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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW MKIV-A4 TDIs (VE and PD)

VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old January 26th, 2006, 09:25   #1
skgwilliams
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Default Can bad serpentine belt cause engine vibration?

Hi everyone,

If I am in the wrong forum, I apologize. I'm a relative newbie so I wasn't sure if I have an A4, but I thought do so I figured this was a better place to post than 101.

My car is a 2001 Jetta TDI. Automatic with 109,000 miles.

Here's the situation. Since Monday of this week, my car has sounded much louder at idle when in drive. I popped the hood with the engine running and in park and looked around. The noise & vibration level don't change based on engine temp or driving speed.

The whole engine is vibrating more than I recall it doing before. And is much louder. Not deafeningly louder, but more noise than normal. It basicall sounds like it usually does but with the volume turned up.

With the engine off I looked at the serpentine belt because to my untrained ear that is where it sounds like the elevated noise could be coming from.

The serp belt is textured on the back. Now keep in mind I didn't remove the belt, but the left side is smooth on the back and the right side is textured on the back. If I had my camera with me I'd take a picture to show.

It that an unusual wear pattern? Is this probably unrelated to the increase in noise.

Background: Intake was cleaned and timing belt changed about 10,000 miles ago. Fuel filter changed too.

I hadn't filledup with new fuel. This is the same fuel I was running prior to the noise increase.

Any ideas would be appreciated to help troubleshoot, if this is in fact a sign of trouble.

Thanks for reading my post ,

skg
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Old January 26th, 2006, 09:31   #2
dieseldorf
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do you know if a qualified individual changed the TB? I hope you are not on the verge of catastrohpy, skg.
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Old January 26th, 2006, 09:48   #3
skgwilliams
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Quote:
Originally Posted by dieseldorf
do you know if a qualified individual changed the TB? I hope you are not on the verge of catastrohpy, skg.
Is that what you think this is? Timing Belt problems?

It was a reputable shop, with limited TDI experience. They service mainly high-end foreign cars. Mine isn't the only TDI they've worked on, but they've only serviced a few.

Last edited by skgwilliams; January 26th, 2006 at 09:52.
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Old January 26th, 2006, 16:42   #4
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Could be a bad tensioner for the serp belt or the roller. Oil leaking from the tensioner? Is it excessivly hot after driving? The wear pattern is normal, I see it a lot.
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Old January 26th, 2006, 18:09   #5
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engine vibration? maybe motor mount?
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Old January 27th, 2006, 04:43   #6
skgwilliams
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Quote:
Originally Posted by BobnOH
engine vibration? maybe motor mount?
After all I read about motor mounts failing, I was thinking that could be the problem. Are the mounts visable from the top side or do I have to get the car up on ramps or a lift for a good view?

I'll find a way to check that.

I owned a Saturn prior to this car and with much lower milage on the car one of the engine mounts cracked and had to be replaced.

Thanks.

-skg
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Old January 27th, 2006, 05:30   #7
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These mounts just don't fail. The bolts do.
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Old January 27th, 2006, 06:07   #8
skgwilliams
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Quote:
Originally Posted by jasonTDI
These mounts just don't fail. The bolts do.
Thanks Jason. I'll find a way to check that. And thank you for the advice on the serpentine belt wear pattern.

I'll be sure to check for the things you mentioned, heat, oil leakage.

-skg
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Old January 27th, 2006, 06:29   #9
dieseldorf
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Quote:
Originally Posted by skgwilliams
They service mainly high-end foreign cars.

S, that becomes somewhat irrelevant as many others have had the mis-fortune of discovering. When it comes to the timing belt changeout, many are beffuddled.

You may want to have Chris Hill in Braintree take a quik look - - it the bolts break, you have a big repair ahead!
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Old May 20th, 2006, 01:31   #10
Altern8
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did you fix this ?
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Old October 26th, 2008, 16:32   #11
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Well 2+ years and 40,000 miles later I remembered posting this thread. I thought I'd come back and update.

Nothing catastrophic happened. I kind of got used to the vibration. I knowin retrospect I probably should have had it looked at but I didn't.

When I started this thread 2 years ago I had just had a 40k timing belt and related parts installed at the time of the change.

2 years later it was time for the belt change again and I just had it done again last week but this time by mrchill. Got the 100k kit this time During the change he recommended replacing one of the engine mounts that looked questionable.

Well that engine mount replacement has made a noticeable difference in the feel of my car. It no longer vibrates the same way it did before when stopped in drive.

This is a great community and I wanted to contribute by adding a conclusion to my thread, even it if is 2 years later.
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Old October 27th, 2008, 04:20   #12
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Thanks for the update.
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Old October 27th, 2008, 07:42   #13
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Update much appreciated...the questions don't help much but the answers are invaluable. Good job getting mrchill to do the TB this time...
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