Rough idle after TB change, sparks, & 90k - AudiWorld Forums

Go Back  AudiWorld Forums > Audi Models > Audi A8 / S8 > A8 / S8 (D2 Platform) Discussion
Reload this Page >

Rough idle after TB change, sparks, & 90k

A8 / S8 (D2 Platform) Discussion Discussion forum for the D2 Audi A8 and S8 produced from 1994-2002

Rough idle after TB change, sparks, & 90k

Old 08-23-2005, 05:36 AM
New Member
Thread Starter
Join Date: May 2005
Posts: 48
Default Rough idle after TB change, sparks, & 90k

I see this may be an old subject, but was very surprised how rough the idle was after getting my car back. Car has always been very quiet and no noticeable vibration on idle. Now it gently rocks like you are in a pickup. I replaced the spark plugs with the bosch +4. Could this really make that big of a difference?. Not sure what plugs were in before- whatever the dealership puts in. Any other ideas on what could have happened during the service?
saul222 is offline  
Old 08-23-2005, 05:46 AM
AudiWorld Senior Member
Join Date: Aug 2001
Posts: 3,668
Default Not likely the spark plugs, but if whoever did the TB service didn't....

get the cam timing exactly correct then a rough idle is one of the possible outcomes. I'd take it back to the mechanic that did the TB change and complain- see what they say. If it was a stealer, they will no doubt shovel you the "they are all like that" line of bull.
skiracer is offline  
Old 08-23-2005, 05:50 AM
AudiWorld Super User
Join Date: Jul 2001
Posts: 18,412

Yes, my car was significantly smoother after TB change
PaulW is offline  
Old 08-23-2005, 05:58 AM
AudiWorld Super User
Join Date: Apr 2003
Posts: 2,300
Default I seem to remember some posters complaining about +4s in their A8s .. roughness.

I used the Search Tool, and golly if it didnt actually WORK this time .. I found the last thread on this, using "Racing spark plug" as the search term.
Jkay is offline  
Old 08-23-2005, 07:08 AM
AudiWorld Super User
Join Date: Jan 2002
Posts: 2,167
Default Could be a plugged fuel injector. Put 2 bottles of Techron fuel injector cleaner in a full tank.

<center><img src=""></center><p>
Although if the problem occured after a TB change, this may not be the case.

See this older post of mine...<ul><li><a href=""></a</li></ul>
escapA8 is offline  
Old 08-23-2005, 07:11 AM
AudiWorld Super User
Join Date: Jan 2002
Posts: 2,167

I have had those plugs for 2 years now and now problems what-so-ever.
escapA8 is offline  
Related Topics
Thread Starter
Last Post
A8 / S8 (D3 Platform) Discussion
11-21-2017 01:45 PM
A6 / S6 (C6 Platform) Discussion
09-08-2015 11:52 PM
Vehicles For Sale
09-08-2015 12:12 AM
A8 / S8 (D3 Platform) Discussion
09-07-2015 03:36 PM
2.7T V6 Discussion
09-04-2015 04:26 AM

Thread Tools
Search this Thread
Quick Reply: Rough idle after TB change, sparks, & 90k

Contact Us Archive 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 and affiliated sites.
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: