sign | Probable Cause | Elimination Method |
Unstable engine operation | Too lean or rich fuel mixture | Repair or replace carburetor |
Fuel leaks from deceleration device | Replace | |
Vacuum hose loose | Attach the vacuum hose | |
Defect in the pneumatic air intake system | Repair or replace | |
Unstable engine idling | Air filter tube disconnected | Repair or replace |
Incorrectly adjusted engine idling speed | Check ignition timing and adjust engine idling speed | |
Air damper not fully open | Repair or replace | |
Fuel overflow in the carburetor | Repair or replace | |
High or low fuel level in the carburetor | Repair or replace | |
Clogged air intake pipe | Clean or replace | |
Clogged exhaust system | Replace exhaust system | |
Engine operation is not controlled | Faulty carburetor | Repair or replace |
Vacuum hose loose | Attach the vacuum hose | |
Fuel hose dirty | Clean or replace | |
Fuel filter dirty or check valve damaged | Replace filter | |
Water in the fuel tank | Replace control valve | |
Incorrect grade of fuel | Clean the filter and pipelines, fill with clean fuel | |
Engine power reduction | Damaged catalytic converter | Replace catalytic converter |
Damaged air filter gasket | Replace gasket | |
Damaged seal between air filter housing and carburetor | Replace seal | |
Damaged intake manifold gasket | Replace gasket |