Vibrates with acceleration

2005 JEEP LIBERTY
154,000 MILES • 3.7L • 3 CYL • 4WD • AUTOMATIC
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ERICA MCLEOD
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  • 2 POSTS
I have replaced my belt and water pump recently which I believed was the problem initially. It stopped shaking. Now it is shaking again when I press on the gas but, not if I take my foot of the pedal. After driving it for two days. What could the problem?
Sep 28, 2018 at 12:05 PM
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JACOBANDNICKOLAS
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Hi Erica and thanks for using 2CarPros.com.

If it is shaking when you accelerate, it sounds like a possible misfire. Is the check engine light on? If it is, you need to have the computer scanned to determine if it is a misfire or something different. Here is a link that discusses vibrations on acceleration. See if it provides any insight for you.

https://www.2carpros.com/articles/vibration-noise

Here is a link that discusses misfires:

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

Let me know if the check engine light is on.

Take care,
Joe
Sep 28, 2018 at 9:54 PM
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ERICA MCLEOD
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Hi Joe thanks for the reply, there are no lights on. Initially I discovered the water pump was loose and needed to be replaced and thought that was the cause of the vibration. Replaced that along with the serpentine belt. The vibration went away for a day or two but has returned but only when I accelerate. Otherwise it does not do it at all if I release the gas or when applying the brake. Also I can coast and no vibration.
Sep 29, 2018 at 6:54 AM
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JACOBANDNICKOLAS
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Okay, since it only happens when you accelerate, I wonder if it has something to do with a universal joint (u-joint). Have you checked them? Here is a link that shows how it's done.
I don't know if you need it, but here is a link that shows how to check one. Check this and let me know what you find.

https://www.2carpros.com/articles/how-u-joints-work

Since the check engine light isn't coming on, Erica, then it most likely isn't a misfire either. I think we need to focus on the drive line. One other thought, make sure there isn't a worn motor or transmission mount.

Here is a general link that looks at many different reasons for vibrations. Page down until you reach the section on belt tensioners. You know, if the tensioner is bad, you may be feeling it only at high RPM's. SInce it stopped for a couple days after you did the work, I'm starting to question the tensioner, a belt driven accessory...

https://www.2carpros.com/articles/vibration-noise

Let me know what you find. I'm interested in knowing.

Take care,
Joe
Sep 29, 2018 at 5:44 PM