ignition wires, clean
(compression normal, miss-firing).		ignition.
	Fuel in use inadequate (water, dust)?	Flush fuel system and replace
		with fresh fuel.
	Excessive carbon deposition in	Clean or replace crankcase.
	combustion chamber?
Engine overheats.	Exhaust or muffler clogged with carbon.	Clean or replace muffler.
	Spark plug heat value incorrect?	Replace spark plug with correct
		type spark plug.

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