Question about 2002 Jeep Liberty

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Car clanks underneath when I step on accelarator going 30 mph car will also start to vibrate underneath engine transmission

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  • Jeep Master
  • 20,706 Answers

Get help this can be very dangerous
or at the least U-joints tad worn.

Posted on Dec 29, 2013

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Posted on Jan 02, 2017

wracefans24
  • 1985 Answers

SOURCE: Vibration while accelerating from 30 to 45 mph Jeep GrandCherokee

Not a tune up problem,
You need to have all U-joints checked out,They will give you the vibrations only while acceleration

Posted on Dec 04, 2009

Testimonial: "Perfect, Wasn't sure if it was the right solution but I got them fixed and problem stopped. Thanks."

  • 6982 Answers

SOURCE: jeep is leaking fluid from underneath, and oil

You may have a few separate issues. You need to determine the source of the fluid loss and exactly what kind of fluid it is that is leaking. From what you said, it may be the oil pressure sending unit, or that and something else. The clank shifting could be a bad universal joint on the driveshaft. Check those with the suspension unloaded or have someone watch from the side underneath to see if there is excessive movement in each joint as you move from reverse to drive.
Difficult to diagnose your problem on-line as seeing the problem is the key to fixing it. If you can't find it, have a professional do that for you....you still have the option of doing the work yourself!

Posted on Aug 30, 2010

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Tip

How to TEST A TORQUE CONVERTER ON A Automatic Transmission


Symptom : chattering or vibration while idling, and in Park.
Transmission sluggish upon Accelaration..

Step 1: chock Block all your wheels, and put your Auto emergency brake on (applied).

Step 2: You step on your gas pedal with engine in Drive, Full throttle. do not hold your regular brake pedal...Hold gas pedal down for 2 seconds your car will try to move. All wheels must not slip.

Step 3: watch your rpm gauge, your stall should be between 2400-2800 rpm depending on specification of manufacturer..
a low reading isbad stator assembly,
a high reading is a slipping one way clutch..

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Major transmission problem. That's what the flashing Check Engine light means.

If the Check Engine light is on all the time, it means there is a "fault code" stored in the computer. Take it to an auto parts store (like Auto Zone) and ask them to read the codes to see what it says. They should do it for free. If they won't, go to another auto parts store.

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Engine has been replaced. Never had a problem with the transmission before but engine vibrates while idling and shifting all gears. Took truck to 2nd shop and they removed the transmission from the motor...


I'd be inclined to say that you have a bad torque converter. Check to see if the transmission shop replaced it, bought a new one (probably around $40.00 depending on your location), or replaced it with a used one. I'd think that the second shop would have installed a new one since they were there anyway with removing the transmission. On the off chance...the torque converter just may not be in all the way and causing the vibration.

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I think my automatic transmission modulator valve is going out because it jerks and vibrates when i accelerate anything above 50 MPH.


90 % of the time jerking or vibration is usually caused by the engine and not the transmission. The most common cause is cylinder misfiries caused by the ignition system that cause the vehicle to ****, stumble, or shudder which make it appear and feel as though the transmission is the cause. Most transmission problems will cause harsh shifts, slippage, and/or delayed engagement but rarely jerks or vibrations. I'd start by looking at the spark plugs, plug wires, and coil packs to make sure they are all ok first before going any further. The reason most of these problems are more noticable over 50 mph is that the torque converter clutch is engaged at this point and it provides a solid connection between the engine and drivetrain which makes engine misfires more noticable. Good luck, hope this helps a bit!

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