How to Remove Fuel Injector - 94 Q45

[rhollenbeck]

Hello all. This is my first post, even though I've logged dozens of hours reading the existing posts. And yes, I've searched, but can't find the specific info I'm looking for.

I've ohmed my injectors and know that #1 injector is dead (lucky that it is accessible!). Injector # 5 is iffy, but the rest tested fine.

I've located and acquired a full set of eight used injectors on the fuel rails from a wrecked 94 Q in a junk yard (got the whole engine actually, for practically nothing). I know that the three accessible injectors ohmed fine (~10.8 ohms each).

Now it's time to remove the bad #1 injector and I can't figure out how to remove it. Looks easy enough. I removed the "cap" with two screws (although stripped one of the screws a bit in the process). I followed the process for removing fuel pressure. But now I can't figure out how to remove the injector without applying excessive force.

Does the injector now just lift straight up and out? I can spin it, but it won't pop out. The plastic casing (tan, by the way) is easily torn up if I try to pry it or pull it with pliers. I'm afraid of destroying it in case it can be refurbished.

I see two holes, one on either side of the metal pin on top. Is there a special tool that inserts pins into these holes to remove the injector?

Any help from all of you experienced Q45 folks would be greatly appreciated! I've learned a tremendous amount from reading the NICO forums. Someone has a quote in his signature block, I think Wes - something to the effect of reading these forums is like getting a masters degree. I couldn't agree more.

In this case I need help on my homework, teacher.

-Ron

[Mint Q45A]

Ron,Yes the injectors come out pulling them straight up. Unfortunately it can get tricky because the 0-rings are old and hardened inside the rail. I suggest you add some light weight oil around the top of the injector so that it sips in through the gap between the injector and the rail; let it sit for a while, continue to spin it and gradually try to apply some force upwards, trying to rock the body of the injector from side to side. It will eventually just pop up...I believe there's a tool that fits on the two holes on the sides, but a pair of flat-head screwdrivers should work too. Be patient... and don't apply too much force; the plastic is already quite brittle because of the years of operation/heat and can easily break.

You may want to read some of these postings; there's lots of good information:

zerothread?id=246600

zerothread?id=210534

You may want to consider simply sending the whole set of fuel rails to Deatswerks - they will clean the injectors and replace the o-rings and caps, install them back on the rails and pressure test the whole assembly....peace of mind...


Modified by Mint Q45A at 5:41 PM 2/10/2008

[rhollenbeck]

Excellent info. Thanks.

I'm getting ready for the dive under the plenum. I think I will send the rails and injectors I just acquired to Deatchwerks. I'll replace the whole set that are in my Q now with that "new" set at the same time I do everything else under the plenum.

For now, though, I'd like to get the car running by replacing just the #1 injector. I read about the danger of hydro-locking, so will follow the procedures carefully.

I'll let you know how the injector removal and replacement goes - most likely next weekend.

Thanks again for the help.

[Q451990]

Check out this link detailing removing injectors on a 300ZX with the same style injector. http://www.300z.co.nz/index.ph...id=32Ignore everything before step 33. This won't help with removal on the car, but it looks like the best method I have seen when you have the rails out of the car.

Heath

[Denver90Q]

Just yank them out with some visegrips. Unlikely to have any salvage valve if they ohm test bad.

[rhollenbeck]

This won't help with removal on the car, but it looks like the best method I have seen when you have the rails out of the car.

Thanks, Heath. I really like that method, using a piece of pvc and a socket in a vice to press the injector out of the rail. Simple and controllable.

[rhollenbeck]

Just yank them out with some visegrips. Unlikely to have any salvage valve if they ohm test bad.

If there really is no hope of salvaging the injector I see no harm in trashing it while removing it.

There was a complete open circuit on the ohm test. Does that mean the injector cannot be refurbished?

On the other hand, I look at this as good practice - learning how to remove an injector without trashing it. There may come a day when I want to save one that I'm pulling out!

-Ron

[Q451990]

I think refurbishing an injector just means bench cleaning it and putting new o-rings on it, and maybe new pintile caps. As far as I know, there's no fixing one that ohms bad.

Heath