Question about Cars & Trucks
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.
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Posted on Feb 24, 2012
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Posted on Jan 02, 2017
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
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
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
Tips for a great answer:
Mar 27, 2013 | 2001 Volkswagen Jetta TDI
Engine stalling issue at low speeds
is commonly caused by a dirty automatic idle speed control valve and
throttle valve. Buy a can of throttle valve cleaner from NAPA or
Carquest (made by CRC chemicals) and spray it into the air intake
while the engine is running, use up about 1/2 the can, engine will
try to stall hold the speed up, shut it down and let it soak for 30
minutes, restart and blow out the remaining fluid, shut it down and
disconnect the negative battery cable for 5 Min's to reset the base
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