Question about 1991 Volkswagen Cabriolet

1 Answer

1991 VW Cabriolet runs rough during idle

My 1991 VW Cabriolet runs rough during idle but gets better with higher rpm's. I cleaned the idle stablizer on checked it by jumping the stabalizer and I could hear it open (engage). After I cleaned the stabalizer it ran good at idle for a short period then back to running rough.
Any clue??

Posted by on


1 Answer

  • Level 1:

    An expert who has achieved level 1.


    An expert that hasĀ over 10 points.


    An expert whose answer gotĀ voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 17 Answers

Check the hose between the inletmanifold and the pipe to the brakeservo it normally gets old and a crack in so the engine sucks false air on cylinder 4, causing engine to run rough or uneven.

Posted on Apr 14, 2009


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

VW Cabriolet RPM decreases

to me its sounds as though you have dirt ,gunk & grime ,water, in the main inline factory fuel filter, ,it will be a steel canister type, between the feul tank and the intake manifold, change filter,( u may need a mechanic, or someone handy with a spanner, once off, tip contents into and look for laquer peel, some tanks are seal with this, and it will some times peel ( especially if tank not kept full). if that is the case, have your tank taken out & cleaned, also, check airfilter, car will run better n cheaper to run, Hope this Helps. Kipper

Oct 27, 2014 | Cars & Trucks

1 Answer

1986 F2 5460 v8 runs good at higher rpm's runs rough when idling what can I do

Have you checked for air leaks in the intake after the air box

Jul 23, 2013 | Cars & Trucks

1 Answer

I cleaned out my choke with correct spray and now just replaced my idle air control sensor but the car is still

You are equipt with a idle speed control motor.There is no way cleaning is going to clear it,When the RPM jumps it is either working and trying to compensate for a vacuum leak.Have the vehicle running as it jumps up and down feel the EGR is it hot to touch? Becuase that can cause the jumping RPM,Check the PCV valve with the car running plug it does the RPM stabalize? If it does replace PCV. You are searching for a vacuum leak

Mar 10, 2012 | Cars & Trucks

2 Answers

Volvo 240 1991 stalling

CHeck fuel pump. Check oxygen sensor

Jul 12, 2009 | 1991 Volvo 240

1 Answer

Car starts fine..Idle is fast...stalls after car warms up

Check for vacuum leaks. Also try cleaning the ISV.

If that doesnt work go to and post your issue there

Jul 08, 2009 | 1989 Volkswagen Golf

3 Answers

1992 VW Cabriolet stalls out

Here is the common cause of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Jun 18, 2009 | 1992 Volkswagen Cabriolet

1 Answer

1992 cabriolet will not idle

The ISV (Idle Stablizer Valve) could be clogged or just not working. It's a cylinder with 2 vacuum lines and electrical connector going to it. Just above the valve cover and below the intake manifold. Best check for that is turn the key on engine off and the ISV should buzz. If it is buzzing remove it and clean it with some throttle body cleaner or brake clean. Reinstall and check for idle concerns. Have to be quick to see if it buzzes though. Better to have someone turn the key for ya while you check the valve. If it doesnt buzz replace it. Also check the switched on the throttle body. See if any of the wires are broken.

May 27, 2009 | 1992 Volkswagen Cabriolet

1 Answer

Runs rough at idle and low rpm. misfires. gets better @ high rpm

sounds to me you have a emissions problem check your EGR valve and MAP senser

Dec 28, 2008 | 2004 Chevrolet Malibu

Not finding what you are looking for?
1991 Volkswagen Cabriolet Logo

Related Topics:

939 people viewed this question

Ask a Question

Usually answered in minutes!

Top Volkswagen Experts

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers


Level 3 Expert

79865 Answers

Jeffrey Turcotte
Jeffrey Turcotte

Level 3 Expert

8836 Answers

Are you a Volkswagen Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides