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Discussion Starter #1
I am also having this issue(P0087, causing shuddering and power cut-outs on a 2010 SHO w/140000KMs). Surprisingly, the dealership stated i was having transmission issues when i brought it in, so i am extremely hesitant to return back to them... I am currently trying to resolve this issue, all the while working 50hrs a week and commuting over 250 Kms/day. I dont want to change my HPFP if it is not the issue, but i have very little time to search what to troubleshoot and even less time to actually work on it when i get home. I borrowed a Mac Tools code reader from a mechanic i know, but knowledge of functions is limited. If any one has any experience with this or is able to list items/issues i can check or look for, the help would be very much appreciated.


**UPDATE** A friend of a friend offered a fuel pressure gauge to see if the pump was actually failing, and after i set it up and went for a cruise, when i put the "pedal to the metal" the pressure almost immediately dropped down to 5-10 psi. Im fairly sure this indicates pump failure, but let me know if im assuming too much here.

Lastly, I am looking at a new pump, possibly, my question is I have shopped around a bit and Im seeing two price ranges for pumps aprx. $350 and $700. The first is a stock one and the other totes better fuel economy. I could definitely use better fuel eco., but i dont really see how a fuel pump could have much of an effect on economy..?
Thanks all.
 

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I think the only way a fuel pump would get you better fuel economy is if its not putting out enough fuel... I would go with stock, if the car is stock.
 

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Discussion Starter #3
Update... After replacing the HPFP, fuel control module, pump fuse and relay, and low pressure fuel pump assembly, I have managed to get rid of the P0087 code, but during this process(and all the while commuting 250kms/day) I have now gotten two new codes. I am seeing P0455(EVAP emission system leak detected-Large Leak) and P0457(EVAP emission system leak detected-fuel cap loose/off) codes. My car has a easy fuel seal, and i have seen how to clean/lube it(trying it after work today), but the car is still shuddering and Im not even 100% sure this EVAP code is even related to my issue. I have heard that the EVAP can make it run poorly if not working, but I dont know if it could cause these kinds of issues.

If any one with the 3.5 Ecoboost (SHO or F150) has been dealing with or already has repaired a similar issue, I would greatly appreciate the help. I need to get this thing running properly again, ASAP. Thanks.

PS. I am less than familiar with automotive electrical, but if there is any simple things i can check myself to eliminate/highlight a potential problem, I am wiling to try almost anything(even contemplating bringing it back... to the stealership...)
 

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Strike a match and throw it in that position. Spent thousands and problem keeps returning. Check the wiring on your O2 sensors, check the knock sensors under the intake, heat melts the wiring in these motors they didn't bother with putting heat shield on any of the tight fitting harnesses.
 

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Strike a match and throw it in that position. Spent thousands and problem keeps returning. Check the wiring on your O2 sensors, check the knock sensors under the intake, heat melts the wiring in these motors they didn't bother with putting heat shield on any of the tight fitting harnesses.
*P.O.S. (not position)
 
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