Engine Stops After Running Briefly; Engine Will Not Idle; Engine Backfires Or Misfires - Toro AC-1 Service Manual

Engine Stops After Running Briefly
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possible Cause
Partially plugged fuel tank cap vent
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Dirty or plugged air filter
Water in fuel
Air leak at carburetor base gasket
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Dirty carburetor fuel inlet needle or passage
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Faulty carburetor diaphragm
Losing compression
Engine Will Not Idle
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Clean or replace air filter
Drain tank and blow out lines
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Tighten carburetor mounting fasteners or
replace carburetor base gaskets
Replace fuel inlet needle or clean out carburetor
Replace diaphragm
Replace piston rings or gaskets or
overhaul engine
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Possible
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Cause
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Remedy
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Improperly adjusted carburetor
Dirty or plugged air filter Clean or e
Faulty carburetor diaphragm Replace carburetor aphragm
Faulty carburetor inlet seat gasket Replace carburetor inlet seat gasket
Leaking crankshaft seal ace
Adjust carburetor
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Scored cylinder or low compression
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Overhaul engine
Engine Backfires Or Misfires
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possible Cause
Fouled, improperly gapped or broken spark plug
Shorted ignition module leads
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Rocker arm to valve clearance is out of adjustment
Weak valve spring
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Check for loose or bare wires or loose
assembly and corrector replace ignition module
Adjust rocker arm to valve clearance
Replace valve spring
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