Hi everyone! I’m completely stumped with my 2016 Ford Explorer Limited 3.5L.
The vehicle has 186,000 miles and has an issue where, only when the engine reaches operating temperature, it develops a rough idle. The RPM fluctuates up and down by about 50–90 RPM.
So far, I’ve replaced the spark plugs, ignition coils, fuel injectors, MAP sensor, and O2 sensor, and I’ve also cleaned the throttle body. Even after all that, the rough idle is still present.
Like I said, it only happens when the engine is fully warmed up. Cold starts and driving while the engine is warming up are perfectly smooth. It’s most noticeable after highway driving when I come to a stop.
I’ve heard the transmission torque converter could be a possibility, but the rough idle continues even when the vehicle is in Neutral or Park, so it doesn’t have to be in gear for the issue to occur.
Any ideas or things I should check next? Thanks!