engine idles fast then slow fast then slow, Plugs turn suty black

25

Asked by Apr 17, 2008 at 03:28 PM about the 1992 Volkswagen Cabriolet

Question type: Maintenance & Repair

Enine runs fast an steady for a few seconds, then runs rough for a few seconds, back and forth.

Then after a minute or cuts off.  I pull the plugs and they are sutt black, put clean plugs in and it starts right up again.

I rerplaced the Ignition coil, and fuel regulator, which works off of vacume and is attached to fuel rail.

Originally the car would run fine for much of the time, and run slugish for a few seconds and recorver, but now it does it all the time.

2 Answers

try throtle position sensor or collent tempure sinsor.

44,955

Might also try a new fuel pump or fuel filter, or perhaps injectors are bad. Sounds like too much fuel not burning off, check your timing advance as well.

Your Answer

Volkswagen Cabriolet Experts

  • #1
    Reelin68
    Reputation
    270
  • #2
    Scott Sr.
    Reputation
    230
  • #3
    tenspeed
    Reputation
    220
View All

Related Models For Sale

Used Volkswagen Golf
106 Great Deals out of 4,877 listings starting at $2,500
Used Volkswagen GTI
130 Great Deals out of 8,167 listings starting at $2,100
Used Volkswagen Jetta
599 Great Deals out of 34,344 listings starting at $1,295
Used Jeep Wrangler
341 Great Deals out of 17,170 listings starting at $2,999
Used Toyota Corolla
781 Great Deals out of 53,913 listings starting at $1,200

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.