my audi is idling low and chugging while idling but runs good at higher speed. what could be the cause?

Asked by Apr 08, 2017 at 01:05 AM about the 2003 Audi A6 3.0

Question type: Maintenance & Repair

air filter, purge sylanoid and two motor mounts have all been changed but still is doing it. all sensor codes are reading good on diagnostics

4 Answers

5

Idle air control valve is a suspect. But should be throwing a diagnostic code.

And if it's not throwing code? I think it was reading oil pressure low. He's going to try and clean the screen in bottom of oil pan. Could that be it. Acts like a car that had had dirty gas. What about a fuel pressure rail regulator?

5

Could be something as simple as a vacuum leak. Particularly any of the lines under any center intake manifold cover and behind the motor; they get really heated, brittle and then crack. Sometimes they will seal when they are heated but leak when they are cold, so it makes it seem like the engine runs bad when it is cold. Simple stuff first. Break out the dish soap and check your vacuum lines. I have found my wife's bubble bath works great too. She gripes though when i get greasy fingerprints on the bottle though. Good luck.

It has been checked for leaks.

Your Answer

A6

Looking for a Used A6 in your area?

CarGurus has 152 nationwide A6 listings starting at $4,500.

Postal Code:

Audi A6 Experts

  • #1
    JRKPerformax
    Reputation
    260
  • #2
    Tom Demyan
    Reputation
    220
  • #3
    tenspeed
    Reputation
    210
View All

Related Models For Sale

Used Audi A4
46 Great Deals out of 695 listings starting at $1,895
Used BMW 5 Series
28 Great Deals out of 543 listings starting at $3,800
Used Audi A8
33 listings starting at $7,995
Used Mercedes-Benz E-Class
36 Great Deals out of 505 listings starting at $3,900
Used BMW 3 Series
142 Great Deals out of 1,900 listings starting at $2,300
Used Audi S6
20 listings starting at $18,888
Used Audi S4
7 Great Deals out of 174 listings starting at $9,495
Used Mercedes-Benz C-Class
142 Great Deals out of 1,498 listings starting at $2,900
Used BMW 7 Series
4 Great Deals out of 158 listings starting at $7,500
Used BMW X5
32 Great Deals out of 732 listings starting at $3,200

Used Cars For Sale

2018 Audi A6 For Sale
1 listings starting at $85,300
2017 Audi A6 For Sale
42 listings starting at $56,990
2016 Audi A6 For Sale
19 listings starting at $42,993
2014 Audi A6 For Sale
16 listings starting at $29,800

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.