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Shuddering?

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Old Jul 25, 2011 | 04:10 PM
  #1  
pb34's Avatar
pb34
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From: Vermont
Shuddering?

So I did some searching and read some interesting threads but most of them didn't apply to what I'm noticing.

Over the past few months I've noticed that my truck has a very intermittent shudder under mild acceleration. If I accelerated more during the shudder it seemed to disappear until I let off the peddle a little. When it happens the truck doesn't seem to be lacking power and the engine throws no codes. It happened again today right as I had stopped at a red light. I noticed that it was shuddering at idle too. I shut the truck off at the intersection and the shudder was gone once restarted. Any ideas what it may be?
 
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Old Aug 13, 2011 | 10:29 PM
  #2  
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mrjerryk
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Originally Posted by pb34
So I did some searching and read some interesting threads but most of them didn't apply to what I'm noticing.

Over the past few months I've noticed that my truck has a very intermittent shudder under mild acceleration. If I accelerated more during the shudder it seemed to disappear until I let off the peddle a little. When it happens the truck doesn't seem to be lacking power and the engine throws no codes. It happened again today right as I had stopped at a red light. I noticed that it was shuddering at idle too. I shut the truck off at the intersection and the shudder was gone once restarted. Any ideas what it may be?
I have the same problem in my '04 STX F150. When I am sitting at a light I can feel a slight shudder. I have asked 2 different mechanics. 1 of those mechanics was at the stealership. Both have told me it's normal for out V8s to do this. It's due to the cam that's in our motor.

I also have the same shudder when I accelerate. It feels like its in rear end of the truck. I've taken my truck in and had the rear diff checked twice now. Both times I was told the everything looks good. One of them even said it looks like the entire rear axle looks brand new inside.

If you find a solution or the cause of this problem please post back.
 
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Old Aug 13, 2011 | 10:39 PM
  #3  
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greg1971
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Originally Posted by mrjerryk
I have the same problem in my '04 STX F150. When I am sitting at a light I can feel a slight shudder. I have asked 2 different mechanics. 1 of those mechanics was at the stealership. Both have told me it's normal for out V8s to do this. It's due to the cam that's in our motor.

I also have the same shudder when I accelerate. It feels like its in rear end of the truck. I've taken my truck in and had the rear diff checked twice now. Both times I was told the everything looks good. One of them even said it looks like the entire rear axle looks brand new inside.

If you find a solution or the cause of this problem please post back.
Hello, I had a shudder with my 2004 FX4 and I used some ford brand friction modifier whic I added to the rear axle and it cleared it up in around 2 weeks. As far as the shudder at idle at a light I'm not sure but could be a lifter or cam like you said before. Good luck on your efforts.
 
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Old Sep 2, 2011 | 03:49 PM
  #4  
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If it is in the rear end and you have a positive traction rear end, the clutch's are dry and may need replacing. Most of the time it can be fixed with a change to a different rear end fluid. Good luck.
 
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Old Sep 2, 2011 | 06:16 PM
  #5  
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GHeTTo JOe
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From: 50450 IOWA
dont forget some friction modifier
 
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Old Sep 2, 2011 | 07:41 PM
  #6  
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danorules
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Joined: Jan 2010
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From: manchester,ct
i have not seen too many problems on the 150, but we had 3 work 550's that had a similar problem and it was the torque converter slipping. the description sounds the same as our problem but hopefully it is just needing friction modifier. that is less$ and an easier fix
 
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