RS4 (B7 Platform) Discussion Discussion forum for the B7 Audi RS4
Sponsored by:
Sponsored by:

Jumpy Idle - B7 RS4

 
Old 09-04-2016, 08:51 AM
  #1  
Audiworld Junior Member
Thread Starter
 
e36graduate's Avatar
 
Join Date: Oct 2007
Posts: 20
Likes: 0
Received 0 Likes on 0 Posts
Default Jumpy Idle - B7 RS4

After 115K miles of pretty much reliable driving, I am starting to have to chase down an issue and need some input:

At idle, RPM's jump from 800 to 1200 then back down to 800 and up to 1200, over and over, consistent up and down.

If I take out the dip stick while this is jumpy idle is happening, the idle smooths out to almost perfect?

I checked the MAF on a 1st gear pull and it seems to be measuring correctly.

The adaptive results while the RPM's are up and down are:

Bank 1 (idle/partial)
-2.6% / 0.0%
Bank 2
-1.5% / -4.7%

The other day, I took out the dip stick for about a minute while the idle smoothed out.....I put the dip stick back in and the was still smooth The next 2 days the car seemed to be much more responsive and powerful....today, the idle is jumpy again.

Upon COLD START - the initial idle is much higher than normal during a cold start....like almost 2000 rpm's before it kicks down to lower RPM.

My gut tells me the oil separator may be kaput ??? Any other ideas?
e36graduate is offline  
Old 09-07-2016, 03:41 AM
  #2  
AudiWorld Super User
 
ELEVENS's Avatar
 
Join Date: Jun 2006
Location: great lakes, yoo ess of eh
Posts: 4,596
Likes: 0
Received 0 Likes on 0 Posts
Default

I'd start looking around for a vacuum leak, especially under the manifold and as far back as the trunk (exhaust flap solenoid and reservoir). The easiest way is to spray a tiny amount of starter fluid or carb cleaner on the various suspects while the motor is idling and be alert to rpm increases.

Good luck and let us know what you find.
ELEVENS is offline  
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
sducotey
Audi A5 / S5 / RS 5 Coupe & Cabrio
2
03-19-2019 01:55 AM
StealthB4
Audi 90 / 80 / Coupe quattro / Cabriolet
0
12-06-2007 01:19 PM
suffieldmedic592
Audi 5000 / 200 / V8 Discussion
2
10-16-2005 02:07 PM
90qt
Audi 5000 / 200 / V8 Discussion
2
12-14-2004 08:59 PM
G_Factor
A4 (B5 Platform) Discussion
2
07-07-2002 10:07 PM


Thread Tools
Search this Thread
Quick Reply: Jumpy Idle - B7 RS4


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 Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: