: If fuel is present, inspect the primary speed/timing sensor. A misaligned or faulty crankshaft timing ring can prevent the ECM from initiating fuel injection.
This is the core of the manual. It provides step-by-step procedures for checking pressures, timings, and electrical signals. Whether you need to adjust the valve lash or calibrate the throttle position sensor, the instructions are found here. cat c4 4 troubleshooting manual
The ignition relay sticks open. Swap it with a known good relay (e.g., headlight relay). : If fuel is present, inspect the primary
If you have the older MUI engine:
The mechanic consults the manual’s "Low Power" symptom section. The first instruction is Swap it with a known good relay (e
Coolant in combustion chamber, faulty injector, or low cylinder pressure. Excessive Black Smoke Air intake restriction, restricted exhaust, or overfueling. Engine Won't Crank Low battery voltage, faulty starter, or solenoid issues. Excessive Oil Consumption