2000 4.2 , noise under intake manifold - AudiWorld Forums

Go Back  AudiWorld Forums > Audi Models > Audi A8 / S8 > A8 / S8 (D2 Platform) Discussion
Reload this Page > 2000 4.2 , noise under intake manifold
Notices
A8 / S8 (D2 Platform) Discussion Discussion forum for the D2 Audi A8 and S8 produced from 1994-2002

2000 4.2 , noise under intake manifold

Reply

 
 
Old 01-28-2018, 07:53 PM
  #1
AudiWorld Newcomer
Thread Starter
 
Join Date: Jan 2018
Posts: 2
Default 2000 4.2 , noise under intake manifold

Main question is an intermittent clicking/rattling noise from under/inside the intake manifold. More prominent when warm. During idle I rev up to about 2500/3000 clicking/rattling noise happens during rev up, as it revs back down you can hear the clicking/rattling again right as it goes back down below 1000 rpm. In addition there is a constant whining sounds that sounds like the timing belt is over tighten or the tensor(s) are too tight? Unless the pulleys or tensioners re are possibly the culprit..?

Currently have 195k miles on the 4.2, Timing belt was done by previous owner at 150k. Both noises seems to start a few weeks ago.

I’m taking it in to a few Independent shops this week, but looking for input….I’d really appreciate it. …Thanks
davek4300 is offline  
Reply With Quote
Old 01-29-2018, 12:03 PM
  #2
Audiworld Junior Member
 
Join Date: Aug 2015
Location: Atlantic Oceanfront, Florida
Posts: 44
Default

I would inspect the cam chain adjusters under each head cover. If the guide failed or broke then the chain could be metal to metal. Don’t wait on fixing it. Change the oil and filter. I would change it twice — once wit cheap oil and run it for 5 minutes, drain and then change it again (oil and filter) with the proper oil.
Florida8L is offline  
Reply With Quote
Old 02-01-2018, 10:36 AM
  #3
AudiWorld Senior Member
 
Join Date: May 2003
Posts: 1,072
Default

My 2000 A6 4.2 had a rattle from the tensioners when you revved it quickly. That vintage engine always did it. Mine was around 1000rpm. It made that noise for 100,000 miles. Yours doesn't sound like that. Ideally, pull the driver side valve cover and inspect the tensioner pad.

If you do need to change the tensioners it's considerable work. You have to pull the timing belt and driver side cams. Passenger side is easier. If you've never had an engine apart I wouldn't suggest it. The tensioners are roughly $500/side.
JAA 4.2 is offline  
Reply With Quote
Old 02-06-2018, 08:08 PM
  #4
AudiWorld Newcomer
Thread Starter
 
Join Date: Jan 2018
Posts: 2
Default

My independent Audi shop is indicating it seems to be resonating from under the intake manifold. In fact upon inspection the intake seems to be missing some parts and the flaps are locked. Which is crazy because it has tons of torque and idles perfect., no hesitation sluggishness. Just that damn internal noise...almost like a metallic clicking. I'm getting a quote on a used /tested manifold.

btw..the chain and tensioners are good.
davek4300 is offline  
Reply With Quote
 
 
 

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Newbie123
A6 / S6 (C6 Platform) Discussion
3
01-30-2018 09:46 AM
TFT
A8 / S8 (D3 Platform) Discussion
7
01-11-2018 01:02 PM
NCSAR
Vehicles For Sale
1
01-09-2018 06:59 AM
Caleb5947
2.0T FSI Discussion
0
01-03-2018 09:15 PM
Caleb5947
A4 (B7 Platform) Discussion
0
01-03-2018 07:51 PM

Thread Tools
Search this Thread
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -8. The time now is 07:27 PM.


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: