Golf/GTI VI :: Odd Electrical Sound On Cold Start Only


Jan 25, 2011

Once the temperatures started to get into the 30's in the morning I noticed it. So a few months back but I just have been too lazy to dig deeper. It can best be described as an electrical, higher pitched, HUUMMmmmmm. It occurs every 1-3 seconds and lasts about 1 second when it is really cold but both those quicken once I start driving. It goes away within a minute or so of driving.

I am unable to locate the noise but it seems to be coming from the engine bay. It is different from the fuel pump clicking that others have noticed. To those that have VAGCOM it is somewhat similar to the noises from the engine bay when you do an autoscan... No CEL's or any other problems, I'm just concerned some electrical component is struggling.

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Golf IV / Jetta IV :: 2002 GTI - Loud Whistling Sound On Cold Start

I am having an issue with my 2002 GTI 1.8T. I have tried searching for an answer to this, and found a couple things saying maybe it could be the secondary air pump but wanted to get more opinions before I go shell out money to chase this problem.

When I start up the car in the morning after having it sit overnight, the car does the normal thing where it increases rpm's to about 1100 to warm it up. During this a loud "whistling" noise can be heard. Once the car is warmed up a little bit, the rpm's decline to about 900, and the whistling sound goes away. When this happens though it almost sounds as if a valve or something is closing causing the noise to go away.

Also, I am unsure if this is related to this, sometimes when I am driving, I will be accelerating and the car seems to stop accelerating as strong as it was, boost goes down from around 8 or 9 psi to about 4 and I seem to lose power as if I had let off the gas some. When I put my foot further down the car accelerates harder again and boost goes back up.

I have already changed spark plugs, cleaned MAF sensor, and run the 3m 3 part engine cleaning kit through it.

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To get straight to the point: I have a 2013 GTI that has recently started making a screeching noise on cold starts and during engine acceleration (not necessarily heavy load, but actual engine speed acceleration).

I recorded a video of it this morning and it is very easy to discern the sound. The car is APR stage 1 tuned and has a south bend clutch but I don't think either of those are related to the sound. The water pump has been replaced from the service bulletin, the auxiliary belt tensioner has been replaced because it started to make a noise (this noise is completely different). Otherwise the car has never given me an issue, it has been maintained exactly per the OEM repair schedule other then oil changes every 5k miles vs. 10k. I use mobil 1 0W-40 oil.

The video link: [URL] ....

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Battery is good and no problems with the truck. After the key is in and I give it anywhere from 15 to 60 seconds you can hear an electrical click real faintly and see the red security light come on and then the computer display comes on and then I can start with no problem? What could this be? My dealership has no clues and I can get it to act up because after I get it there it starts with no issue. The remotes work fine and this issue was why I got rid of my '05.

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The dealer can't figure out whats wrong, they need it to stop working completely. I am an engineer and have not been able to find any correlation (cold weather vs hot), not driving it for a while, turning off ac, lights, radio, using a different key. Also, during this time the battery has been periodically tested and has tested out fine.

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YouTube ......

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