Firing Order
The firing order for the 2000 Ford Ranger 2.5L 4-cylinder engine is 1-3-4-2. Cylinders are numbered front to rear: cylinder 1 at the front timing belt end, followed by 2, 3, and 4 at the rear. Ensure spark plug wires are connected correctly to the ignition coil or distributor in this sequence to prevent misfires.
Quick Troubleshooting Tips for Misfires
- Check spark plugs: Inspect for fouling, cracks, or incorrect gap (spec: 0.043-0.047 inches); replace any damaged plugs.
- Verify ignition wires and coil: Test for damage using a multimeter; replace if resistance is out of range or if arcing occurs.
- Scan OBD-II codes: Retrieve diagnostic trouble codes (e.g., P0300-P0304) to identify specific cylinder misfires.
- Inspect fuel system: Ensure adequate fuel pressure (35-45 psi); check injectors for clogs or leaks.
- Detect vacuum leaks: Spray throttle cleaner around intake hoses and gaskets; leaks cause hissing and lean conditions.
- Perform compression test: Measure all cylinders (minimum 125 psi); significant variations indicate mechanical issues like head gasket failure.