A flickering check engine light with a rough idle on a Ford Transit IV usually points to a vacuum leak, ignition problem, or a failing sensor. Here’s what to check first and whether you can keep driving.
What Your Transit Is Trying to Tell You
When your Ford Transit IV starts idling rough and the check engine light flickers rather than staying steady, it's not a random glitch. The engine is running lean or misfiring intermittently, and the ECU is catching it in real time. This often happens at idle because that's when the engine is most sensitive to small changes in air, fuel, and spark. The good news? Most of the time it's a relatively simple fix.
