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Has a terrible miss, OBD2 say miss fire on cylinder #8.

Customer Question
Changed the coils and plugs...
has a terrible miss, OBD2 say miss fire on cylinder #8. Changed the coils and plugs, installed phaser lock out kit, timing chains, crankshaft positioning sensor, camshaft positioning sensors and VCT solenoids
JA: Does the vehicle stall at low speeds? Does it sputter?
Customer: no stall at low speed, but shudders and shakes when pressing the accelerator.
JA: What is the model/year of your Ford?
Customer: 2010 F150 Platinum 5.4
JA: Are you fixing your F150 yourself? What have you tried so far?
Customer: Everything I put in the first sentence.
JA: Anything else you want the mechanic to know before I connect you?
Customer: I've ordered fuel injectors for it. After that I may try the fuel pump.
Submitted: 6 months ago.Category: Ford
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Answered in 4 minutes by:
5/31/2017
Ford Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 6 months ago
Chad Farhat
Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems
Category: Ford
Satisfied Customers: 4,247
Experience: Owner at Carolina Auto Service & Sales , 20 years experience in Foreign & Domestic Vehicles
Verified

Hi, I'm Chad. Welcome to JustAnswer. I'm reviewing your question and I will be posting your reply ASAP.

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Ford Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 6 months ago

Hey how are you

These engine have issue with oil flow thru the heads causing the vct malfunction , was oil changed and how did it look , did you pull valve cover and inspect inside of it for oil sludge ?

any fault showing if you scan it

Please let me know

Thank You

Chad Farhat

ASE Certified Technician

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Customer reply replied 6 months ago
Please read the first message I sent. Of course I had the valve covers off to change the VCT solenoids. The oil is clean and no sludge.
Customer reply replied 6 months ago
no phone calls
Ford Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 6 months ago

ok I got you ,

any faults ?

have you checked oil pressure at idle ?

any fault codes ?

what is the oil pressure at idle,below are your specs

I do not do phone call,so ignore the system sending you phone call request not me

2010 Ford Truck F 150 2WD V8-5.4L Flex Fuel

Save Article

Minimum oil pressure at idle (engine at normal operating temperature)172 kPa (25 psi) Oil Pressure at 2000 rpm (engine at normal operating temperature)275-517 kPa (40-75 psi)

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Customer reply replied 6 months ago
What does oil pressure have to do with a miss fire? According to the oil pressure gauge it is up past 3/4 at idle. The fault code is miss fire on cylinder #8. Changed that plug and coil twice.
Ford Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 6 months ago

You called me for help ,if you know it all ,you do not need me

you saying that what does the misfire has to do with the it , ( says it all ),

good luck to you sir

I choose to opt out of your question now and let another expert assist you on it

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Ford Mechanic: David Craig, Auto Mechanic replied 6 months ago
David Craig
David Craig, Auto Mechanic
Category: Ford
Satisfied Customers: 4,176
Experience: owner/mechanic at 3D Automotive
Verified

Hi Im David, is this the 5.4 triton 3v

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Ford Mechanic: David Craig, Auto Mechanic replied 6 months ago

Have you checked compression on #8? Have you checked for a broken spring?

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Ford Mechanic: David Craig, Auto Mechanic replied 6 months ago

http://gotaclassaction.com/ford-sued-over-latent-defects-in-vehicles-equipped-with-the-5-4l-engine/

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Customer reply replied 6 months ago
David, it only misses if I am a little aggressive on the pedal. If I ease down on the pedal(very slowly) while driving it does fine, but people honk at me for being so slow. Wouldn't a broken spring be a constant miss?
Ford Mechanic: David Craig, Auto Mechanic replied 6 months ago

that what I thought too. until I opened the valve cover. and ended up replacing the spring, all the rockers and even after that had to replace a slightly bent valve.

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Ford Mechanic: David Craig, Auto Mechanic replied 6 months ago

Ive had 3 of theses in my shop the past 2 years and was only able to fix 1

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Customer reply replied 6 months ago
I will check it out. Thanks
Ford Mechanic: David Craig, Auto Mechanic replied 6 months ago

you bet

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Ford Mechanic: David Craig, Auto Mechanic replied 6 months ago

just checking in to see how its going

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Ron
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