Idles to fast

Debbie Miller

Asked by Apr 07, 2015 at 02:02 PM about the 1986 Volkswagen Cabriolet Base

Question type: Maintenance & Repair

Idles to fast, cuts off when in gear

5 Answers

Chris Van Kleeck

You need to check for vacuum leaks; disconnected or frayed hoses or plastic tees, etc. Vacuum leaks will allow the idle to be too high, and the CIS-E fuel injection system depends on good engine vacuum to operate properly.


1979 to 1988 Cabriolets are CIS fuel injected. NOT CIS-e. Generally look for vacuum leaks, but I suggest replacing the O-Ring on the idle adjust screw located on the rear of the throttle body assembly.

2 out of 2 people think this is helpful.
Debbie Miller

Thank brother did find 2 vacumn leaks which improved the idle, but still cutting off after running for a few minutes. Someone says it may be the fuel flow sensor. Any feedback on that would be appreciated. We are not too familiar with foriegn autos and I will most likely end up selling, but want to fix the problem first.

Debbie Miller

I also heard it could be the fuel pump and read where it has 2 fuel pumps and can be removed through the floorboard under the back seat! Help...


The main fuel pump is underneath the car. Located just forward of the rear right wheel. The fuel transfer pump is in the fuel tank, and can be accessed from under the rear seat. If you go to http// you will find both help and how to advice. The fuel pump in the tank would be my next choice for the stalling out issue.

Best Answer

Your Answer

Add photo

Related Questions


Looking for a Used Cabriolet in your area?

CarGurus has 10 nationwide Cabriolet listings and the tools to find you a great deal.


Search Volkswagen Cabriolet Questions

Volkswagen Cabriolet Experts

#1 Reelin68
Reputation 230
#1 Scott Sr.
Scott Sr.
Reputation 230
#3 tenspeed
Reputation 200
View All

Related Models For Sale

Used Volkswagen Jetta"
655 Great Deals out of 32,416 listings starting at $1,200
Used Volkswagen GTI"
111 Great Deals out of 6,105 listings starting at $2,900
Used Volkswagen Vanagon"
36 listings starting at $10,970
Used Ford Mustang"
743 Great Deals out of 41,405 listings starting at $900
Used Volkswagen Passat"
278 Great Deals out of 22,234 listings starting at $1,299
Used Volkswagen Golf"
36 Great Deals out of 2,668 listings starting at $2,250
Used Honda Civic"
1,191 Great Deals out of 58,279 listings starting at $1,300
Used Toyota Pickup"
128 listings starting at $2,999