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99 Toyota 4Runner P0302 and P0301 Misfire Codes - Coil Pack or Injector Fault?

Model: 99 4Runner Fault Code: P0300 Posted: 2008-12-26 18:39

Freeze Frame Parameter Description Value DTC for which Freeze Frame was Stored P0302: Fuel System 1 Status - Closed Loop; Fuel System 2 Status - Not Supported; Calculated LOAD Value - 66.67%; Engine Coolant Temperature - 197.60°F; Short Term Fuel Trim - Bank 1 - 0.78%; Long Term Fuel Trim - Bank 1 - 10.16%; Engine RPM - 2773 rpm; Vehicle Speed Sensor - 32.93 mph; Intake Air Temperature - 78.80°F P0301: Detected misfire in cylinder 1 Additional DTC: P0300 (random misfires) I have replaced the spark plugs and wires, cleaned the MAF sensor, but the issue persists. The fault codes P0302 and P0301 are still present along with P0300. I suspect either a faulty coil pack or a defective fuel injector. Any advice or suggestions would be greatly appreciated.

Related fault codes
P0300P0301P0302P0303P0304
Comments (2)
Anonymous 2008-12-29 19:10

I recommend starting with the coil pack replacement, especially since misfires in multiple cylinders are common with failing coils. If the P0302 and P0301 codes clear after replacing one coil, it's likely a faulty coil pack. After confirming that, consider replacing the other cylinder's coil packs as well.

Anonymous 2009-01-01 14:20

What type of spark plugs did you install in your 1999 Toyota 4Runner? Ensure they are compatible with the vehicle and meet OEM specifications to avoid misfire issues.