Notices
991
Sponsored by:

Name That Tune (Noise)

 
Old 05-24-2018, 03:58 PM
  #1  
vwduud
User
Thread Starter
 
vwduud's Avatar
 
Join Date: Oct 2016
Posts: 145
Default Name That Tune (Noise)

What would you identify this noise as?
Attached Files
File Type: mov
911NoiseVideo.MOV (406.5 KB, 58 views)
vwduud is offline  
Old 05-24-2018, 04:01 PM
  #2  
LexVan
Addict
Rennlist Member
 
LexVan's Avatar
 
Join Date: Jan 2013
Location: Chicagoland Area
Posts: 19,710
Default

Too short of a clip.

I assume cold start?
How long was it sitting?
Temperature?
What oil?
LexVan is offline  
Old 05-24-2018, 04:16 PM
  #3  
Code
Addict
Rennlist Member
 
Code's Avatar
 
Join Date: Feb 2013
Location: San Diego
Posts: 1,270
Default

Sounds like rod knock. Hopefully that's not the case.
Code is offline  
Old 05-24-2018, 04:20 PM
  #4  
CSK 911 C4S
Addict
Rennlist Member
 
CSK 911 C4S's Avatar
 
Join Date: Jun 2014
Location: Dickson, TN
Posts: 2,512
Default

Exhaust leak?

Stock exhaust or something else?
CSK 911 C4S is offline  
Old 05-24-2018, 04:22 PM
  #5  
vwduud
User
Thread Starter
 
vwduud's Avatar
 
Join Date: Oct 2016
Posts: 145
Default

Originally Posted by LexVan View Post
Too short of a clip.

I assume cold start? No. Parked after 30 minute drive. Sat for 30 minutes, re-start.
How long was it sitting? 30 minutes
Temperature? 85F ambient, coolant and oil temps just under 200F at shut down, before restarting
What oil? whatever came in the car and what Porsche puts back in when I bring it in for the maintenance intervals
See my answers in red above.
vwduud is offline  
Old 05-24-2018, 04:29 PM
  #6  
vwduud
User
Thread Starter
 
vwduud's Avatar
 
Join Date: Oct 2016
Posts: 145
Default

This problem has existed since before the 10K mile mark. Noted to Porsche multiple times (40k on engine now). Noise ONLY happens at start up and quickly goes away. Cold start vs. hot restart doesn't matter. I can go 4 to 6 weeks with it never doing this. Or, it can do it 3 times in the same day. I have numerous video clips of the same. And there have been times when I wasn't recording and it did this.

Once running, engine sounds and runs normal.

Porsche has it now for its 40k service, along with the clip I sent above. My hypothesis is that it is a lifter bleeding down (then clattering while it pumps back up) and is dependent upon where the engine stops, as to which lifter is trying to hold a valve open. Would possibly explain why it is so sporadic.
vwduud is offline  
Old 05-24-2018, 04:30 PM
  #7  
vwduud
User
Thread Starter
 
vwduud's Avatar
 
Join Date: Oct 2016
Posts: 145
Default

Originally Posted by CSK 911 C4S View Post
Exhaust leak?

Stock exhaust or something else?
Stock exhaust. No engine mods have been performed on this car.
vwduud is offline  
 


Thread Tools
Search this Thread
Quick Reply: Name That Tune (Noise)


Contact Us - About Us - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: