No-Start/Normal Crank, Erratic Start Or Crank, Hard Start Or Long Crank Or Stalls After Start
WARNING: This page is about a different variant/trim than selected.
- Preliminary Checks
Check engine oil level and quality (CG4/SH). Ensure proper engine oil dipstick is being used. Perform the following in order; TEST 2: SUFFICIENT CLEAN FUEL , TEST 3: CHECK ENGINE OIL LEVEL and TEST 4: INTAKE RESTRICTION under ENGINE PERFORMANCE DIAGNOSTIC PROCEDURES in SYSTEM & COMPONENT TESTING - 7.3L DIESEL article. Repair as necessary. If no problems are indicated, go to next step. - Check High-Pressure Oil Pump Reservoir Level
Check engine oil level in high pressure oil pump reservoir. Reservoir is located on top of engine, near generator. See Fig 1. Oil level should be within 1" (25.4 mm) of inspection plug. Go to next step. - Attempt To Start Engine
Add oil to reservoir if necessary and attempt to start engine. If engine starts and stalls after about 15 seconds, lubrication system is not supplying enough oil to high pressure oil pump reservoir. Perform HARD START/NO-START - DRY RESERVOIR symptom check. If engine does not stall after about 15 seconds, go to step 5. If engine does not start, go to next step. - Check Fuel Pump Pressure
Perform TEST 8C: ELECTRIC FUEL PUMP PRESSURE TEST under ENGINE PERFORMANCE DIAGNOSTIC PROCEDURES in SYSTEM & COMPONENT TESTING - 7.3L DIESEL article. Repair as necessary. If fuel pump pressure is okay, go to next step. - Perform KOEO On-Demand Self-Test
Perform KOEO ON-DEMAND SELF-TEST under QUICK TEST in SELF-DIAGNOSTICS - 7.3L DIESEL article. If any DTC are present, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - 7.3L DIESEL article and perform appropriate SYSTEM TESTS. If no DTCs are present, go to next step. - Perform KOEO Injector Electrical Self-Test
Perform KOEO INJECTOR ELECTRICAL SELF-TEST under QUICK TEST in SELF-DIAGNOSTICS - 7.3L DIESEL article. If no DTCs are present, go to step 8. If any DTCs are present, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - 7.3L DIESEL article and perform appropriate SYSTEM TESTS. If self-test does not run, go to next step. - Repeat KOEO Injector Electrical Self-Test
Repeat KOEO INJECTOR ELECTRICAL SELF-TEST for each injector with one injector connector at valve cover disconnected at a time. If KOEO INJECTOR ELECTRICAL SELF-TEST now runs, remove valve cover and inspect disconnected valve cover wiring harness for a pinched or grounded injector wire. If KOEO INJECTOR ELECTRICAL SELF-TEST still does not run, check Injector Driver Module (IDM) power and ground circuits. Go to TEST NC: INJECTOR DRIVER MODULE ENABLE , step 6) under SYSTEM TESTS in SELF-DIAGNOSTICS - 7.3L DIESEL article. If power and ground circuits are okay, check for short to ground in IDM or injector circuits. Go to TEST NA: INJECTOR DRIVE CIRCUIT OPERATION , step 29) under SYSTEM TESTS in SELF-DIAGNOSTICS - 7.3L DIESEL article. Repair as necessary. If all circuits are okay, go to next step. - Check Parameter Identifications
Using scan tool, check Parameter Identifications (PIDs). Perform TEST 9A: CHECK VPWR WHILE CRANKING , TEST 9B: CHECK RPM SIGNAL WHILE CRANKING , TEST 9C: MONITOR ICP PID WHILE CRANKING and TEST 9D: CHECK FUEL PULSE WIDTH WHILE CRANKING under HARD START/NO-START DIAGNOSTIC PROCEDURES in SYSTEM & COMPONENT TESTING - 7.3L DIESEL article. If PID values are within specification, go to next step. If PID values are not within specification, perform appropriate system test under SYSTEM TESTS in SELF-DIAGNOSTICS - 7.3L DIESEL article. - Check Glow Plug Relay Power Circuit
On models with California emissions, a problem may exist in the glow plug system. Check for DTC that may be stored in PCM memory. Perform QUICK TEST in SELF-DIAGNOSTICS - 7.3L DIESEL article. Service any DTCs that are present. On models with Federal emissions, disconnect glow plug relay. Glow plug relay is located on top right side of engine. See Fig 2. Measure voltage between chassis ground and Black/Orange wire at glow plug relay. If battery voltage is present, go to next step. On Econoline, if battery voltage is not present, repair open in Black/Orange wire or replace Gray fuse links "D" and/or "E". Gray fuse links are located in alternator rectifier system harness, near take off to starter relay. On Excursion and F250-550, if battery voltage is not present, repair open in Black/Orange wire or replace Gray fuse links "C" and/or "D". Gray fuse links are located in alternator rectifier system harness, near take off to starter relay. - Check Glow Plug Relay
To check glow plug relay, perform TEST KC: GLOW PLUG SYSTEM (FEDERAL EMISSIONS) , step 7) under SYSTEM TESTS in SELF-DIAGNOSTICS - 7.3L DIESEL article. - Check Glow Plugs
To check glow plugs, perform TEST KC: GLOW PLUG SYSTEM (FEDERAL EMISSIONS) , step 9) under SYSTEM TESTS in SELF-DIAGNOSTICS - 7.3L DIESEL article. - Check Glow Plug Connectors
To check glow plug connectors, perform TEST KC: GLOW PLUG SYSTEM (FEDERAL EMISSIONS) , step 10) under SYSTEM TESTS in SELF-DIAGNOSTICS - 7.3L DIESEL article.
NOTE:
Perform the following 2 steps if difficult to start in cold temperatures.