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

10,455

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
    3,650
  • #2
    lukeyramone
    Reputation
    560
  • #3
    Tom Demyan
    Reputation
    470
View All

Related Models For Sale

Used BMW 3 Series
1,160 Great Deals out of 33,062 listings starting at $1,000
Used Audi A6
138 Great Deals out of 6,487 listings starting at $1,995
Used Audi S4
54 Great Deals out of 1,635 listings starting at $3,995
Used Mercedes-Benz C-Class
639 Great Deals out of 26,319 listings starting at $1,900
Used Audi A3
99 Great Deals out of 5,049 listings starting at $3,250
Used BMW 5 Series
465 Great Deals out of 16,249 listings starting at $1,995
Used Honda Accord
1,085 Great Deals out of 61,516 listings starting at $1,099
Used Ford Mustang
690 Great Deals out of 37,937 listings starting at $895
Used Audi A8
71 Great Deals out of 2,121 listings starting at $2,450
Used Mercedes-Benz E-Class
485 Great Deals out of 19,796 listings starting at $1,200
Used Chevrolet Camaro
410 Great Deals out of 30,757 listings starting at $3,550
Used Volkswagen Jetta
576 Great Deals out of 35,861 listings starting at $1,000

Used Cars For Sale

2018 Audi A4 For Sale
2,995 listings starting at $35,191
2017 Audi A4 For Sale
33 Great Deals out of 2,130 listings starting at $25,877
2016 Audi A4 For Sale
11 Great Deals out of 229 listings starting at $20,995
2015 Audi A4 For Sale
18 Great Deals out of 652 listings starting at $16,995
2014 Audi A4 For Sale
68 Great Deals out of 1,232 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.