Cuts-Out & Misses Diagnostics

Note

• Cut-out and misses issues occur when the engine begins jerking that follows engine speed, usually pronounced as the engine load increases but normally felt below 2,000 RPM. The exhaust has a steady spitting sound at idle, low speed, or hard acceleration for the fuel starvation that can cause the engine to cut-out.

Checks	Action
Preliminary Checks	N/A
Ignition System Checks	1. Start the engine. 2. Check ignition for proper voltage output with a spark tester. 3. Check for any cylinder misfires. 4. Verify all spark plugs are gapped correctly. Remove all spark plugs and check for the below conditions: - Burned electrodes - Any and all deposits - Improper spark plug gaps - Any and all wear and tear Check the secondary ignition for the below conditions: - Ignition wires for arcing and proper routing - Ignition coils for any cracks and carbon tracking - Cross-firing
Engine Mechanical Checks	Perform a cylinder compression check for all cylinders. Check all cylinders for the following conditions: - Worn rocker arms - Worn camshaft lobes - Broken valve springs - Improper valve timing - Improper valve clearance
Fuel System Checks	Check the fuel system for the below conditions: - Low pressure - Plugged filters
Additional Checks	Check the routing for the secondary wires and their ground circuits.