Coyote part-throttle steady-state stumble
04-23-2018, 01:45 PM
#1
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Coyote part-throttle steady-state stumble - FIXED
My 2016 F150 SuperCrew XLT 2WD Coyote 5.0 has recently developed a part-throttle, steady-state (not during acceleration), stumble... it runs rough at part throttle when in mild cruise rpm (+/- 1200 - 2000+ revs). Otherwise, during part-throttle acceleration and under full-throttle load this motor sings. The stumble is mild, but most noticeable again, at a steady rpm, in 3rd (of 6th) at around 30 mph. It happens elsewhere, but again it is most pronounced there.
There are so many different things going on in this engine. Cams being phased (cam timing), intake manifold runner controls, EGR, etc... I just don't know where to begin looking to correct the issue. I'd rather the dealer be a last resort.
Anyone familiar with this glitch? Would a mild performance tune perhaps set things straight? I've Bing/Googled using the thread title but with no pertinent results. Anyone know of a good Coyote Mustang forum?
Thanks.
There are so many different things going on in this engine. Cams being phased (cam timing), intake manifold runner controls, EGR, etc... I just don't know where to begin looking to correct the issue. I'd rather the dealer be a last resort.
Anyone familiar with this glitch? Would a mild performance tune perhaps set things straight? I've Bing/Googled using the thread title but with no pertinent results. Anyone know of a good Coyote Mustang forum?
Thanks.
Last edited by Apples; 06-27-2018 at 08:47 PM. Reason: added info
04-30-2018, 07:22 AM
#2
Losing a coil possibly? This would be more of an issue I would have to feel for myself. My suggestion if you have access to a scan tool that shows misfire data would be to monitor the cylinders for a misfire during the stumble condition. If one cylinder is showing a miss I would swap the coil to a different cylinder and see if the misfire follows.
06-27-2018, 08:54 PM
#4
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FIXED. - Not fixed. See Post #7
DTC P0456 Evaporative Emission System Leak Detected (very small leak) <--- hey, that's what the code reader said.
A good Ford tech I was introduced to suggested replacement of the Purge Control Valve - AU5Z 9C915-B - for my '16 F150 5.0 XLT
Took me longer to find my 1/4" drive 8 mm socket and extension than it did to swap the valve.
DTC P0456 Evaporative Emission System Leak Detected (very small leak) <--- hey, that's what the code reader said.
A good Ford tech I was introduced to suggested replacement of the Purge Control Valve - AU5Z 9C915-B - for my '16 F150 5.0 XLT
Took me longer to find my 1/4" drive 8 mm socket and extension than it did to swap the valve.
Last edited by Apples; 07-21-2018 at 02:47 PM. Reason: Update
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Summers22 (07-01-2018)
06-27-2018, 09:28 PM
#5
TOTM Sept. '18
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FIXED.
DTC P0456 Evaporative Emission System Leak Detected (very small leak) <--- hey, that's what the code reader said.
A good Ford tech I was introduced to suggested replacement of the Purge Control Valve - AU5Z 9C915-B - for my '16 F150 5.0 XLT
Took me longer to find my 1/4" drive 8 mm socket and extension than it did to swap the valve.
DTC P0456 Evaporative Emission System Leak Detected (very small leak) <--- hey, that's what the code reader said.
A good Ford tech I was introduced to suggested replacement of the Purge Control Valve - AU5Z 9C915-B - for my '16 F150 5.0 XLT
Took me longer to find my 1/4" drive 8 mm socket and extension than it did to swap the valve.
She runs strong as hell. Total cost of the repair was $65, It pays to fix it yourself.
Mike
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Apples (06-27-2018)
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OCMike (06-27-2018)
07-21-2018, 02:48 PM
#7
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Well, I THOUGHT it was fixed...
Update here. ---> https://www.f150forum.com/f2/5-0-dri...2/#post5853233
Now it's fixed.
Update here. ---> https://www.f150forum.com/f2/5-0-dri...2/#post5853233
Now it's fixed.
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07-21-2018, 03:38 PM
#8
TOTM Sept. '18
iTrader: (1)
Well, I THOUGHT it was fixed...
Update here. ---> https://www.f150forum.com/f2/5-0-dri...2/#post5853233
Now it's fixed.
Update here. ---> https://www.f150forum.com/f2/5-0-dri...2/#post5853233
Now it's fixed.
Oh yeah...way off the topic of this thread...Some guys a work compared my Corvette video posted above to the Whipple truck video. The truck kicks the Z06's ***.
Mike
Last edited by OCMike; 07-21-2018 at 03:41 PM.
07-21-2018, 04:09 PM
#9
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Nothing a pair of long tube headers would not have fixed...
What'dya have to go and post THAT for?!
I'd love some! but live in the Peoples' Republic of Kaliphstan with their positively medieval emissions regs...
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OCMike (07-21-2018)