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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE> 13B-1005 STEP 7. Check the fuel pressure. Refer to On-vehicle Service − Fuel Pressure Test Q: Is the fuel pressure normal? YES : Go to Step 8. symptom is eliminated. STEP 8. 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 the engine oil viscosity. d. Check the EGR valve. Then confirm that the malfunction symptom is eliminated. NO : Check that the crankshaft position sensor and timing belt cover are in the correct position. Then confirm |