Cuts Out/Misses

SYMPTOM DESCRIPTION:
Steady pulsation or jerking that follows engine speed, usually more pronounced as engine load increases. The exhaust has a steady spitting sound at idle or low speed.



SYSTEM OR COMPONENT TO CHECK

IGNITION

CHECK:

CYLINDER MISFIRE




FUEL

CHECK

- FUEL PRESSURE: Fuel pump delivery pressure and volume.
- FUEL INJECTOR: Poor spray pattern, clogged, or stuck injector.
- FUEL PRESSURE REGULATOR: System pressure too high or too low.
- FUEL QUALITY: Contaminated fuel or incorrect octane rating.




ENGINE

CHECK:

- COMPRESSION: Perform a compression check and cylinder leak down test. Look for low compression, sticking or leaking valves, cylinder head gasket burned out between adjacent cylinders or blown into coolant passages.
- VALVE TIMING: Remove rocker covers, inspect for worn rocker arms, weak valve springs or worn cam shaft lobes
- RESTRICTIONS: Intake and exhaust system casting flash, damaged tubing, or other restrictions.