AUDI Engine Compartment Droning Noise

Audi Tech Tip: Droning Noise From Engine Compartment

Models:

2015 – 2016 S3 and TTS

Condition:

A customer may complain of an engine droning noise or rattle noise when the engine speed is approximately 3,500 to 4,000 rpm (vehicle speed does not affect the noise, and the vehicle can be stationary).

The source of the noise seems to be from somewhere near the windshield or inside the dash panel area. The noise is more noticeable when the Audi drive select is set to dynamic mode. No DTCs are stored.

Technical Background:

In S3 and TTS vehicles, there is an electronic sound amplification system (actuator for impact sound) that changes depending on the selected Audi drive mode. The harness for the sound actuator can make contact with the vehicle body structure and the noise can be amplified by the sound actuator. This noise is only noticeable at higher speeds due to the calibration of the sound actuator system.

A video of the condition is located at https://audi-external.kzoplatform.com:443/swf/player/316 or scan the QR code in Figure 1.

Figure 1: The QR code for viewing the video with a QR code reader on phones and tablets. Alternatively, the video can be accessed through internet browsers at the link provided in this bulletin.

Solution:

The harness for the sound actuator is covered with insulation tape.

Repair Procedure:

1. Verify the concern by checking for the sound with the engine speed between 3,500 and 4,000 rpm. Make sure the engine has reached operating temperature. This can be performed while the vehicle is stationary. 

2. Check for the sound with the Audi drive select in comfort mode (see Figure 2).

Figure 2: Audi drive select mode selection.

3. Verify that the sound is more noticeable in dynamic mode. 

4. If the sound is more noticeable in dynamic mode, then the source is the harness contacting the body structure and proceed to step 5. If not, further diagnosis might be necessary.  

5. Loosen the connector R214 on the sound actuator (see Figure 3).

Figure 3: Sound actuator R214 in the plenum chamber.

6. Wrap fleece tape from approximately 2cm away from the connector housing to the exit of the main wiring house (see Figure 4). The new tape can be placed over the existing insulation. The added bulk will dampen vibrations.

Figure 4: The direction in which to start wrapping the tape (arrow).

7. Check for the sound again to verify that the concern is resolved.

You May Also Like

Timing BMW VANOS N53 And N54 

To service them, you will need the appropriate toolset to lock the crank and camshaft.

The BMW N53 (naturally aspired) and N54 (turbocharged) engines were among the first BMW engines to come with variable valve timing on the intake and exhaust camshafts. The N53 and N54 straight-six have unfairly earned a bad reputation for reliability with technicians due to timing chain and variable valve timing problems. The reputation comes from owners not keeping up with oil changes and it is difficult to check engine timing.

Motor Mount Technology and Failures

Engines have noticeably changed in the past decade. Fewer cylinders, more power at lower RPM and more detectable vibration at idle are just a few of the differences in today’s engines. Related Articles – VW/Audi PCV Service – BMW Timing Chain Stretch Issues – Volvo AWD With Active On Demand Coupling With these changes, it

VW/Audi PCV Service

The PCV valve regulates the flow of gases from the crankcase.

BMW Timing Chain Stretch Issues

Over the past decade, BMW and many other import automakers have had issues with timing chain stretch. When most BMW owners hear the phrase “timing chain stretch,” they assume that the gears on the crankshaft and camshaft sprockets have pulled on the chain, causing the links to lengthen like a rubber band. It is not

Volvo AWD With Active On Demand Coupling

There are a lot of Volvos on the road, and the same-year vehicles all share the same AWD systems.

Volvo xc70 AWD
Other Posts
VW E-Golf Service Potential

Only about 20,000 E-Golfs are on the roads, but the car is an example of EV service opportunities available to shops.

Don’t Miss The July Digital Edition of ShopOwner

The July issue includes technical and management content and is free to download.

Now Available – June’s Digital Edition of ShopOwner

The June issue includes technical and management content and is free to download.

Don’t Miss The May Digital Edition of ShopOwner

The May issue includes technical and management content and is free to download.