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...
Forum Discussion
Yes,
They only did a relative compression test. Tech was already gone and the service advisor said. "well, there is another compression test that we could have done, but it would have cost money"...Duh. That's why I brought the truck in.
Per the notes on the receipt: "EEC tested and found DTC P0316 random misfire detected. Performed power balance and found dead misfire con cyl 7 and cyl 4 also dropping at times. Removed and inspected spark plugs-found no concerns. Performed coil stress test-found coils passed. Checked power and ground circuits and coil & injector using noid light-found pass.
Checked relative compression and found cyl 7 8% low. Pinpointed internal engine fault, suspect valve not seating causing compression loss. Due to mileage, recommend long block"
There are several things that just don't make sense to me:
Why will it idle fine in gear, but when in P or D is when the rough idle is most pronounced?
Can't detect a miss when driving but MPG's are down.
Guess I'm gonna have to find another place to do a proper test.
What do I need to be telling them needs to be done so I can stop wasting time taking it place to place getting incomplete diagnosis?
They only did a relative compression test. Tech was already gone and the service advisor said. "well, there is another compression test that we could have done, but it would have cost money"...Duh. That's why I brought the truck in.
Per the notes on the receipt: "EEC tested and found DTC P0316 random misfire detected. Performed power balance and found dead misfire con cyl 7 and cyl 4 also dropping at times. Removed and inspected spark plugs-found no concerns. Performed coil stress test-found coils passed. Checked power and ground circuits and coil & injector using noid light-found pass.
Checked relative compression and found cyl 7 8% low. Pinpointed internal engine fault, suspect valve not seating causing compression loss. Due to mileage, recommend long block"
There are several things that just don't make sense to me:
Why will it idle fine in gear, but when in P or D is when the rough idle is most pronounced?
Can't detect a miss when driving but MPG's are down.
Guess I'm gonna have to find another place to do a proper test.
What do I need to be telling them needs to be done so I can stop wasting time taking it place to place getting incomplete diagnosis?
