Rough Idle on cold start-up on Audi A4 1.8T B8.5

30

Asked by Madaudi Jul 27, 2019 at 01:45 AM about the 2013 Audi A4

Question type: Maintenance & Repair

Hello, I have a 2013 Audi A4 1.8T B 8.5 (petrol). During a cold start-up the
engine rough idles and sometimes shuts off. I have to rev it up a little until its
warm. Once it warms the problem goes away. I changed spark plugs, PCV
valve, HPFP but still have this problem. Any help will be greatly appreciated.
Thanks.

2 Answers

30

Problem Solved. So it was the thermostat that was faulty. Problem is that I did not address this problem on time, now with a faulty thermostat this causes the engine to run lean on a cold start, hence the rough idle. If this problem is not address on time (like mines) it causes misfires on all 4 cylinders hence stretching the timing chain. So now I also have to change the timing chain as well. If you ever have a problem like mines, please address it urgently otherwise it will end up costing you much more in the end.

1 people found this helpful.

thanks similar problem here... last week noticed my thermo housing was corroded and the mechanic fixed/changed it.... but now idling badly till warm... ? wonder if he did something wrong ? will get him to check it out again

Your Answer:

Audi A4 Experts

  • #1
    Deathjam4
    Reputation
    8,080
  • #2
    lukeyramone
    Reputation
    1,020
  • #3
    Josh Holder
    Reputation
    830
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used BMW 3 Series
161 Great Deals out of 2,622 listings starting at $2,850
Used Audi A6
20 Great Deals out of 197 listings starting at $2,995
Used Audi A5
31 Great Deals out of 277 listings starting at $7,995
Used Mercedes-Benz C-Class
108 Great Deals out of 1,853 listings starting at $3,750
Used Audi A3
41 Great Deals out of 412 listings starting at $3,300
Used Audi S4
14 Great Deals out of 120 listings starting at $8,995
Used BMW 5 Series
32 Great Deals out of 649 listings starting at $2,299
Used Audi Q5
74 Great Deals out of 1,089 listings starting at $5,000
Used Honda Accord
56 Great Deals out of 1,937 listings starting at $1,495
Used Audi A7
7 Great Deals out of 130 listings starting at $13,999
Used Mercedes-Benz E-Class
56 Great Deals out of 810 listings starting at $4,998
Used Dodge Charger
41 Great Deals out of 845 listings starting at $800
Used Audi A4 Avant
8 Great Deals out of 37 listings starting at $3,995
Used Ford Mustang
40 Great Deals out of 1,799 listings starting at $5,750
Used Audi Q7
39 Great Deals out of 562 listings starting at $3,900

Used Cars for Sale

2019 Audi A4 For Sale
7 Great Deals out of 94 listings starting at $33,933
2018 Audi A4 For Sale
53 listings starting at $25,995
2017 Audi A4 For Sale
15 Great Deals out of 140 listings starting at $20,900
2016 Audi A4 For Sale
10 Great Deals out of 135 listings starting at $14,888
2015 Audi A4 For Sale
9 Great Deals out of 122 listings starting at $13,998

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. Content will be removed if CarGurus becomes aware that it violates our policies.