Ford

Have Ford Questions? Ask a Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Ford

2013 6.2 Raptor power drops at around 4-4500 rpm when

Customer Question
accelerating and hangs in gear...
2013 6.2 Raptor power drops at around 4-4500 rpm when accelerating and hangs in gear at wot. Graph on tuner shows "line pressure" drops off by 1/3 at the same time. I am not sure but thinking this is fuel line pressure. Pressure is around 900 kPa and drops to 660.
Submitted: 3 months ago.Category: Ford
Show More
Show Less
Ask Your Own Ford Question
Answered in 6 minutes by:
9/18/2017
Ford Mechanic: Chris (aka- Moose), Technician replied 3 months ago
Chris (aka- Moose)
Chris (aka- Moose), Technician
Category: Ford
Satisfied Customers: 49,440
Experience: 16 years experience
Verified

Welcome, I'm Chris (aka Moose).

  • Although I work here everyday, please understand it is not all day and rarely morning time.
  • To get the most from me and the best experience, please give me the best details you can.
  • The website will offer you a phone call option for more $$. Some I do fulfill and some I do not.
  • Thanks, let's get started. If I upload dropbox links, without the app use the box in the top right for direct download.

Graph on tuner shows "line pressure" drops off by 1/3 at the same time. I am not sure but thinking this is fuel line pressure. Are you saying you do not know if you are monitoring fuel pressure on your graph?

When it hangs in gear is this in all gears or just the higher gears?

Ask Your Own Ford Question
Customer reply replied 3 months ago
It happens when trying to pass at Highway speed or when downshifting to go up a hill while towing. It will drop to 3rd and rpms will go to around 4000 and then forward speed stops increasing and rpms rise real slow. It happens on acceleration as well from stop. It will hang in the lower gear until rpm eventually makes it to around 5k or throttle is let up.
The sensor is labeled line pressure. Up to 4k it reads roughly 135 psi and suddenly it drops to around 69.
Ford Mechanic: Chris (aka- Moose), Technician replied 3 months ago

Key in engine off that reading your monitoring does it register a pressure that way?

If you are not running it at hard throttle just normal driving, does it shift right and not have a power loss?

Current miles and at what mileage did this begin?

Ask Your Own Ford Question
Customer reply replied 3 months ago
At idle it reads about 69 I believe. Not sure about when the engine is off. It does seem to shift fine when driving around normally or taking off slow. Power is strong til it isn't. If I manually shift it before it reaches 4k it will shift fine but is sluggish because it falls back to a low rpm where power isn't ideal.
It started a couple days ago, mileage is right around 158k.
Ford Mechanic: Chris (aka- Moose), Technician replied 3 months ago

Can you check that pressure reading with the key on engine off so I can see if its transmission line pressure or fuel pressure you are monitoring. It looks like transmission line pressure and if that is the case we need to monitor the fuel pressure.

Ask Your Own Ford Question
Customer reply replied 3 months ago
Key on engine off is 69.9 psi.
Ford Mechanic: Chris (aka- Moose), Technician replied 3 months ago

Thanks, ***** ***** were reading it as kpa and now psi, is that correct?

Ask Your Own Ford Question
Customer reply replied 3 months ago
It reads out as psi on the tuner. But when I pull up the graph numbers are in kpa.
Ford Mechanic: Chris (aka- Moose), Technician replied 3 months ago

Thanks, ***** ***** engine off there is no transmission line pressure since the engine is not running. So this reading has to be fuel pressure you are monitoring. Engine running fuel pressure should be 350-430 kPa (51-62 psi)

So first off there is something wrong with your reading because your pressure readings are to high. Excessive fuel pressure would be to blame on a faulty fuel pump driver module or fuel pressure sensor.

High fuel pressure though should not cause less power unless it is badly affecting the air fuel ratio.

My suggestion is to try a manual fuel pressure reading with a gauge inline to the injector rail to see if your electronic readings match. If so then I would replace the pressure sensor first off.

Now that I have posted a partial or complete answer, you will see you can rate me. The deposit you have already paid is not transferred to me until you rate me. I would like to receive nothing less than 5 star excellent ratings. So if we are not there yet, please reply and let me help more. If you're not pleased, let me know because rating bad does not result in a refund, there are better options. Rating now will not close this post nor prevent replying. Thanks Chris

Ask Your Own Ford Question
Customer reply replied 3 months ago
Ok. I've been suspecting the driver myself. I'm going to bed for the night but I will check further tomorrow and get back with you.
Ford Mechanic: Chris (aka- Moose), Technician replied 3 months ago

Super

Ask Your Own Ford Question
Customer reply replied 2 months ago
Where is the sensor located. On the 6.2 there is no fitting or sensor output. I am unable to find one from aftermarket parts source or dealer.
Ford Mechanic: Chris (aka- Moose), Technician replied 2 months ago

There is not a fuel pressure test port, you have to fabricate an inline T fitting where the fuel line connects to the fuel rail. The fuel pump driver module controls the fuel pressure.

Ask Your Own Ford Question
Customer reply replied 2 months ago
I understand there is no test port. Ford has a tool to adapt for a test gauge. What I'm asking is where is the pressure sensor that the ecm reads pressure from in order to control the driver unit.
Ford Mechanic: Chris (aka- Moose), Technician replied 2 months ago

This model shows to not have nor use a pressure sensor. The pressure is regulated by the fuel pump.

Ask Your Own Ford Question
Customer reply replied 2 months ago
Then what is sending signal to the ecm that shows line pressure?
And what purpose does the driver relay serve if there is nothing to control it?
Ford Mechanic: Chris (aka- Moose), Technician replied 2 months ago

I thought the same exact things. I assumed there was a pressure sensor on this year like prior years and other liter engines, though there is not. There is not one on the rail for the injectors nor on the fuel line to them. It simply states the pressure is controlled by the fuel pump. So that means the reading you have been monitoring as line pressure is for the transmission and not the fuel system.

Ask Your Own Ford Question
Customer reply replied 2 months ago
Ok. Then I don't know why it would show pressure with engine off.
That also means that this problem may have nothing to do with the fuel system.
Ford Mechanic: Chris (aka- Moose), Technician replied 2 months ago

Your weird readings may be coming from a conflict with your scan tool or programmer not correctly communicating with the PCM.

Ask Your Own Ford Question
Customer reply replied 2 months ago
Replaced fuel pump assembly today and still having same problem.
Ford Mechanic: Chris (aka- Moose), Technician replied 2 months ago

I am going to throw in the towel on this one. Opting out so another can try.

Ask Your Own Ford Question
Customer reply replied 2 months ago
OK. Thanks anyway.
It would seem that load suddenly drops and power is derated. I'm not sure how the load is calculated but could be an issue. I also notice that voltage seems to drop slightly near the rpm where derating happens but never drops below 13.5 volts. I did notice the led light bar was flickering a few nights ago while engine was running but hasn't since. Could a failing alternator cause an issue?
Ask Chris (aka- Moose) Your Own Question
Chris (aka- Moose)
Chris (aka- Moose)
Chris (aka- Moose), Technician
Category: Ford
Satisfied Customers: 49,440
49,440 Satisfied Customers
Experience: 16 years experience

Chris (aka- Moose) is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

AlvinC answered a question about my Ford truck that only someone with an in-depth knowledge of his subject would have known what was going on.

Rich DUSA

Because of your expertise, you armed me with enough ammunition to win the battle with the dealer. They are installing a fuel filter and fuel pump at no charge to me.

MollyUSA

I needed help with my car on Saturday morning....got a response in 5 minutes, and it was the perfect solution. Thanks again to your service.

Jason V.Kirkland, WA

I do know, after going though this with JustAnswer, that I can somewhat trust my mechanic but I will always contact you prior to going there.

BRNew Jersey

I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry.

Stephanie PElm City, NC

used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future.

David L.Richmond, TX

9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much.

PhilMarysville, CA

< Previous | Next >

Meet the Experts:

Ron

Ron

ASE Certified Technician

24,252 satisfied customers

23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs

Chris (aka- Moose)

Chris (aka- Moose)

Technician

49,440 satisfied customers

16 years experience

John Mc

John Mc

Ford Technician

5,495 satisfied customers

19 years Ford Lincoln Mercury experience

Chuck

Chuck

ASE Certified Technician

1,685 satisfied customers

33 Years Experience,Ford Senior Master,ASE Master,L1 Advanced Engine Performance

Cam

Cam

Journeyman Automotive Technician

10 satisfied customers

GM Grand Master Technician 2007. 14 years Automotive experience.

Richard

Richard

ASE Certified Technician

1,524 satisfied customers

12 years at a Ford Lincoln/Mercury and Jaguar dealer as a technician and shop foreman.

Mike V.

Mike V.

Auto Service Technician

1,365 satisfied customers

25 years experience on all makes and models, Licensed NYS Inspector.

< Previous | Next >

Related Ford Questions
Transmission seems to be stuck in neutra. Transmission will
Don't know. Tried changing fuses, disconnecting battery, checked fluid. … read more
roy
roy
Associate Degree
3 satisfied customers
The alternator was just replaced and now about 150 miles
The alternator was just replaced and now about 150 miles later while going down the interstate the rpms started climbing and now the transmission will not go into gear … read more
eauto
eauto
self employed
High School or GED
74 satisfied customers
I got powered to the alternator in big wire aND the yellow
I got powered to the alternator in big wire aND the yellow wire but she tg car is running nou power coming out of the gray wire… read more
Steve W
Steve W
Line Technician
Vocational, Technical or Trade Scho
1,968 satisfied customers
Battery drain! New Alternator, and battery... Car dies
Battery drain! New Alternator, and battery... Car dies randomly, or gages go crazy wanting to shut off but don't. Battery has drained a few times now but I have wires all over the place .attached to a… read more
Gabriel Grey
Gabriel Grey
Master Service Technician
Associates
279 satisfied customers
Put a new alternator on and it won't charge still. 95
Put a new alternator on and it won't charge still JA: What is the model/year of your Ford? Customer: 95 Mustang GT 5.0 JA: Are you fixing your Mustang GT yourself? What have you tried so far? Customer… read more
David Craig
David Craig
OWNER/MECHANIC
Associates
4,108 satisfied customers
Just replaced the alternator and battery in my 1999 Ford
Just replaced the alternator and battery in my 1999 Ford Windstar. The engine turns over, but never ignites. Any ideas? ' … read more
Mechanic01
Mechanic01
1,335 satisfied customers
I have a Motorcraft alternator I bought 18 years ago for
I have a Motorcraft alternator I bought 18 years ago for instillation on a Ford V-6 engine I have installed in an MG. I bought the alternator understanding it had an internal regulator. I had a man te… read more
Matt
Matt
Engineer
Bachelor\u0027s Degree
5 satisfied customers
I had the alternator wire to the battery melt at its
I had the alternator wire to the battery melt at its connection to the alternator I bought a new alternator but want to replace the wire also … read more
Gabriel Grey
Gabriel Grey
Master Service Technician
Associates
279 satisfied customers
Changed out alternator, replaced it with A KNOWN FUNCTIONG
changed out alternator, replaced it with A KNOWN FUNCTIONG alt and it now is only putting out 12.4 volts testing results says bad volt regulator. whats could be taking out volt regulators … read more
Ron
Ron
ASE Certified Technician
Vocational, Technical or Trade Scho
24,252 satisfied customers
Alternator died replaced it but still won't start with loud
Alternator died replaced it but still won't start with loud fast clicking when I turn the ignition … read more
eauto
eauto
self employed
High School or GED
74 satisfied customers
How do I reset the mileage counter and "change oil soon
How do I reset the mileage counter and "change oil soon light",back to 0 miles and unlit? How can I get a "diesel supplement " for my F350? Ford doesn't have it. What weight synthetic oil should be us… read more
Jaybird61
Jaybird61
Master Automotive Mechanic
2,095 satisfied customers
Won't charge. 2000 f-150 4.2L auto trans. New alternator.
New alternator. Tested continuity on fusible link. Checked all fuses (even ones not related to charging system. … read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
MY 1999 F250 7.3 When cranking engine my alternator charge
MY 1999 F250 7.3 When cranking engine my alternator charge for about 5 min. then stop. Replaced everything Batt, alternator, plug to alternator cant find problem … read more
Ron
Ron
ASE Certified Technician
Vocational, Technical or Trade Scho
24,252 satisfied customers
2004, f150, 5.4 engine two wheel drive. The transmission
2004, f150, 5.4 engine two wheel drive. The transmission slips at around 45 mph as if it shifted into neutral, when it slows down to around 20-25 mph the power returns. Just changed fluid and filter a… read more
HDGENE
HDGENE
Master Technician/Lead Technician
Associate Degree
2,835 satisfied customers
Not charging. Battery and alternator were both bad according
Not charging. Battery and alternator were both bad according to O'reilly. Before it stopped completely I would be driving down the road and lose power to the radio and instrument cluster for a second … read more
6Bucs
6Bucs
Senior Master Tech
Associate Degree
3 satisfied customers
My odometer is black no light to see the mileage. The
My odometer is black no light to see the mileage JA: Just to clarify, what are the exact lights you're talking about? Customer: The odometer is of reading its just black JA: What is the model/year of … read more
Dan
Dan
Dealership Technician
Associate Degree
1,724 satisfied customers
Will the engine and transmission. From an 08 focus SE fit in
Will the engine and transmission. From an 08 focus SE fit in an 04 SE focus … read more
Chris (aka- Moose)
Chris (aka- Moose)
Technician
49,440 satisfied customers
Just replace battery and alternator now engine idle low and
just replace battery and alternator now engine idle low and dying. … read more
eauto
eauto
self employed
High School or GED
74 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x