Fuel Cut System
- When checking fuel cut system, engine RPM must be monitored.
- Tachometer is used to monitor engine RPM. For connecting of tachometer, see appropriate application under IDLE SPEED & MIXTURE in the ADJUSTMENTS - 2.4L
article.
CAUTION:
Some tachometers may not be compatible with ignition system. Consult tachometer manufacturer before connecting tachometer to system. To avoid possible damage to ignitor and/or coil, DO NOT
allow tachometer terminal to become grounded.
- Start and warm engine to normal operating temperature. Ensure all accessories are off. Gradually increase engine RPM to maintain at least specified engine speed. See FUEL CUT SYSTEM TESTING SPECIFICATION table.
FUEL CUT SYSTEM TESTING SPECIFICATION
| Application |
Engine RPM |
| Pickup |
2500 |
- Using stethoscope, check for fuel injector operating sound. Ensure when throttle lever is released, fuel injector stops operating momentarily (fuel cut RPM) and then resumes operating (fuel return RPM).
- Ensure fuel cut RPM (if available) and fuel return RPM are within specification. See FUEL CUT SYSTEM SPECIFICATIONS table. Shut engine off. Remove test equipment.
FUEL CUT SYSTEM SPECIFICATIONS
| Applicatio |
Fuel Cut RPM |
Fuel Return RPM |
| 2.4L |
| 2WD M/T |
1300 |
1000 |
| Except 2WD M/T |
1900 |
1600 |