bucking - Ford Powerstroke Diesel Forum

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post #1 of 15 Old 01-25-2010, 04:24 PM Thread Starter
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bucking

Can someone tell me why my trucks bucks when i first drive it in the morning. It only does it when i get to 45-50mph in overdrive. I hit the brake to kick it out of overdrive and it stops. When the trucks warms up, no problem.

It has always done this, bought the truck new. Dealer says not a problem.

2007 F250 CC FX4, MBRP 4inch turboback w/cat delete, Dashdaq
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post #2 of 15 Old 01-25-2010, 04:26 PM Thread Starter
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should have said also the truck has no codes and was flashed back in the summer. thanks

2007 F250 CC FX4, MBRP 4inch turboback w/cat delete, Dashdaq
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post #3 of 15 Old 01-26-2010, 05:40 AM Thread Starter
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Come on guys, somebody has to know, maybe one of the techs could chime in. heres a anyway. thanks

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post #4 of 15 Old 01-26-2010, 05:44 AM
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The bucking your talking about is it like a shift flare ? only when cold ?

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post #5 of 15 Old 01-26-2010, 05:54 AM
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im interested also,i just had my egr and oil cooler replaced and ever since i got my truck back when cold it has like a miss or a bucking feeling until warm,what the heck is this,i actually brought it back to the dealer and it didnt do it because truck was warm,anybody.

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post #6 of 15 Old 01-26-2010, 06:10 AM
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Originally Posted by imstokin View Post
im interested also,i just had my egr and oil cooler replaced and ever since i got my truck back when cold it has like a miss or a bucking feeling until warm,what the heck is this,i actually brought it back to the dealer and it didnt do it because truck was warm,anybody.
As for that sounds like an injector spool valve sticking. Thats why you get that miss and some bucking when cold.

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post #7 of 15 Old 01-26-2010, 09:13 AM Thread Starter
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The transmission shifts fine and smoothly. The trucks runs fine when first start it. Has done this since new. Only does it when its cold and when it goes into overdrive 45-50 mph. Once warm, everything ok.

Is this something to do with the torque converter or trans being cold? Engine doesn't miss.

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post #8 of 15 Old 01-26-2010, 11:44 AM
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I agree on the injector issue. Try some Hot Shots secret or some Rev-X. Many, including Me, have had success with this "treatment" for the stiction issue that You are experiencing.

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post #9 of 15 Old 01-30-2010, 06:33 AM Thread Starter
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Originally Posted by 5OH6.0 View Post
I agree on the injector issue. Try some Hot Shots secret or some Rev-X. Many, including Me, have had success with this "treatment" for the stiction issue that You are experiencing.
The trucks doesnt buck betwwen the speeds of 0-45. The truck runs like a champ. But once it goes into overdrive and the truck is cold is when it starts bucking, bouncing, like a tire out of balance fell. When the truck get warm, usually about 15min., no problems until the next morning. Who knows. Cold natured truck i suppose.

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post #10 of 15 Old 01-30-2010, 06:56 AM
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I would agree with the injector issue. I just went though two rounds of injector problems. When I would drive on the highway it felt like a tire was out of balance, but I chalked it up to the road being rough. Then the injector went. Second time I felt the same thing, the injector went. Before it goes completely, I would throw some Diesel Kleen, change to synthetic oil, and add Hot Shots Secret. This may prevent the injector from going.
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