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Old 08-27-2014, 10:14 PM   #1
Junior Member
Join Date: Aug 2014
Posts: 1
Question Help diagnosing engine surge at idle

Hi all,

New member here. Having a strange issue with my '04 Jetta GLS (manual trans). Please note beforehand that I *have* taken her to my mechanic twice now, and both times they haven't been able to reproduce. Not sure if this is due to sheer (un)luck, laziness, or something else. However...

In the warmer months (60+ degrees it seems), once the car is warmed up, I get a strange surging/rough idle noise when in neutral or when travel in low speeds in traffic (5mph or so). It sort of comes in waves. You can hear it very loudly inside the car as a loud buzz/humming. Wheel shakes slightly, as does the stick. Tach bounces slightly. You really can't hear it outside of the car unless the hood is up. I tried my best to record this noise and have uploaded 3 clips to youtube with links below. I've dug around on the web and it seems some people say this could be:
  • engine mounts
  • alternator pulley
  • fuel injectors
  • gremlins

I haven't tried to connect a diagnostic readout machine, but since I've had this to the shop and they didn't find anything, I *assume* no error codes are being displayed. I am by no means a mechanical expert but I am comfortable digging under the hood when needed. I should note the alternator and related pieces were replaced a few years ago.

I apologize ahead of time for the vertical videos Also please don't judge me for all the X-Factor videos I've favorited on my youtube account...

Oh great VW brains, help me!
pghjetta82 is offline  
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