Hard Start Diagnostics🔗
Note
- Hard start issues occur when the engine cranks but does not start for a long time. Engine may also eventually run or may start but immediately die.
| Checks | Action |
|---|---|
| Preliminary Checks | Ensure the user is using the correct starting procedure (if applicable). |
| Sensor Checks | - Compare the ECT with the ambient air temperature on a cold start. If the coolant temperature reading is more than 10 degrees greater or less than the ambient air temperature, check for high resistance in the ECT sensor circuit. - Check the TPS and foot pedal position sensor connections. |
| Fuel System Checks | - Check for intake system leakage. |
| Ignition System Checks | - Check for proper ignition voltage. - Check the spark plugs are properly gapped. - Check the spark plugs for any irregular wear, cracks, heavy deposits, and burned electrodes. |
| Engine Mechanical Checks | Check for all of the below items: - Vacuum leaks - Improper valve timing - Low compression - Improper valve clearance - Worn or weak valve springs - Worn camshaft lobes |
| Exhaust System Checks | - Check the exhaust system for any restrictions and damaged pipes |