2016 Mustang V6 will crank but not start

Cajunhunter67

New Member
May 18, 2020
2
0
1
52
Louisiana
Hi all!
This is a car I purchased for my daughter.
It does this after it has sat for a bit. If you crank right after shutting it off, the car will crank up and run.
Otherwise, You push the brake, hit the start button, and it will just turn over and never fire up. If I hit the Start/stop button, and then try again it will usually run after the third try.

I intend to have the dealer check it out, but we all know how intermittent issues get resolved....they don't.
It is starting to happen often. Almost every time, so there is a possibility it will do it for the dealer.
She is only 16 yrs old, so I don't want her broke down anywhere.
Hoping someone has experienced this issue and can give me an idea how to fix it.

Don
 
  • Sponsors(?)


74stang2togo

Oooh! CT!!!
Mod Dude
Mar 7, 2002
7,455
3,322
224
This is almost certainly a failure in the fuel pump or fuel pressure regulator.

Both are mounted in the fuel tank, what I don't know, as I haven't taken the tank down on an S550 (or opened the access panel if it has one) is whether they're separate or sold as a unit.

I see and/or fix similar issues somewhat frequently on the BMWs I work on for a living, and have seen it on other makes as well when working at other dealerships.

There are other possibilities, but all a tech would need to do to either diagnose it or get started down the right path is let it sit overnight and then press the start button without pressing the brake while the scan tool is hooked up. If it isn't still primed from the previous start, the system is bleeding down excessively. If it doesn't build the correct amount of pressure on the first try, and takes a few to do so, either the fuel pump is weak, the fuel strainer is clogged, a hose or tube inside the tank has split, or the fuel pressure regulator has failed.

Ford more than likely has a test that will let said technician figure it out if he knows what he's doing.

Being an Ecoboost, there is also the possiblity of the high-pressure fuel pump mounted to the valve cover having failed, but that will usually turn on the check engine light if there's a sensor attached to it (the HPFP failing can cause the air/fuel ratio to lean out and damage the engine, so most manufacturers monitor it directly).
 
Last edited:

Cajunhunter67

New Member
May 18, 2020
2
0
1
52
Louisiana
Thanks for the reply
Thats a huge help as it's what I thought it might be. I wasn't sure if the system had a check valve that was failing. But it definitely seems to be fuel pressure or fuel pump related. I'm not familiar with this system.
I believe you hit the nail on the head. They could let it sit for only an hour or over night. Put the laptop on it and see if the required fuel pressure is available.

I will try and get the car to the dealer this week. Will update with findings.
Thank you for the quick response.

Don
 
Thread starter Similar threads Forum Replies Date
T 2016 Mustang GT *Random Misfire's CEL* Charge Motion Valve "Flaps" in Intake Manifold 2015+ (S550) Mustang -General/Talk 2
B Tick is it bad or normal 2015+ (S550) Mustang -General/Talk 0
R roush super charger from 2014 mustang gt to 2016? 2015+ Specific Tech 0
R 2016 mustang gt 2015+ (S550) Mustang -General/Talk 0
E Electrical 2016 Mustang GT unable to communicate with the PCM 2015+ Specific Tech 0
Street Renegade 2016 Bolt-On Mustang GT 2015+ (S550) Mustang -General/Talk 0
1 2016 EcoBoost Mustang with Performance Package 2015+ Specific Tech 0
S Mustang S550 2016 Electrical Problem AC/ RADIO LIGHT/ STEERING MODE 2015+ (S550) Mustang -General/Talk 2
S Mustang S550 2016 electrical issueTail lights stucked 2015+ (S550) Mustang -General/Talk 1
M Overhead light/ Dome like 2015+ (S550) Mustang -General/Talk 3
R 2016 Mustang Ecoboost Premium 2015+ (S550) Mustang -General/Talk 3
P Fixing a Mustang 2016 Conv EcoBoost after accident, Salvaging the rear-end, trunk, taillights 2015+ Specific Tech 3
A For Sale 2016 Cobra JET Musang Coupe S550 Mustangs for Sale (2015+) 0
M Expired Hellion Twin Turbo 2016 Mustang Gt Premium S550 Mustangs for Sale (2015+) 2
DeathMetallic Electrical Disable Seatbelt Chime On 2016 Mustang 2015+ Specific Tech 5
J Expired 2016 Mustang 2.3 Ecoboost 6sp Auto Swap Kit!!! Engine and Power Adder 0
P Water In 2016 Mustang Convertible 2015+ Specific Tech 1
S Problems With New 2016 Saleen Mustang Yellow Label 2015+ (S550) Mustang -General/Talk 15
J Expired 2016 Mustang 2.3 Ecoboost 6sp Auto Swap Kit!!! S550 Mustangs for Sale (2015+) 1
M Expired 2016 Ford Mustang Gt Convertible Premium - $30000 Sf, Ca S550 Mustangs for Sale (2015+) 0
B Prepurchasing Questions For 2016 Or Later Mustang Gt 2015+ (S550) Mustang -General/Talk 8
A 2016 Mustang With Lemon Title 2015+ (S550) Mustang -General/Talk 3
Street Renegade Video Of My New Borla Exhaust 2015+ (S550) Mustang -General/Talk 47
trigger5150 SOLD 2016 Mustang Gt Premium W/ Recaro Seats S550 Mustangs for Sale (2015+) 0
J Expired 2016 Mustang Gt Supercharged; $37,000 8900 Miles- Spring Hill Tn S550 Mustangs for Sale (2015+) 0
T Setting For Shaker Pro Audio 2016 Mustang Mustang Sound & Shine All 0
O Wheels-Tires Aftermarket Rims, 18in. For 2016 Mustang 2015+ (S550) Mustang -General/Talk 3
J Rear Facing Infant Seats In 2015-2016 Mustang? 2015+ (S550) Mustang -General/Talk 2
0 Interior and Upholstery Sync 3 Screen 2015+ (S550) Mustang -General/Talk 1
asmodyus 2016 Mustang Gt/cs 2015+ (S550) Mustang -General/Talk 9
J SOLD 2016 Ford Mustang Gt S550 Mustangs for Sale (2015+) 0
BackInBlack 2015 – 2016 Mustang “venom” Rear Diffuser Fins 2015+ (S550) Mustang -General/Talk 0
S Expired Fs: 2016 Mustang Gtpp S550 Mustangs for Sale (2015+) 0
Tracy pruitt Can't Make 2016 Mustang Week This Year But With The Good Lords Help I'm In For 2017. The Welcome Wagon 1
K Can I Add Things To My Car Without Affecting My Warranty? The Welcome Wagon 2
J 2016 Mustang Gt Auto With 3:55 Rear Track Times... 2015+ (S550) Mustang -General/Talk 4
MCF84 Expired 2015/2016 Mustang Left Side Hood Vent Interior Exterior Parts 1
mitchell allard Sub For 2016 Mustang? 2015+ (S550) Mustang -General/Talk 4
Arless 2016 Mustang Gt 3.55 Rear Sets And Pony/package 2015+ (S550) Mustang -General/Talk 2
D Mustang Exhaust 2015+ (S550) Mustang -General/Talk 4
red05bullitgt Cfm Billet Valve Cover Breather Kit- 2002-2016 Mustang Gt 2005 - 2014 S-197 Mustang -General/Talk- 0
jhuttar Expired 2015-16 Mustang Gt F1c Procharger And Kooks Full Exhaust 1000+whp!!! Engine and Power Adder 0
M Ordered New 2016 Mustang Gt Premium From Factory 2015+ (S550) Mustang -General/Talk 10
LILCBRA Myrtle Beach Mustang Week 2016 1974 - 1978 Mustang II Talk & Tech 7
ConqSoft Ford Oem Black Emblems For 2016 Mustang 2015+ (S550) Mustang -General/Talk 10
Rodrigo Anyone Have Stock Track Times? 2015+ (S550) Mustang -General/Talk 7
Rodrigo New Guy Here. 2016 Mustang Gt The Welcome Wagon 3
X Trackey For 2015 2016 Mustang Gt And Gt 350 In 2016 2015+ (S550) Mustang -General/Talk 8
Jim2015 2015 / 2016 Mustang - Let's Talk About Track Times 2015+ (S550) Mustang -General/Talk 28
T Bought 2016 Mustang Gt Premium 2015+ (S550) Mustang -General/Talk 7
Similar threads