Definition: 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.
| • | Using Scan tool, check for a misfiring cylinder. |
| • | Check secondary voltage components for corrosion of EI module coil towers
and spark boot ends. Check secondary voltage using a spark plug tester and jumper
wires. |
| • | Check spark plugs for cracks, broken insulator or improper gap. |
| • | Check wires for chafes or cuts. |
| • | Check for low fuel pressure and fuel quality. |
| • | Perform injector balance test to test for clogged injector(s). |
| • | Check for proper valve timing, broken valve springs or sticking valves.
Perform Compression test. |
