Faulty idle air control actuator: The idle air control actuator controls the engines RPMs when it is idling. This actuator receives information from the electronic control unit (ECU) so it knows at what RPM to keep the engine for a smooth and safe idle.
Jul 07, 2008 · I am about to buy my first car, and not a genious on cars, so want to ask you wise guys a question. I went to see a VW Mk4 1.4 Golf MATCH today, all was good. After a test ride, I left it with engine running, and it was just revving up and down a small amount, is that normal? That was the...
Jun 30, 2020 · Since the AC compressor is driven by the engine, it doesn’t pump as much refrigerant when you’re at a stop or driving slowly. If the system is low on refrigerant, it will show up as AC blows warm at idle and blows colder when the engine is running at higher RPMs. Get your system refrigerant level checked.
Rough Idle When Starting Cold, Then Goes Away When Engine Is At Operating Temperature More Details Below I have an older, low mileage vehicle with a V8 engine. When the engine is started cold, regardless of the outside temperature, the idle is rough and there is a noticable power loss.