5 and 8 misfire
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5 and 8 misfire
Ok so my 2007 f150 was having a massive missfire issue and I can't figure it out. It was giving codes for cylinders 5 8 and 7 missfire so first I did the plugs. All went well with that but the missfire was still there I didn't mark the original location of the coils but did do each side separately. Misfire codes stayed on for 5 and 8 but now number 6 instead of 7. So I figured it must be coils. I replaced the 3 coils and number 6 went away. Leaving numbers 5 and 8 still up. So I decided to check the injectors. I swapped numbers 5 and 8 with 6 and 7 and still keep getting the codes for 5 and 8 ???? Please help before I stick a rag down the gas cap and light it lol.
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If all else fails perform a compression test if these cyls fail then its very possible that a lash adjuster failed and collapsed allowing a follower to bounce off. Also always check the pins for the harness connection in the injectors and coil. Sometimes one or both will get bent enough to prevent a complete connection and can create a miss fire.