looking under the hood today i see what looks like oil or fuel leaking out around the #4 injector.. is that just an o ring i need to replace or what? ive never had to take injectors out of this car so can someone give me some tips?? thanks in advance... it's a jdm b18c motor

 

Yup, if it's leaking from the top, most likely it's just an O-ring. If you have a spare set of injectors carefully remove one of the O-rings and swap it over. As for removing the injectors, it's pretty simple. Remove the 10mm (head) nuts/bolts that hold the rail on, carefully slide the rail up, and pop the injector out of it. You can try leaving the wiring harness connected but it's easier to release the connector, allowing you to completely remove the injector. When it comes time to reinstall the rail, seat all the injectors in the rail FIRST (lubricating the O-rings with a little oil helps), then slide the rail down, watching that each injector is aligned with it's runner. DO NOT put the injectors in the manifold, then smash the rail down on top of them, this can cause O-ring damage.

 

It's probably the o-ring but check carefully and make sure you know where it's leaking from....

I have DSM 450s in my car and when I first installed them one of them was leaking really bad. I inspected it really carefully and found that gas was leaking INTO the harness clip! I took the clip off and it was filled with gas. (talk about a fire hazard!)...

I ended up having to replace that injector with another one. I don't know if this is common or not with DSM injectors, but just thought I'd add my experience.

 

alright.. thanks guys. ill try the o-ring and hopefully that will do the trick.