Cuts Out/Misses

DEFINITION
Pulsation or jerking that follows engine speed and is usually more pronounced as engine load increases. The exhaust has a steady spitting sound at idle or low speed.

POWERTRAIN SYSTEM CHECK
Perform Chart 1 Powertrain System Check. Chart 1 Powertrain System Check

FUEL SYSTEM CHECK
Perform Chart 6C-1 Fuel System Check. Chart 6C-1 Fuel System Check

Check in particular for:

^ Fuel injectors
- not operating
- low flow rate

IGNITION SYSTEM CHECK
Perform Chart C-1: Ignition Control Performance Test. C Charts

Check in particular for:

^ High resistance, open, shorted, or arcing spark plug wires, crossfire between spark plug wires
^ Contaminated or damaged spark plugs
^ Distributor grounding points clean and tight
^ Correct ignition timing
^ Faulty ignition coil or Ignition Control (IC) module
^ Distributor cap, rotor, brush and button for moisture, cracks, dust or carbon tracking
^ Worn or loose distributor shaft gear
^ Bent distributor shaft or worn distributor shaft bushing

MECHANICAL CAUSES
Check for the following mechanical causes:

^ Intake valve deposits
^ Broken or weak valve springs
^ Collapsed lifter
^ Worn rocker arms
^ Camshaft worn
^ Bent push rods
^ Erratic Vehicle Speed Sensor (VSS) readings
^ Erratic engine RPM readings

PARK/NEUTRAL INPUT
Check Park/Neutral input using Powertrain Control Module (PCM) Diagnostic Trouble Code (DTC) PO91 diagnostic chart. P091