Audi a4 b5 idle

Asked by Oct 12, 2015 at 02:51 PM about the 1999 Audi A4 1.8T

Question type: Maintenance & Repair

So yesterday started problem with idle ,
when I'm driving and pressing the clutch it
goes down to ~ 850 rpms and goes then
back to ~ 1500 to 1800 rpms and doesn't
fall down to 850 rpms while I'm not stoped
a car and started to use petrol way to much
,  car is a Audi a4 b5 1.8t 20 v  ,engine code
aeb ,year 1999 , can someone help me

2 Answers

10,165

idling issues are usslay one of a few things. Your car lacks power (alternator problems), spark plugs are going bad, the fuel pump or fuel system has stuff in it or is going faulty, A vacuum leak from one of the many vacuum systems vw uses. The evap system may have a leak some where (key point to look Back wheel drivers side has a evap box in behind the plastic, The pipe for it tends to rot out and fall to pieces and requires replacement.)

3 of 3 people found this helpful.
5

The most common cause of rough idle on Audi and VW engines is either the N80 valve, ignition coils, or spark plugs. If you are mechanically inclined you can replace the N80 valve for about $40 and 45 min of your time. For the other 2 it is about the same amount of time but you need a special tool to remove the ignition coils. The parts run about $12 per spark plug and about $150 for all 4 ignition coils...or a $400-$600 job at a dealer (cost depends on your location).

Your Answer

Audi A4 Experts

  • #1
    Deathjam4
    Reputation
    3,550
  • #2
    lukeyramone
    Reputation
    540
  • #3
    Tom Demyan
    Reputation
    470
View All

Related Models For Sale

Used BMW 3 Series
1,037 Great Deals out of 31,467 listings starting at $1,000
Used Audi A6
127 Great Deals out of 6,165 listings starting at $2,488
Used Audi S4
52 Great Deals out of 1,754 listings starting at $4,450
Used Audi A3
75 Great Deals out of 4,728 listings starting at $2,995
Used Mercedes-Benz C-Class
589 Great Deals out of 23,286 listings starting at $1,995
Used BMW 5 Series
481 Great Deals out of 16,595 listings starting at $2,000
Used Honda Accord
1,000 Great Deals out of 62,552 listings starting at $999
Used Ford Mustang
743 Great Deals out of 42,668 listings starting at $1,300
Used Audi A8
58 Great Deals out of 2,003 listings starting at $2,750
Used Chevrolet Camaro
425 Great Deals out of 31,674 listings starting at $2,395
Used Honda Civic
830 Great Deals out of 78,168 listings starting at $900
Used Mercedes-Benz E-Class
465 Great Deals out of 19,781 listings starting at $1,500

Used Cars For Sale

2018 Audi A4 For Sale
1,683 listings starting at $38,955
2017 Audi A4 For Sale
48 Great Deals out of 2,896 listings starting at $24,999
2016 Audi A4 For Sale
17 Great Deals out of 221 listings starting at $21,491
2015 Audi A4 For Sale
14 Great Deals out of 479 listings starting at $16,400
2014 Audi A4 For Sale
62 Great Deals out of 1,293 listings starting at $12,995

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.