Hi guys,

 

finally ordered my 555 Nismos, boost jets and eprom for ECU. Installation is due just before Xmas. Not quite sure about the "how to´s", though.

 

I think I saw detailled instructions about how to change fuel injectors on the web before, maybe even in this forum. Could not find it using the "search", though. Anybody can help with the link?

 

Thanks,

 

Alex

thers a few ways to do it bud, one is to remove the plenum and do it that way which is the way im gonna do it as you can do quite a bit with the plenum off, the other way is to grind a small amount out of the plenum to allow access to the injector screw.

Look here for a virtual bible on the Z

 

http://www.aus300zx.com/tech/

http://www.jdmfairladyz.com/downloads/images/plenumpull.pdf

 

It's a bit of a ******* to do tbh, even with the water hoses & EGR removed like mine was, hate to try with them intact.

I found it impossible to do even with the fuel rail left on the car. It was easier to take it off and then press the old injectors out and from my experience, you have to carefully press the new ones in. It is a very delicate job and expensive if you get it wrong.

Full plenum removal and injector replacement guide here

 

Steve :)

I found it impossible to do even with the fuel rail left on the car. It was easier to take it off and then press the old injectors out and from my experience, you have to carefully press the new ones in. It is a very delicate job and expensive if you get it wrong.

 

Agreed! The injectors get well and truly stuck in when they've been installed for >10 years and there is nothing you can get a decent grip on to pull them out. Remove plenum and fuel rail then press old injectors out from the bottom. If you want to re-use the old injectors later on then make sure you don't damage the plastic cap on the nozzle. While the plenum is off, do the throttle body coolant bypass and replace the old fuel lines and clamps, also the PCV valves and hoses... ALWAYS use new o-rings on the injectors and also replace the lower rubber insulators as these crack with age and can cause boost leaks once disturbed...

Gays, that was a lot of valuable information, thanx so far. IS it possible to re-use the stock injectors at all, meaning did anyone get out in one piece? If so, how much more work is it to get the fuel rail off? And last: I could get the injectors changed for say 200, including seals and gasgets - should I?

Gays, that was a lot of valuable information, thanx so far. IS it possible to re-use the stock injectors at all, meaning did anyone get out in one piece? If so, how much more work is it to get the fuel rail off? And last: I could get the injectors changed for say 200, including seals and gasgets - should I?

 

 

Sorry, I mend: Guys! :nono: Was typing too fast. :)

LOL thought you knew them personally :D

As previously stated, the pressing out process is the key. You need to avoid the tip and press against the base. The fuel rail is also an irregular shape and care is also needed not to damage other injectors still in the rail. The other real pain that I came across is the earth strap bolt on the rail which really requires to be remove before removing the rail was real tight and unable to use a socket because of its locallity, the philips screwdriver bit I used chewed up the head. This also applies to the retaining caps on the injectors which are held by screws, not bolts so no socket can be used. Make sure you have a good fit quaility screwdriver as they seem soft and round off, and cannot be re-used. The plenum gasket and injector seals should set you back a total of £70. If you do an under plenum water bypass, add another £10 for pipe. It would probably be advised to change the PCV valves if they are old, so add £80. Good luck.

>> make sure you don't damage the plastic cap on the nozzle.

 

injector will work absolutely fine without the plastic cap...found out the hard way ;)

...as long as you don't damage the small (and brittle) injector needle/nozzle

The trick with the screws is to hit the back of the screwdriver with a hammer while turning ;) Quite fiddly to do at first but once you have the knack its not too bad :) Probably best loosening the screws before removing the rails since its such an awkward shape to clamp in a vice ;)