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Moaning/Groaning noise from front drivetrain

 
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Old 18 Apr 2016, 09:25 pm
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Default Moaning/Groaning noise from front drivetrain

So I just replaced the timing belt, water pump & torque mounts on my girlfriend's 2006 PT. I never drive this vehicle and when I was road testing it after completing the repairs, I noticed a groaning/moaning sound coming from the front end while the vehicle is moving. I ask my girlfriend about it, and she said that it has slowly been getting louder over the last year. The noise gets louder and changes pitch the faster the vehicle goes. At highway speeds it is quite loud. I also noticed that it gets quieter while turning right (like a highway that banks to the right).

My first thought is that it sounds like its in either the front axle-shafts or (hopefully not) the transaxle. Has anyone experienced this before and have a good idea of what the problem is? I know that the axles aren't too expensive, but I would prefer not to replace them if it most likely isn't going to fix the problem.
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Old 18 Apr 2016, 10:04 pm
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Default Re: Moaning/Groaning noise from front drivetrain

Usually a bad axle will either start clicking on turns or shaking at various speeds. This sounds to me like maybe it's the power steering pump. Perhaps change the power steering fluid and see what happens. BUT, as I've stated before, I'm NOT a mechanic and don't profess to be. Any way you could post a sound clip?
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Old 18 Apr 2016, 10:26 pm
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Default Re: Moaning/Groaning noise from front drivetrain

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Originally Posted by chuzz View Post
Usually a bad axle will either start clicking on turns or shaking at various speeds. This sounds to me like maybe it's the power steering pump. Perhaps change the power steering fluid and see what happens. BUT, as I've stated before, I'm NOT a mechanic and don't profess to be. Any way you could post a sound clip?
I don't think that its the P/S pump. The sound isn't there when the vehicle isn't moving (at idle or when raising the RPM of the engine in park). The sound is definitely directly related to the speed of the vehicle. It is there while coasting to a stop (it gradually gets quieter as the vehicle slows down). I haven't tried putting the transmission into neutral while coasting to see how this affects it. I'll try that tomorrow, and I will also try and get a video/sound clip to post.

Full disclosure: I AM an ASE certified mechanic and have been working on cars professionally for 15 years. I am an engine performance/electrical systems specialist, though. I am ASE certified in A1, A6, A8 & L1. I don't normally work on suspension, transmission or axle systems at my shop. I figured that it was worth a shot to ask here first, in case there was a known common problem that causes this issue.
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Old 18 Apr 2016, 11:11 pm
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Default Re: Moaning/Groaning noise from front drivetrain

Wheel bearing?

Full dis.: I don't know poop.
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Old 18 Apr 2016, 11:20 pm
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Default Re: Moaning/Groaning noise from front drivetrain

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Originally Posted by PTloser32805 View Post
Wheel bearing?

Full dis.: I don't know poop.
That is actually a great suggestion. Now that I think about it, it could be the wheel bearings AND they are easy to check. Thanks!
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Old 18 Apr 2016, 11:35 pm
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Default Re: Moaning/Groaning noise from front drivetrain

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Originally Posted by PTloser32805 View Post
Wheel bearing?

Full dis.: I don't know poop.
I've stepped in it enough to "know poop".

The roaring does sound like a wheel bearing.
Turning right/left might simply change the loading and noise.
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Old 19 Apr 2016, 12:17 am
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Default Re: Moaning/Groaning noise from front drivetrain

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Originally Posted by VOS View Post
I've stepped in it enough to "know poop".

The roaring does sound like a wheel bearing.
Turning right/left might simply change the loading and noise.
Exactly. I knew it had to be something in that area, but I somehow overlooked the wheel bearing. I'll be checking both bearing tomorrow and I'll report back on what I find.
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Old 21 Apr 2016, 08:31 pm
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Default Re: Moaning/Groaning noise from front drivetrain

The noise your talking about is wheel bearing when you turn right you load the left side, so most likely it's your left wheel bearing. I would replace both if possible. Always better to do both one might be worse than the other one,so you can't hear it over 4he fealty bad one.
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