Throttle bucking - Ford Truck Enthusiasts Forums



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Throttle bucking

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Old 10-01-2013, 07:46 PM
cory5517 cory5517 is offline
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Throttle bucking

Just bought a 04 f150 5.4. When accelerating to go up a hill the truck will buck or shudder till you throttle through it. Any ideas?
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Old 10-01-2013, 07:47 PM
cory5517 cory5517 is offline
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Like the transmission doesn't know what gear it wants to be in
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Old 10-01-2013, 08:37 PM
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danorules danorules is offline
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Any codes ?
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Old 10-01-2013, 08:45 PM
cory5517 cory5517 is offline
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No engine light but that doesn't mean the previous owner didn't turn off the engine light. Will go see if there's any stored codes tomorrow
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Old 10-01-2013, 08:57 PM
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sounds like a miss fire to me . Ck for codes , pending codes , and mode 6 . Cyl cont. test would be helpful if you can . Look at fuel trims , long and short, if nothing else . That can lead you to the offending bank . Just a thought !
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Old 10-01-2013, 09:12 PM
cory5517 cory5517 is offline
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We'll after doing some researching the ticking I'm getting after engine warms up could be cam phasers. What and where are the cam phasers lol?
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Old 10-03-2013, 10:48 PM
ThirstyFX4 ThirstyFX4 is offline
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Sounds like a misfire. It's probably time to replace the sparkplugs.
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Old 10-04-2013, 06:40 AM
cory5517 cory5517 is offline
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Went and had codes read and came up with a 2&3 misfire but was told it needed a valve job. Taking it in to have valves done then gonna get plug and coil pack tuneup
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Old 10-04-2013, 07:18 AM
ThirstyFX4 ThirstyFX4 is offline
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Good luck with that.
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Old 10-04-2013, 07:36 AM
cory5517 cory5517 is offline
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Truck has warranty thank god
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Old 10-04-2013, 09:45 AM
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If none of the above posted solves it, it might also be a bad TPS throttle position sensor.
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Old 10-04-2013, 09:49 AM
cory5517 cory5517 is offline
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Can't you test a tps by using the cruise control?
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Old 10-04-2013, 10:43 PM
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Quote:
Originally Posted by cory5517 View Post
Went and had codes read and came up with a 2&3 misfire but was told it needed a valve job. Taking it in to have valves done then gonna get plug and coil pack tuneup
That makes no sense ! Smells fishy to me !
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Old 10-05-2013, 08:08 AM
cory5517 cory5517 is offline
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The valve job part?
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Old 10-05-2013, 08:09 AM
cory5517 cory5517 is offline
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I think it needs a coil and plug tuneup and cam phasers
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