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Posted on Jan 02, 2017
SOURCE: idle and stalling
Here is the most common cause of surges and stalls and low idle rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk 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.
Posted on Feb 21, 2009
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
SOURCE: idle to low
The idle is electronic, possible causes of this could be the idle air control valve, mass air flow sensor, and air hose from filter. You can verify if there are any leaks in your filter housing with a visual inspection, you can also remove the mass air flow sensor very easily and see if it is clogged with dirt.
Posted on Aug 31, 2009
Tips for a great answer:
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