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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE> 13B-1009 STEP 8. Check the fuel pressure. Refer to On-vehicle Service − Fuel Pressure Test Q: Is the fuel pressure normal? YES : Check the following items, and repair or replace the defective items. a. Vacuum leak. • Broken intake manifold gasket. • Broken air intake hose. • Broken vacuum hose. • Positive crankcase ventilation valve does not operate. b. Injector clogged. Then confirm that the malfunction symptom is eliminated. NO : Repair or replace it. Then confirm that the malfunction symptom is eliminated. STEP 9. Check the ignition timing. Refer to GROUP 11A, On-vehicle Service − Ignition Timing Check Q: Is the ignition timing normal? YES : Check the following items, and repair or replace the defective items. a. Check the ignition coil and spark plugs. c. Check compression pressure. d. Check if the foreign materials (water, kerosene, etc.) got into fuel. e. Check the EGR valve. Then confirm that the malfunction symptom is eliminated. NO : Check that the crankshaft position sensor and timing cover are in the correct position. Then confirm that the |