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Tiny
JOHN VONHOF
  • MEMBER
  • 1998 FORD F-150
  • 4.6L
  • V8
  • 4WD
  • AUTOMATIC
  • 268,000 MILES
I have shutter that happens around twenty five to thirty mph. When this shutter is taking place it feels like being pushed from the left or right and it seems I might even loose control spin out. What is happening? Something locking up?
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Sunday, February 19th, 2017 AT 8:34 PM

8 Replies

Tiny
CARADIODOC
  • EXPERT
How long does this occur each time? If it is for just one or two seconds, lightly tap the brake pedal while holding the accelerator pedal steady. If the shudder stops, then occurs again a couple of seconds later, that is the torque converter locking up. The most common cause of that is the transmission has the wrong type of fluid in it or an additive has become depleted. The lock-up clutch is grabbing too aggressively. It should be allowed to slip a little, and engage gradually.

This torque converter shudder can last much longer too, but the clue will still be it stops when the brake pedal is pressed. Also, this is not felt in the steering wheel.

If the steering wheel is vibrating, it is more likely a part is loose or worn in the steering or suspension systems. Have it inspected at a tire and alignment shop. The people there are experts at finding the causes of noises, vibrations, and bad tire wear.

A worn universal joint can shake the entire truck. That vibration will be about six times faster than wheel speed. You may also hear a loud metallic clink when shifting between "reverse" and "drive".
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Sunday, February 19th, 2017 AT 8:50 PM
Tiny
JOHN VONHOF
  • MEMBER
Your right! Amazing first time I have experienced this thank you for your help. Can it be fixed by changing fluids?
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Sunday, February 19th, 2017 AT 9:02 PM
Tiny
CARADIODOC
  • EXPERT
Yes, if your transmission specifies a particular fluid. This problem occurs most commonly when the transmission is serviced, as in a maintenance fluid and filter change, and the wrong fluid is put in.
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Sunday, February 19th, 2017 AT 9:05 PM
Tiny
CARADIODOC
  • EXPERT
I forgot to include some of the other clues. The first one is the speed you observed. Twenty five mph is a little low, but possible. Lock-up typically occurs beginning around thirty five mph, and only when the engine is warmed up. On a cold winter day, I have to drive about four miles before it locks up. At higher speeds, like fifty five mph, there is no shudder, but I can feel the engine slow down, and the tachometer drops 200 rpm. On a hot summer day, it is already locking up within the first mile. I get that shudder too but it is real bad when I cruise at a steady forty mph. Does not occur at any other speed. Mine is a 1994 Grand Voyager, and I know from the previous owner, they changed the filter and put the wrong fluid in. This is a real common annoyance with an easy fix.
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Sunday, February 19th, 2017 AT 9:13 PM
Tiny
JOHN VONHOF
  • MEMBER
I just bought this truck the previous owners were not upfront about anything the ad said runs great lots of heat AC works, but no heat at idle idles rough checked for vacuum leaks have not found one yet. Changed idle air control cleaned MAF I get no codes, but think I found problem EGR is not working. As for no heat I was looking tonight and found who ever put serpentine belt on did not even put it around the water pump but electric fans been working over time.
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Sunday, February 19th, 2017 AT 9:42 PM
Tiny
CARADIODOC
  • EXPERT
Sounds like it was attacked by an incompetent do-it-yourselfer. That is what happens when you do not come to 2CarPros first!
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Sunday, February 19th, 2017 AT 10:14 PM
Tiny
JOHN VONHOF
  • MEMBER
I may still have a torque converter issue, but I am not so sure that what I described to you could the rear end be causing what I am feeling? I do feel vibrations in the steering wheel but the truck has knobby tires maybe be even out of balance. Haven not check to make sure all tires are same size I think the carrier bearings going out too. The truck just feels like it sways I do not even drive it over thirty five mph. Unfortunately my other Ford the linkage is messed up so I cannot get reverse or low gear and when I did drive it transmission went into neutral mode engine would just rev up had to slow down or shift to low. It is too cold and too much snow to work on it until spring guess. I will have to break down and have a shop check it out.
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Sunday, February 19th, 2017 AT 11:15 PM
Tiny
CARADIODOC
  • EXPERT
I am in the middle of Wisconsin, and I really hate cold and snow!
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Monday, February 20th, 2017 AT 6:23 PM

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