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 plugged 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. |
Table 53. Cuts-Out & Misses Diagnostics Table
