BMW 328i Idle Control Valve
Indicators of a Bad Bmw 328i Idle Control Valve
It's never a good idea to have your Bmw 328i die on you in the middle of a traffic jam. Imagine the stress you'd have to endure when this happens. First is the bumper-to-bumper congestion you're in, followed by an engine that feels like it'll give way any time soon, and finally-when it eventually does-the anger other drivers have towards you because you made the traffic worse. Blame it all on the bad idle control valve installed on your car. This is a problem common on the 328i. To know if the ones in your car are about to cause you problems, look for any of these signs:
Stalls and deaths
A stalling symptom of a bad idle control valve usually occurs when a running car is at a slow speed. This happens because the mechanisms and valves inside, such as the idle control valve, have failed to properly regulate the oil and air mixture in the engine to keep it running. Aside from a decelerating or slow car, it's also possible that the engine immediately stalls right after the 328i is freshly started. It may seem fine the first few seconds after ignition, but then begins to stutter, and finally dies. Both scenarios indicate a bad idle control valve.
There's also a way to know if you have a bad idle control valve on your car without the need for the engine to die. With the car just creeping or at a standstill, observe the RPM needle of the tachometer. A perfectly running car should have a steady reading (at around 1,000 to 1,500 RPM). If it appears as if the needle tends to drop, then suddenly jumps, before it settles on a value, this should tell you that there's a problem with the valve in question.
Other than these performance-related symptoms, you can also check the parts surrounding the idle control valve. Look for any cracks, tears, and possible air leaks on the intake plumbing. There may also be too much dirt on the valve and the rest of the throttle body. These defects hinder the smooth and steady flow of air which results to wild RPM readings or a dead engine.