5 Injector Fault Symptoms You Shouldn’t Ignore

Rough Idle? Might Be Your Injectors

Your injectors fire up to 30 000 times a minute.
When one goes out of balance, you’ll feel the difference fast—poor MPG, smoky exhaust, maybe even limp mode.

Below are the five red-flag symptoms we see every week on Trafic, Vivaro, Master and Movano vans.

1 · Diesel Knock at Idle

A metallic tap that disappears above 1 500 rpm often means one injector over-fuelling.