Tyler Haerr

I have a 2007 F150 5.4 triton and it’ll randomly misfire I just replaced plugs with champions also getting left bank or right bank lean or stuck high codes could it just be my 02 sensors causing the truck to misfire???

F150Torqued

About anything is possible --- but I'd bet the farm O2 sensors are not causing Misfires. Other way around - misfires are causing lean and/or stuck high O2 sensor codes. I'd get those 'Champions' out and throw them away. Do a 'hospital operating room' clean plug change with Motorcraft SP546 plugs, new boots (with little dab of dielectric grease on boot tip), and new springs. Clean all tarnish / corrosion from all contacts and make sure COP clips 'SNAP'.

redfishtd

Get torque pro $5 ,android phone ,cheap amazon bluetooth reader . go in test results to see which cyl building raw computer counts towards setting cel.

aalk

I have a 2007 King Ranch with the same symptoms. I noticed tonite that it misses at about 2000 RPM in idle with no load. It also misses on the road at 45-55 MPH. Plugs have been changed Motocraft, new coils installed do hear a tick coming from rear of engine. Still trying to diagnose it. It did throw codes for cylinders 5 and 8 before the coils were changed. Codes have been cleared. It is still missing but no codes. Any ideas?

dukedkt442

Check torque on those plugs, particularly the hard to reach #4 and 8s. If plugs were installed with elbow calibration, definitely confirm with an actual wrench. Then check for exhaust leaks causing the misfire...one man’s “sight tick” is another’s cacophony.