Vibrates between 35 and 56 MPH?

Tiny
MATTLON910
  • MEMBER
  • 2004 JEEP LIBERTY
  • 3.7L
  • V6
  • 4WD
  • AUTOMATIC
  • 112,000 MILES
The vehicle listed above drives good until it reaches between 35 MPH and 45 MPH then it starts to vibrate or what some people call a shudder. Feels like those little highway markers that's in the road that alert you when you cross the line. But when I continue to accelerate over 45 and above the vibration stops! There's no check engine light the fluid and the filter has been changed nevertheless it's still does it between those miles per hour. I did notice that it has a PO700 and a p0740 code that is stored and at times I delete it, but it comes back.
Sunday, July 9th, 2023 AT 2:12 PM

4 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Can you tell if the engine is misfiring, or does it feel like a tire has a bubble in the tread which is what the problem sounds like to me. Here is a guide to help you lift the front and then the rear of the car so you can spin the tires and observe the tread pattern to identify any defects in the tread.

https://www.2carpros.com/articles/jack-up-and-lift-your-car-safely

Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.
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Monday, July 10th, 2023 AT 11:37 AM
Tiny
MATTLON910
  • MEMBER
  • 3 POSTS
First thank you for the quick response! It's raining today but I will check the tires, and there's no misfire and will check the tires for bubbles. PS another friend of mine has a OBD 2 gauge and everything checked out fine except the po740 code which stated TCC out of range.
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Monday, July 10th, 2023 AT 12:25 PM
Tiny
MATTLON910
  • MEMBER
  • 3 POSTS
I've checked for bubbles on each tire, and they seem to be fine. There are no warps on the tires. I needed to say I checked that po740 code and it said TCC out of range but still no check engine light. I am so baffled.
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Tuesday, July 11th, 2023 AT 3:23 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Does it seem like the problem is coming from the transmission of an engine misfire? Can you please shoot a quick video with your phone so I can hear the noise? That way I can tell for sure what's going on. You can upload it here with your response.

P0700 - Transmission Control System Malfunction:

P0740 - Torque Converter Clutch Circuit Malfunction:

If the torque converter is having a problem, it will make the car vibrate.
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Tuesday, July 11th, 2023 AT 11:10 AM

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