2003 Beetle Rough Idle Worsens after Throttle Body cleaning

Asked by Apr 06, 2017 at 06:21 PM about the 2003 Volkswagen Beetle GLS 1.8T

Question type: Maintenance & Repair

Anyone out there got any knowledge working on
these? Not like my hondas and nissans. So heres
the problem, had a rough idle. Very rough while
check engine light is on. Check engine light goes
off and TRAC control light comes on and so does
EPC light. When those are on the car idles fine. It
sounded like Throttle Body needed cleaned. Pulled
it out as shown below and cleaned it, theb put back
in. Now the car runs worse and brakes tighten up. I
had battery dissconected and im too worried to
drive it so it cycles back on to pull codes. Any
ideas? Im lost. I know its most likley a vaccum leak
but how did it get worse?

1 Answer

113,665

This is not a jap car, this fine german engineering. The 2003 throttle body is a fly by wire and really shouldn't have been cleaned or should I say soked with cleaner. On the side of of the throttle body there is a black box, there are clips if you take those off this will allow you to open this box, you will see a series of four contacts these ride on four strips on the black box, these strips needs to be cleaned if you have carbon build up. Then ohm them out for proper function. Then ohm from the connector to the strip for proper function. If everything checks ok , put it back together and try it, make sure you check all the vacuum lines for any leaks. But If it were me I just replaced the whole throttle body and sensor and install all new vacuum lines. VW products are very temperamental and everything has to be just right in order for the car to run properly...

Your Answer

Volkswagen Beetle Experts

  • #1
    tenspeed
    Reputation
    1,840
  • #2
    Chris Billings
    Reputation
    1,570
  • #3
    Tom Demyan
    Reputation
    1,410
View All

Related Models For Sale

Used MINI Cooper
289 Great Deals out of 11,002 listings starting at $1,490
Used Volkswagen Jetta
641 Great Deals out of 35,859 listings starting at $1,500
Used Honda Civic
810 Great Deals out of 60,283 listings starting at $950
Used Ford Mustang
582 Great Deals out of 39,721 listings starting at $1,895
Used Jeep Wrangler
494 Great Deals out of 19,454 listings starting at $1,999
Used Honda Accord
1,056 Great Deals out of 74,030 listings starting at $1,100
Used Volkswagen Golf
100 Great Deals out of 3,742 listings starting at $1,200
Used Volkswagen Passat
518 Great Deals out of 26,917 listings starting at $1,990
Used Toyota Corolla
949 Great Deals out of 66,420 listings starting at $1,699
Used Volkswagen GTI
151 Great Deals out of 6,046 listings starting at $1,490
Used Toyota Camry
1,103 Great Deals out of 85,758 listings starting at $995
Used Chevrolet Camaro
440 Great Deals out of 31,638 listings starting at $1,450
Used BMW 3 Series
1,087 Great Deals out of 32,638 listings starting at $1,200

Used Cars For Sale

2017 Volkswagen Beetle For Sale
5 Great Deals out of 1,466 listings starting at $11,624
2016 Volkswagen Beetle For Sale
34 Great Deals out of 476 listings starting at $10,583
2015 Volkswagen Beetle For Sale
23 Great Deals out of 521 listings starting at $8,500
2014 Volkswagen Beetle For Sale
38 Great Deals out of 670 listings starting at $6,997
2013 Volkswagen Beetle For Sale
48 Great Deals out of 727 listings starting at $6,350

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.