2013 F-150 5.0 running rough
2013 F-150 5.0L 2WD Got a CEL and took it to parts store and their OBDII reader said cyl # 7 misfire. Truck seemed to run fine and it went away pretty quickly, so I just disregarded it. About 3...
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You simply a power imbalance the most at high-load / low rpm.
When you take it somewhere else, let the know you already had a relative compression test done, and want a manual compression test on #7 (the #4 is probably just an artifact caused by #7). And also a leak down test, which will show which valve is leaky of that's the case. While they're in there, they should stick a borescope in that cylinder, and see if there's any crud hanging onto that valve causing it not to seat fully. It might just need a machined-dosed carbon cleaning!
When you take it somewhere else, let the know you already had a relative compression test done, and want a manual compression test on #7 (the #4 is probably just an artifact caused by #7). And also a leak down test, which will show which valve is leaky of that's the case. While they're in there, they should stick a borescope in that cylinder, and see if there's any crud hanging onto that valve causing it not to seat fully. It might just need a machined-dosed carbon cleaning!
