{"model":"mk3","model_name":"MK3 Supra","vehicle":"Toyota Supra A70 (1986.5–1992, 7M-GE / 7M-GTE)","document":"Repair Manual","section":"EM","section_name":"Engine Mechanical","page":4,"pages_in_section":98,"title":"Troubleshooting","section_header":"Engine Mechanical — Troubleshooting","ocr_text":"TROUBLESHOOTING\n\nProblem | Possible cause | Remedy | Page\n\nEngine overheats | Cooling system problem | Troubleshoot cooling system | CO-1\n | Incorrect ignition timing | Reset timing | IG-20\n\nEngine will not crank or cranks slowly | Starting system faulty | Troubleshoot starting system | ST-2\n\nEngine will not start/hard to start (cranks OK) | Vacuum leaks\n• PCV hoses\n• EGR valve\n• Intake manifold\n• Air intake chamber\n• Throttle body\n• ISC valve | Repair as necessary |\n\n | Pulling in air between air flow meter and throttle body | Repair as necessary |\n\n | Ignition problems\n• Ignition coil\n• Igniter\n• (7M-GE)\nDistributor\n(7M-GTE)\nCam position sensor | Perform spark test | IG-5, 10\n\n | High-tension cord disconnected or broken | Inspect cord | IG-6, 11\n\n | No fuel supply to injector\n• No fuel in tank\n• Fuel pump not working\n• Fuel filter clogged\n• Fuel line clogged or leaking | Troubleshoot EFI system | FI-10\n\n | EFI system problem | Repair as necessary |\n\n | ISC system problem | Check ISC system | FI-106\n\n | Spark plugs faulty | Inspect plugs | IG-7\n\n | Low compression | Check compression | EM-20, 21\n\nRough idle, stalls or misses | Vacuum leaks\n• PCV hoses\n• EGR valve\n• Intake manifold\n• Air intake chamber\n• Throttle body\n• ISC valve | Repair as necessary |\n\n | Pulling in air between air flow meter and throttle body | |\n\n | Incorrect idle speed | Check ISC system | FI-106\n\n | Incorrect ignition timing | Reset timing | IG-20\n\n | Ignition problems\n• Ignition coil\n• Igniter\n• (7M-GE)\nDistributor\n(7M-GTE)\nCam position sensor | Perform spark test | IG-5, 10\n\n | High-tension cord faulty | Inspect cord | IG-6, 11\n\n | EFI system problems | Repair as necessary 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