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06 F150 5.4 V8 bucking/jerking when accelerating uphill


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Stevethomaspta
New User

Jul 19, 2017, 12:15 PM

Post #1 of 6 (610 views)
06 F150 5.4 V8 bucking/jerking when accelerating uphill Sign In

I have an 06 F150 that bucks/jerks when accelerating uphill or when under a load. If I punch the gas it stops, but if I maintain speed it does it until it shifts to next gear. It has never thrown a code. I have changed plugs and coils. Any suggestions???


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jul 19, 2017, 12:39 PM

Post #2 of 6 (607 views)
Re: 06 F150 5.4 V8 bucking/jerking when accelerating uphill Sign In

Did you change the plugs and coils before or after the problem started?

Did you change all 8 coils?



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Stevethomaspta
New User

Jul 19, 2017, 12:58 PM

Post #3 of 6 (603 views)
Re: 06 F150 5.4 V8 bucking/jerking when accelerating uphill Sign In

Changed them after the problem started. Yes changed all plugs and coils


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jul 19, 2017, 1:02 PM

Post #4 of 6 (601 views)
Re: 06 F150 5.4 V8 bucking/jerking when accelerating uphill Sign In

Process of elimination tends to point to injectors clogged up.

If you find a competent shop then can do an injector balance test.

Don't waste your money with any "Mechanic in a Can". Nothing added to the fuel will correct anything.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Stevethomaspta
New User

Jul 19, 2017, 1:08 PM

Post #5 of 6 (597 views)
Re: 06 F150 5.4 V8 bucking/jerking when accelerating uphill Sign In

Would it sputter or miss if it were the injectors? This is a hard jerk, but doesn't lose any power.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jul 19, 2017, 1:11 PM

Post #6 of 6 (595 views)
Re: 06 F150 5.4 V8 bucking/jerking when accelerating uphill Sign In

Yes, if the cylinder was too lean, you would get a lean misfire under load.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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