Troubleshooting (Engine) - MULTIQUIP QP3TH Operation And Parts Manual

Symptom
Difficult to start
Fuel is available but spark plug will not
ignite. (Power available at high tension
cable).
Fuel is available but spark plug will not
ignite. (Power NOT available at high
tension cable).
Fuel is available and spark plug ignites
(compression normal).
Fuel is available and spark plug ignites
(compression low).
Operation not satisfactory
Not enough power available
(compression normal, no miss-firing).
Not enough power available
(compression normal, miss-firing).
Engine overheats.
QP3TH TRASH PUMP • OPERATION AND PARTS MANUAL — REV. #9 (02/20/18) — PAGE 27

TROUBLESHOOTING (ENGINE)

Table 7. Engine Troubleshooting
Possible Problem
Ignition plug being bridge?
Carbon deposit at ignition?
Short circuit due to defective insulators?
Improper spark gap?
Short circuit at stop switch?
Ignition coil defective?
Muffler clogged with carbon deposits?
Mixed fuel quality is inadequate?
Fuel in use inadequate (water, dust)?
Air Cleaner clogged?
Defective cylinder head gasket?
Cylinder worn?
Spark plug loose?
Air cleaner clogged?
Air in fuel line?
Fuel level in carburetor float chamber
improper?
Carbon deposits in cylinder?
Ignition coil defective?
Ignition plug often shorts?
Fuel in use inadequate (water, dust)?
Excessive carbon deposition in
combustion chamber?
Exhaust or muffler clogged with carbon.
Spark plug heat value incorrect?
Solution
Check ignition system.
Clean or replace ignition.
Replace insulators.
Set spark plug gap to the
correct gap.
Check stop switch circuit.
Replace stop switch if defective.
Replace ignition coil.
Clean or replace muffler.
Check fuel to oil mixture.
Flush fuel system and replace
with fresh fuel.
Clean or replace air cleaner.
Tighten cylinder head bolts or
replace head gasket.
Replace cylinder.
Tighten spark plug.
Clean or replace air cleaner.
Bleed (remove air) from fuel line.
Adjust carburetor float.
Clean or replace cylinder.
Flush fuel system and replace
with fresh fuel.
Replace ignition wires, clean
ignition.
Flush fuel system and replace
with fresh fuel.
Clean or replace crankcase.
Clean or replace muffler.
Replace spark plug with correct
type spark plug.