2.7 Ecoboost MIL Light
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2.7 Ecoboost MIL Light
I have a new 2015 F150 with the 2.7 Eco Boost engine. With roughly 6000 miles, I am currently on a road trip.
Today the check engine light came on and feel a very rapid power surge. Fortunately I have a cheap code reader and the fault code said misfire-#4 cylinder. I cleared the code but could still feel the rapid power surge during moderate acceleration. With the check engine light still off, speed above 60 mph, the surge would be felt when the code reader indicated roughly 50 percent throttle position.
I can still drive my truck with staying below 70 mph but can't push the throttle to much or the problem is felt. Even when I feel the rapid power surge, if I don't stay there long, the MIL light stays off.
If I accelerate from a stop I can still feel the problem but since I am at a higher engine RPM, the power surge is barely noticeable. I assume the higher RPM reduces how much I feel the problem.
From what I can tell, this issue is similar to the problems reported in earlier 3.5 Eco Boost engines. Can this be corrected by re-flashing the computer?
Today the check engine light came on and feel a very rapid power surge. Fortunately I have a cheap code reader and the fault code said misfire-#4 cylinder. I cleared the code but could still feel the rapid power surge during moderate acceleration. With the check engine light still off, speed above 60 mph, the surge would be felt when the code reader indicated roughly 50 percent throttle position.
I can still drive my truck with staying below 70 mph but can't push the throttle to much or the problem is felt. Even when I feel the rapid power surge, if I don't stay there long, the MIL light stays off.
If I accelerate from a stop I can still feel the problem but since I am at a higher engine RPM, the power surge is barely noticeable. I assume the higher RPM reduces how much I feel the problem.
From what I can tell, this issue is similar to the problems reported in earlier 3.5 Eco Boost engines. Can this be corrected by re-flashing the computer?
Cross-Country
Joined: Oct 2015
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If there is an actual misfire, a computer reflash won't fix it. Usually caused by a bad spark plug, coil, fuel injector or a mechanical problem in that cylinder. Driving with a misfire is probably putting raw fuel through your catalytic converter(s) which may ruin the converters. Get it fixed. It's probably a warranty issue with this new of a vehicle.
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From: Isanti, MN
Yep, this one needs to get looked at. I've never heard a misfire described as a "power surge" before, so I"m fairly confident something else is going on. You may have a problem with a wastegate causing an overboost condition. Just a WAG, but there are probably more trouble codes than you are seeing.
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Joined: Jun 2014
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From: Lewisberry, Penn
BLUF: Get it to a dealer and have it looked at.
I know historically the misfire codes were counters, meaning they would turn on only after a certain number of misfires over a given period. I can't quite tell from your post if the MIL has been tripped multiple times or you just mean you felt a concern without tripping it. If it has been a few times then you've likely found the range that the misfire is occurring in and should use that to help describe it to the service department. If you haven't seen the light again then the two concerns may be unrelated.
I know historically the misfire codes were counters, meaning they would turn on only after a certain number of misfires over a given period. I can't quite tell from your post if the MIL has been tripped multiple times or you just mean you felt a concern without tripping it. If it has been a few times then you've likely found the range that the misfire is occurring in and should use that to help describe it to the service department. If you haven't seen the light again then the two concerns may be unrelated.
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Ignition Coil
Thanks for all the feedback. Jumped the gun a little when I had read that not everyone was convenced the 3.5 misfire was due to water condensation. More reading does seem to clearly point in that direction.
Since I was traveling, I just found a shop that could switch coil positions and the misfire went from cylinder 4 to cylinder 1.
I also used the wrong term being power surge. At moderate load but low engine rpm, I was surprised at how much the truck would shutter as if going over a bunch of small speed bumps. Very different than accelerating from a stop with higher engine speed.
Since I was traveling, I just found a shop that could switch coil positions and the misfire went from cylinder 4 to cylinder 1.
I also used the wrong term being power surge. At moderate load but low engine rpm, I was surprised at how much the truck would shutter as if going over a bunch of small speed bumps. Very different than accelerating from a stop with higher engine speed.
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