Welcome to the Cadillac V-Series Forums!
  • Win a 2018 CTS-V Championship Edition from Dream Giveaway!

    Complete Details: Win a 2018 CTS-V Championship Edition from Dream Giveaway!
  • I know that lately, we've gained a lot of new members which is awesome and a lot of those new members are coming from other forums that may use vBulletin and their Private Message (PM) system. Here, we use the XenForo forum software which is (IMHO) much better than vBulletin. The "Conversation" system here is the same as the PM system on vBulletin. So if you want to PM another member, just click their username in a post, and click on "Start Conversation". To see all of your PMs, click on your profile and go to Inbox. Hope this helps.

2014 - 2016 Cadillac CTS-Vsport: Twin Turbocharged V6 Engine Sounds

Rob

Administrator
Staff member
Joined
Nov 3, 2011
Messages
3,025
Location
New Hampshire
V-Series Cadillac(s)?
Not Yet!
Source: GM TechLink
January 29, 2016


Twin Turbocharged V6 Engine Sounds

A noise condition may be heard on some 2014-2016 Cadillac models equipped with the twin turbocharged V6 engine (RPO LF3, LF4).

Cold Start Rattle Sound at Idle


On some 2014-2016 CTS-V Sport and XTS models equipped with the twin turbocharged 3.6L V6 engine (RPO LF3), a rattle sound may be heard coming from the turbocharger when the engine is cold. This is a cold start noise at idle.

Click below to listen to an example of the rattle sound. (Fig. 15)


Fig 15

TIP: Do not confuse this noise with a similar noise heard when revving the engine.

If the rattle sound when cold is from the turbocharger, and the noise is unforced, there is a new turbocharger assembly available with a revised spring for the wastegate to limit movement when cold.

The new part numbers are 12666538 (turbocharger assembly – LH) and 12666539 (turbocharger assembly – RH) for the CTS-V Sport and 12666540 (turbocharger assembly – RH/LH) for the XTS. If the vehicle already has these part numbers installed, do not replace the part again.

Rattle Sound when Revving the Engine

A brief rattle or tick sound when revving the engine may be heard on some 2014-2016 CTS Sedan (VIN A) and XTS models equipped with the twin turbocharged 3.6L V6 engine (RPO LF3) and 2016 ATS-V models equipped with the twin turbocharged 3.6L V6 engine (RPO LF4).

This sound is heard when the vehicle is in Park or Neutral and can sometimes be heard at the beginning or end of vehicle acceleration while in Drive. The brief rattle sound is a normal characteristic of the vacuum actuated turbocharger. Do not replace the turbocharger assembly for this condition.

Click below for an example of this normal turbocharger sound. (Fig. 16)


Fig 16

- Thanks to Bryan Salisbury
 

Rob

Administrator
Staff member
Joined
Nov 3, 2011
Messages
3,025
Location
New Hampshire
V-Series Cadillac(s)?
Not Yet!
This isn't a service bulletin. It's service information in GM's TechLink publication which goes to dealers.
 

Supporting Vendors

Taput Tunning LLC

Advertise with the Cadillac V-Net!

Torque Shop

Our Partner Sites

Top Bottom