You might notice your transmission fluid levels dropping constantly with no visible leaks on your driveway. 🛠️ How to Diagnose and Fix It
This fluid travels up the vacuum line and straight into the engine's intake manifold. 2. The "Hardcore" Symptoms
💡 If you’ve just replaced a blown modulator, remember to clean out the vacuum lines. Residual fluid left in the lines can still cause smoke and rough idling for a few miles until it’s fully cleared out.
As the engine burns the ingested transmission fluid, a thick, acrid cloud of white/grey smoke pours out of the exhaust.
Inside the modulator is a flexible rubber diaphragm. Over time, heat and age cause this rubber to crack or rupture. When this happens:
When a transmission starts sucking fluid into the engine, the symptoms are immediate and hard to ignore: