TOHATSU BFT250A Service Manual page 103

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8. Fuel injector inspection
Inspect the fuel injector (page 5-116).
Is the fuel injector normal?
YES
NO
9. IAC valve inspection
Replace the IAC valve with a new one and start the engine.
Is the engine speed stable during idle and trolling?
YES
NO
ENGINE SPEED DOES NOT INCREASE
1. Throttle cable inspection
Inspect the throttle cable (page 3-11).
Is the throttle cable adjustment correct?
YES
NO
2. Propeller inspection
Match the propeller.
Is the propeller correct?
YES
NO
3. Fuel Flow Inspection
Inspect the fuel flow (page 5-113).
Is the fuel flow within specification?
YES
NO
4. Pressure regulator inspection
Inspect the fuel pressure and record it (page 5-111).
Disconnect the pressure regulator vacuum tube.
Inspect the fuel pressure.
Is the fuel pressure higher with the vacuum tube disconnected?
YES
NO
5. Valve clearance inspection
Inspect the valve clearance (page 3-15).
Is the valve clearance correct?
YES
NO
– GO TO STEP 9.
– • Repair the open or short circuit fuel injector wire
• Faulty fuel injector
– Faulty original IAC valve.
– Replace the ECM with a new one and recheck.
– GO TO STEP 2.
– Improper throttle cable adjustment (page 3-11).
– GO TO STEP 3.
– Propeller mismatched.
– GO TO STEP 4.
– • Clogged fuel strainer (Low pressure side) (page 3-27)
• Clogged water separator (page 5-93)
• Clogged or damaged fuel tube
• Faulty fuel pump (Low pressure side)
• Clogged vapor separator air vent tube or filter
• Clogged fuel feed hose
• Clogged fuel strainer (High pressure side) (page 5-106)
• Faulty vapor separator (page 5-115)
• Faulty fuel pump (high pressure side)
– GO TO STEP 5.
– Faulty pressure regulator.
– GO TO STEP 6.
– Improper valve clearance adjustment (page 3-15).
TROUBLESHOOTING
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