The rough running on cold start suggested a problem. I plan on getting the battery tested tonight just to eliminate that as a possible weak link (i am pretty sure that's not the issue though since it doesn't. The core problem was a 2013 audi s3 2.0 tfsi exhibiting rough idle, stalling at stops, and an illuminated check engine light
Cold start bad rough idle tfsi software fix - YouTube
A similar past case on a bmw 320i pointed to a failed idle air control valve as a likely.
Fix rough idle at startup with this expert guide from an ase master technician
Diagnose & repair cold start idle, maf sensor issues, vacuum leaks, iac valve faults, choke problems, and more. Learn to diagnose rough idle issues in your audi s3 by understanding engine systems, common symptoms, and effective troubleshooting methods at repairpal.com. The car shook and vibrated allot and then this. So, i did the carbon cleaning, replaced the fuel injectors, put in new plugs and new ignition coils but still at cold start up the idle isn't quite as smooth as it was.
Although i did notice a minor issue right away In the morning when i first start out So this is on a cold engine I pull up to the first stop sign or light and come to a complete stop i notice the idle will.
Explore the audi cold start problem, its causes, owner experiences, and essential facts to keep your vehicle running smoothly.
Parking at work, slowed to a stop to reverse into a spot and heard the engine revs hunting The engine computer has a warm and cold engine start program and when the ect fails, the computer only selects the warm engine program It does this because the cold engine program. A 2013 audi s3 was experiencing a check engine light, rough idle, and frequent stalling, especially at idle
The suspected core problem was a failing idle air control (iac) valve Ive only ever had this issue in the winter until now When it's cold, starts up with no issues what so ever
