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Random squeal and vibrations

  #1  
Old 07-09-2019, 08:37 AM
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Location: Carbondale, IL
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Default Random squeal and vibrations

Hi everyone,

few days back something strange started happening with my 2002 V70 - something that could be described as "oscillating vibrations". Couldnīt really determine the source, but it feels like itīs coming from the engine bay. This noise/vibrations seem to be constant, regardless of the rpm.

Little later – perhaps a day or two – an awful squeal occured. Iīm pretty sure it sounds like a belt squeal. This, however, is not constant, it comes and goes. For instance on my 15 min drive from work I started without a squeal, halfway through the noise started, and when I got home it was gone again. I havenīt been able to determine any pattern for when it occurs and when it disappears. Except that WHEN itīs happening, it squeals above 1500 rpms.

Additionally, the check engine light came on at that time as well. I have a basic OBDII code reader, but when I plug it in it doesnīt find any error codes (Iīve used it in the past without any issues, so I know it works).

I replaced the serpentine belt and the tensioner pulley about 2k miles back, the timing belt was done about 35k miles back.

Iīd be happy about any ideas or input about those issues.

Thanks in advance.
 
  #2  
Old 07-10-2019, 02:45 AM
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little change to the previous post - the oscillating vibration noise goes up in both frequency and volume with the rpms. It is always present, unlike the squealing noise which comes and goes randomly.
It really doesnīt sound healthy.
 
  #3  
Old 07-11-2019, 03:36 AM
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Update nr.2

I looked under the hood yesterday, took the timing belt cover off and listened to everything that was going on there for a bit. It sounded like the vibrations are coming from the alternator, the squealing from the timing belt / camshaft pulley. Took off the serpentine belt off, started it, and voila, both noises were gone. Which was kinda surprising, since I could have sworn the squealing comes from the timing belt. I swapped out the serpentine belt tensioner pulley some 2k miles back, so I was pretty sure it was alright. Checked all the other pulleys and the alternator one had a pretty good wobble and was loose to turn in both directions (which it shouldnīt as far as I know).
Little later my buddy came by with a professional OBD reader and pulled the code that my reader didnīt display - something about camshaft synchronization being off. Another surprise - I always assumed that if the camshaft was off, you would feel knocking or shaking or simply could tell that the car isnīt running as it should.
Anyways, Iīm gonna try pull an alternator from a scrap yard (or buy a new one if nothing is available) before the weekend, switch them out and see if it made a difference. Fingers crossed it will.

Iīll post an update when itīs done, whether it was really the alternator pulley going bad.
 
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