The 1.9L F9Q engine is well know for having problems with the injectors being seized into the cylinder head, especially when fitted to the Renault Trafic, Vauxhall Vivaro and Nissan Primastar vans.
The two injectors nearest to the timing belt end of the engine, (cylinders 3 and 4) tend to be the worst for becoming badly seized. There is no definative reason why these injectors seem to be the worst but it may be due to the way the water runs from the engine mounting.
Failures of injectors fitted to this vehicle are usually of a mechanical nature where excessive fuel leak off can result in low fuel pressure, the symptoms of this will often be either poor starting or after start up vehicle will idle but will not rev.
If any fault codes are stored for misfire or injector circuit faults it is worth removing the air filter housing and checking the wiring at the injector multiplugs as it is also common for the air filter housing to rub through the injector wiring.
The image on this page shows our hydraulic injector pulling equipment fitted to cylinder number 3 on a Vauxhall Vivaro fitted with the F9Q engine.