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Why does the idle go up and down and stall after warm up on a 2001 jetta?

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  • Cars & Trucks Master
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Hi there:
First thing is to check for air leaks. There is a metal pipe that goes around the back of the engine to the side of the block by the Distributor. This is on top of the valve cover. It is a silver cylinder with two black hoses going to it and a electrical connection. Remove the hoses and electrical connector. Just use some carb cleaner and spray in the valve from each direction where the hoses attached.

Make sure you dont have any split vacuum or crankcase hoses. This will casue a big vacuum leak and bad idle.

Next thing is the idle air screw on the throttle body take it out and count the turns so you can put it back in the same spot. There is an o-ring that breaks and causes an air leak. The Idle Stabilizer Valve (ISV) could be dirity and may need to be cleaned.

Also, keep in mind that the headgasket may have an affect on the idle if it is affecting the compression.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Posted on Feb 24, 2012

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Posted on Jan 02, 2017

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SOURCE: 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 vwvortex.com and post your issue there

Posted on Jul 08, 2009

  • 10 Answers

SOURCE: 2001 Jetta 1.8 turbo - a/c intermitently goes warm

its prob the cooling fan its located in a housing along with the radiator fan at the front of your engine bay look down when you open the hood . and make sure the fan is spinning run the ac on high and wait ( do this while the car is running of course ) . do not run your ac if the fan isnt working . you will burn up the compressor . the noise and vibrations you feel are from the compressor turning on and off.
now if the fan is working its prob the compressor. if all else fails take it to a mech where they can test it ... its not pricey and its quick

Posted on Jul 12, 2009

  • 752 Answers

SOURCE: why would my 2001 mercury grand marquis stall when

check yur idle air control valve

Posted on Jan 26, 2010

  • 24 Answers

SOURCE: the idle of my 2001 jetta 1.8 turbo fluctuates

It is probably the throttle position sensor.

Posted on Jan 30, 2010

  • 80 Answers

SOURCE: 91 buick idles up and down after it watms

Check the Throttle Position Sensor and Egr vavle. Look closely at all vaccume lines and check for cracks, breakage and colasping lines.

Posted on Feb 08, 2010

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Hi there:
You will need to check O2 sensor, MAF sensor ,IAC and EGR valves, plugs, wire and coils and vacuum leak.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

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