Fuel Cut System
- Install tachometer. Tachometer must be connected to proper terminals. See IDLE SPEED & MIXTURE in ADJUSTMENTS
article in the ENGINE PERFORMANCE Section.
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 engine and warm to normal operating temperature. Ensure all accessories are off. Gradually increase engine RPM to at least 2500 RPM.
- 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 return RPM is within specification. See FUEL CUT SYSTEM SPECIFICATIONS table. Shut engine off and disconnecttachometer.
FUEL CUT SYSTEM SPECIFICATIONS
| Application |
Fuel Cut RPM |
Fuel Return RPM |
| Pickup & 4Runner |
| 2.4L |
| 2WD With A/T |
1300 |
1000 |
| All Others |
1900 |
1600 |
| 3.0L |
| A/T |
1800 |
1500 |
| M/T |
1600 |
1300 |