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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE> 13B-781 STEP 8. Check the ignition coil. − On-vehicle Service − Ignition Coil Check . Q: Are there any abnormalities? YES : Replace the ignition coil. Then confirm that the malfunction symptom is eliminated. NO : Go to Step 9. STEP 9. Check the compression pressure. − Compression Pressure Check Q: Is the compression pressure normal? YES : Check the engine oil viscosity. Then confirm that the malfunction symptom is eliminated. NO : Repair it. Then confirm that the malfunction symptom is eliminated. INSPECTION PROCEDURE 11: When the Engine Is Hot, It Stalls at Idle (die out). . COMMENT • In cases such as the above, the ignition system, air/fuel mixture or compression pressure may be . TROUBLESHOOTING HINTS (The most • Malfunction of the fuel pump system. • Malfunction of the ignition system. • Poor compression • Malfunction of the EGR system • Improper operation of the PCV valve. • Vacuum leak. • Malfunction of the ECM. DIAGNOSIS Required Special Tools: • MB991958: Scan Tool (M.U.T.-III Sub Assembly) • MB991824: V.C.I. • MB991827: USB Cable • MB991910: Main Harness A STEP 1. Check if the EGR valve sounds during YES : Go to Step 2. − Exhaust Gas Recirculation (EGR) System − EGR Valve (Stepper Motor) Check |