| Problem | Possible cause | Remedy |
| Engine Overheats | Cooling system faulty Incorrect ignition timing | Troubleshoot cooling system Reset timing |
| Engine will not crank or cranks slowly | Starting system faulty | Troubleshoot starting system |
| Engine will not start/ Hard to start(cranks OK) | No fuel supply to carburetor Carburetor problems Ignition problems Vacuum leaks
Compression low Feed back system faulty | Check fuel line Troubleshoot fuel system Troubleshoot ignition system Repair as necessary Check compression Check feed back system |
| Rough idle or stalls | Vacuum leaks
Ignition problems Carburetor problems HAI system faulty Engine overheats EGR valve faulty Incorrect valve clearance Compression low Feed back system faulty | Repair as necessary Troubleshoot ignition system Troubleshoot fuel system Check HAI system Troubleshoot cooling system Check EGR valve Adjust valve clearance Check compression Check feed back system |
| Engine hesitates/ Poor acceleration | Ignition problems Vacuum leaks
Air cleaner clogged Fuel line clogged Carburetor problems CMH system faulty (Cold engine) Emmission control system problem
Engine overheats compression low Feed back system faulty | Troubleshoot ignition system Repair as necessary Check air filter Check fuel line Troubleshoot fuel system Check CMH system Check HAI system Check AAP system Check EGR system Check HAC system Troubleshoot cooling system Check compression Check feed back system |
| Engine dieseling (runs after ignition switch is turned off) | Carburetor problems Incorrect ignition timing | Troubleshoot fuel system Reset timing |
| Muffler explosion (after fire) on deceleration only | AS system faulty MC system faulty TP system faulty Deceleration fuel cut system faulty | Check AS system Check MC system Check TP system Check deceleration fuel cut system |
| Muffler explosion (after fire) all the time | Air cleaner clogged Choke system faulty Incorrect ignition timing Incorrect valve clearance | Check air filter Check choke system Reset timing Adjust valves |
| Engine backfires | Choke valve open (cold engine) Carburetor vacuum leak EBCV vacuum leak Insufficient fuel flow Incorrect ignition timing Incorrect valve clearance | Check choke system Check hoses and repair as necessary Troubleshoot fuel system Reset timing Adjust valve clearance |
| Excessive oil consumption | Oil leak PCV line clogged Piston ring worn or damaged Valve stem worn Valve stem oil seal worn or damaged | Repair as necessary Check PCV system Check rings Check valves and guides Check oil seal |
| Poor fuel mileage | Fuel leak Air cleaner clogged Ignition problems Carburetor problems EGR system always on Feed back system faulty Compression low Tires improperly inflated Clutch slips Brakes drag | Repair as necessary Check air filter Troubleshoot ignition system Troubleshoot fuel system Check EGR system Check feed back system Check compression Inflate tires to proper pressure Troubleshoot clutch Troubleshoot brakes |