High fuel consumption¶
Step 1: Is ignition system in proper condition?¶
Check battery voltage, ignition distributor, spark plugs, ignition coil, ignition timing, etc.
- Yes: Go to Step 2
- No: Repair or replace damaged ignition components
Step 2: Is engine in proper mechanical condition?¶
Check for mechanical problems: Compression, basic adjustment of valves and engine oil pressure.
- Yes: Go to Step 3
- No: Repair or replace damaged components
Step 4: Is the quantity of fuel delivered by the injectors correct?¶
Remove one valve at a time and inject fuel into a graduate for 30 seconds while engine idles. Compare quantity with that delivered by a known good injector. If quantity deviates from good injector, original valve was defective.
- Yes: Go to Step 5
- No: Replace defective injector
Step 5: Is the start valve in proper condition (no leaks)?¶
- Yes: Go to Step 6
- No: Go to Step 5-A
Step 5-A: Is the cold start valve leaking fuel?¶
Test the start valve for leaks. For this purpose clamp the fuel intake line closed with a clip. Does engine then run evenly?
- Yes: Replace start valve
Step 6: Is the air flow meter in proper condition?¶
For testing, see under Engine does not start under Step 9.
- Yes: Go to Step 7
Step 7: Is composition of exhaust gas (concentration of CO) correct?.¶
See the Air flow meter test Chart for value.
- Yes: Go to Step 8
- No: Adjust CO