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Lack of power when throttle is applied slowly if you floor…

Customer Question
lack of power when throttle...
lack of power when throttle is applied slowly if you floor it from dead stop it takes of an runs strong fuel pressure stays at 39 most the time
Submitted: 3 months ago.Category: Ford
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3/20/2018
Ford Mechanic: Dan, Technician replied 3 months ago
Dan
Dan, Technician
Category: Ford
Satisfied Customers: 25,969
Experience: Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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Hello, my name is ***** ***** I'm here to help get your problem solved.

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Ford Mechanic: Dan, Technician replied 3 months ago

What year, model, and engine size is vehicle? Thanks.

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Customer reply replied 3 months ago
lack of power under light acceleration fuel pressure stays around 39
Ford Mechanic: Dan, Technician replied 3 months ago

What year, model, and engine size is vehicle? Thanks.

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Customer reply replied 3 months ago
2008 f 150 5.4.
Customer reply replied 3 months ago
Ok I'm here
Ford Mechanic: Dan, Technician replied 3 months ago

Is the check engine light on? Has anything been replaced? Thanks.

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Customer reply replied 3 months ago
but u said u were unable to call
Ford Mechanic: Dan, Technician replied 3 months ago

We can continue here without a phone call. Is the check engine light on? Has anything been replaced? Thanks.

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Customer reply replied 3 months ago
No light. New pump an control module. New map an coils
Customer reply replied 3 months ago
Fuel pressure stays on 39 unless you floor it from dead stop then it goes up an down 39 to around 60
Ford Mechanic: Dan, Technician replied 3 months ago

Does it act like it has a rpm limiter such as not wanting to go above 3000 rpm?

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Customer reply replied 3 months ago
No it slowly builds rpm up
Customer reply replied 3 months ago
It does have a kn air filter.
Ford Mechanic: Dan, Technician replied 3 months ago

H​ave you tried to unplug mass airflow sensor to see if that helps?

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Customer reply replied 3 months ago
it will hardly run.
Customer reply replied 3 months ago
I know on older Ford's the run strong when u unplug them. Tps shows 19 percent at idle is thin normal
Ford Mechanic: Dan, Technician replied 3 months ago

D​oes it seem to run rough at all or just not have the power it should?

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Customer reply replied 3 months ago
Just lack of power. Except when your wide open from dead stop it pulls real hard.
Ford Mechanic: Dan, Technician replied 3 months ago

Clean the mass airflow sensor and let me know if that helps. THey have cleaner you can get from parts store which you spray onto sensor. I've seen many times where the oil from KN causes problems on the sensor. Let me know how it goes, thanks.

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Customer reply replied 3 months ago
Tred new one an one from other truck still the same. Can it be fuel rail sensor everyone tells me no.
Ford Mechanic: Dan, Technician replied 3 months ago

If that was problem your fuel pressure would be of and it would set a code, your pressure test was within specification. I'm going to open question back up to see if someone else has some ideas. Someone will reply automatically when they can help, thanks.

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Customer reply replied 3 months ago
Ok
Ford Mechanic: Daniel, ASE Certified Tech/business owner replied 3 months ago
Daniel
Daniel, ASE Certified Tech/business owner
Category: Ford
Satisfied Customers: 75
Experience: I have worked on a wide range of ford vehicles with 15 years ASE Certified experience. I am also a ford owner.
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Ford Mechanic: Daniel, ASE Certified Tech/business owner replied 3 months ago

Hi my name is ***** ***** I will be assisting you today. Please note that all experts are paid based off of ratings alone and I prefer five stars so please let me know what I can do to achieve that from you today.

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Ford Mechanic: Daniel, ASE Certified Tech/business owner replied 3 months ago

Just spoke with you on the phone... Check the running fuel pressure and get back to me as soon as you get a chance. Please don't forget to leave a rating for me so that we can keep this conversation going for any follow-up questions that you have. Thank you

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