OK so I have a 1990 Coupe 240sx I noticed it smelled like gas everytime i passed by it or sat in the car. The RPMs were either high or either so low at idle that it would shut itself off. I just swapped out the tach from single cam into the dual cam that i bought because I have a HUD and didnt work when I got it. Now I finally have gotten a chance to look at the motor and see that my injector is leaking so i pulled the gasket and bought a new one and still no luck it still leaks. What the hell can I do to stop this? Anyone got a spare dualcam? Really hope you guys can help me out getting really frustrated as I feel like I only get like 10 mpg. OH and the reason I mentioned about my tach is cuz when I but the sohc tach now it reads that the car is idling at 1800 which it doesnt sounds like and it, but that when it gets to low and shuts off it doesnt go to zero it stops at 1000 rpms...? wits up with that? Thanks for any help.

 

There are 4 seals on each injector. 2 are o-rings and the other 2 are bushings. Pull everything out again. Make sure that you replace at least all of the o-rings and put a dab of WD40 on each of the top ones before you put them back into the rail.

Normally, I push each injector into the rail just far enough for them to be held in. Next, align each injector with the appropriate hole on the intake manifold. Gently push the rail down so that the injectors slide into the holes. Make sure to apply even pressure along the entire rail. Now, take a rubber mallet and gently tap the rail several times above each injector. Finally, put the bolts back in the rail and tighten.