Video: Fuel Injector Removal & Reinstallation After Cleaning, 1991-2005

[Wild Turkey]

I wasn't sure if anyone other than @Chris_Lum was allowed to upload videos to this sub-forum. His videos are an inspiration to me.

My 1st video. Suggestions, and especially corrections, welcome.

This is a follow-up from:

You probably need your fuel injectors cleaned/cleaning interval recommendations

My search didn't seem to yield a thread on fuel injector cleaning. If you're not routinely cleaning your fuel injectors, you probably should. It's not mentioned on the service schedule, so when should we? Searching online yields suggestions from yearly/12,000 miles to up to 90,000 miles. I wound...

www.nsxprime.com

 

[Honcho]

Nice job, Tim.

 

[Chris_Lum]

I’m reporting you to the admins…oh wait good work Tim!

 

[AvroPac]

Great Job!
I just removed my injectors for cleaning. The only thing I did slightly different was that I removed the fuel feed line at the fuel filter, and not on the fuel manifold. I am changing the fuel filter at the same time and it comes with the crush washers on that end of the feed line. This did add the extra step of removing the two cover plates on the right side of the forward valve cover.

 

[Wild Turkey]

Great Job!
I just removed my injectors for cleaning. The only thing I did slightly different was that I removed the fuel feed line at the fuel filter, and not on the fuel manifold. I am changing the fuel filter at the same time and it comes with the crush washers on that end of the feed line. This did add the extra step of removing the two cover plates on the right side of the forward valve cover.

A couple of other Primers like @acuhon have also recommended this, that you clean the injectors when you change the fuel filter, and I agree.

I actually did the fuel filter at the same time as well, but I edited the fuel filter change out because @Chris_Lum had already done such an excellent video on the fuel filter change, and my video was getting too long. (You can tell because the line from the fuel filter to the forward fuel rail is just lying limp, since it's disconnected from the fuel filter and the support mounted under those 2 cover plates.) As a result, I had to "add" the manifold/rail disconnection from the SM, which you can see me doing by hand . After a week with no corrections, I just re-edited the video to remove about 60 seconds of pauses & "um's" and I'll call that done.

 

[Chris_Lum]

@Wild Turkey, you inspired me to send my injectors in, so while I was removing the injectors I decided to do a video on the method I use to remove those annoying injector connectors.

 

[Wild Turkey]

That is an awesome vid Chris and it explains the operation of those clips so well! Once you've seen one off the injector, it's clear, but your video will be perfect for someone who hasn't done it before. Only -ve is how amateurish it makes my video look.

While I don't have picks like that, I will say that, on my 1995, I found it very easy to just remove the top fuel rail before disconnecting the electrical connectors; I then removed the injectors from the manifold individually. With the injector just anchored by the electrical connector, it's fairly easy to use a small slot screwdriver to pop the clip to the "disengaged" position.

Have you considered a career in dentistry with your adeptness with those picks?

 

[TyraNSX]

Got any close up pictures of an injector out with the o rings showing which ones go where?

 

[AvroPac]

I just reinstalled my injectors yesterday after having them cleaned by RC Injectors. I didn’t take any pictures, but here is a crude diagram with the old parts returned from RC. In the ‘91 service manual reference pages 11-89, 11-92, and 11-93.

 

[Wild Turkey]

Watch around 7:57 in the video: Not sure if it applies to pre-1997, but my injectors came back from RC with a green o-ring on the top (fuel rail) and a black o-ring on the bottom (manifold) if that helps.

RC replaced 5 parts for me, the upper and lower o-rings, the upper and lower cushion rings, and the top filter.

Looking at amayama's parts diagram:

Fuel rail for Honda NSX 1 generation 09.1990 - 11.2001 - Honda Car and Auto Spare Parts - Genuine Online Car Parts Catalogue - Amayama

Fuel rail for Honda NSX 1 generation 09.1990 - 11.2001. Buy OEM spare parts online. Low prices, proven reliability, fast shipping from Japan

www.amayama.com

It looks like the top one is O-RING 7.3X2.2, 91304PR7A51

Honda 91304-PR7-A51 (91304PR7A51) O-RING 7.3X2.2

Honda 91304-PR7-A51 (91304PR7A51) O-RING 7.3X2.2. New & genuine Japanese car parts. Fast shipping. Low prices. Request a quote from Amayama Trading Co. online.

www.amayama.com

It looks like the bottom one is: O-RING 10X1.7, 91302P0AA00

Honda 91302-P0A-A00 (91302P0AA00) O-RING 10X1.7

Honda 91302-P0A-A00 (91302P0AA00) O-RING 10X1.7. New & genuine Japanese car parts. Fast shipping. Low prices. Request a quote from Amayama Trading Co. online.

www.amayama.com

Check your year, but you should be able to measure the o-rings?

 

[Chris_Lum]

Here are pics of mine when I took them off. The only part not pictured is the spacer or whatever it’s called, lowest “O ring” type thing that sits in the manifold. Mine was very plasticky feeling (not sure if it’s supposed to be like that or if it’s cooked rubber/silicon material).

 

[TyraNSX]

Does this look correct? I had one that was bad. Acura dealer wouldn't let me send them out so I was forced to pay & wait for a new one. Sent old one to RC. Was barely working, now all fixed up so I am saving it as a spare.

 

[Honcho]

View attachment 190709
Here are pics of mine when I took them off. The only part not pictured is the spacer or whatever it’s called, lowest “O ring” type thing that sits in the manifold. Mine was very plasticky feeling (not sure if it’s supposed to be like that or if it’s cooked rubber/silicon material).

The OEM injectors use two lower seals. The top one is a soft rubber ring that provides a seal. The bottom one is a phenolic washer that is designed as a spacer to place the injector pintle nozzle in the correct position for fuel atomization and also insulate the injector from engine block heat (there are phenolic spacers on the fuel rail as well that are made from the same material and serve the same thermal insulating purpose). Most people when they change them don't realize the two rings are different, since the rubber is usually hardened and crusty and feels just like the plastic washer. You only need to replace the rubber ones- the phenolic ones can be re-used.

 

[Honcho]

Does this look correct? I had one that was bad. Acura dealer wouldn't let me send them out so I was forced to pay & wait for a new one. Sent old one to RC. Was barely working, now all fixed up so I am saving it as a spare.
View attachment 190869

Yes that is correct. You are just missing the phenolic washer that goes below that thick rubber ring on the bottom. You need to re-use your old ones.

 

[TyraNSX]

Yes that is correct. You are just missing the phenolic washer that goes below that thick rubber ring on the bottom. You need to re-use your old ones.

I didn't take them out, the mechanic at the Acura dealer did. Presumably it is on the new injector or in the intake port. Does any of these look like the one you are talking about?