Poor Performance At Low And Idle Speed - Honda MUV700 big red Service Manual

POOR PERFORMANCE AT LOW AND IDLE SPEED
1. Spark Test
Perform spa rk test.
Is there weak
or
intermittent spark?
YES _ . Faulty spark plug
• Fouled spark plug
• loose or disconnected ignition system wires
• Broken or shorted spark plug wire
• Faulty ignition coil
• Faulty CKP sensor
• Faulty engine stop switch
• Faulty ignition switch
• Faulty PCM
NO - GO TO STEP 2.
2. Fuel Pump Inspection
Inspect the fuel flow.
Is the fuel pump unit normal?
NO - Faulty fuel pump unit {page 6-36}
YES - GO TO STEP 3.
3. PGM-FI System In spection
Check the PGM-FI system.
Is the PGM- FI system normal?
NO - Faulty PGM-FI system (page
6- 11 )
YES - GO TO STEP 4.
4. Intake Air Leak Inspection
Check for leaks at the intake manifold pipes.
Are there leaks?
yeS _. loose insulator bands
• Damaged insulator
NO - GO TO STEP 5.
5. Ignition Timing Inspection
Check the ignition timing .
Is the ignition timing correct?
NO _ . Faulty PCM
• Faulty CKP sensor
YES _ . Faulty AIT system
TROUBLESHOOTING
26-5