New ID725CC injectors - fuel rail not sitting flush... WTF? SOLVED!
 

Hi,

it's days like these that make me sometimes wish I would have a non-DIY car...

I installed my new ID 725CC injectors today, but my fuel rail is not sitting flush on the "bosses" (?) when I install it. See attached pictures...

I installed the spacers at the fuel rail - but when I tighten the rail, the rail just goes flush on the top of the holding boss, not at the bottom, there are ~2mm missing... WTF? All the injectors are properly seated...

Please help me out - what could I possibly be doing wrong?

Did anyone else have this problem?

Car is a B6 with DIY Dual-feed fuel rail...

https://www.miataturbo.net/attachmen...ine=1348306268

See the angle at which the fuel rail is sitting:
https://www.miataturbo.net/attachmen...ine=1348306268

Injectors:
https://www.miataturbo.net/attachmen...ine=1348306268

https://www.miataturbo.net/attachmen...ine=1348306268

https://www.miataturbo.net/attachmen...ine=1348306268

https://www.miataturbo.net/attachmen...ine=1348306268

:vash::vash::vash:

Who did you buy them from?

949racing

Are the rail spacer thingies on the head the same size as the 1.8 American spacers?

Can you rotate the injectors freely? Can you not push it flat by hand? Do you have a caliper to check the sizing against your old injectors?

Yes, I was running the 460cc Supra injectors before - no problem...
Just checked at ILMotorsport - they are the same for all Miatas, NA, NB, NBFL.

Yes they rotate nicely. No I can't push it flat by hand, not even with the screws, the injectors start to tilt then between the injector body and the aluminium spacer on top.
I checked them by eye with my old 460cc RX-7 injectors and they seem to match.

lube up the gaskets on the injectors with oil and try again.

I would never try to install injectors without lubing them... Never go in dry!

Are the old o-rings still in?

Pull the injectors out and photograph the pintle ends for me (the end where fuel comes out). ID probably left the hard rubber gromets on at the ends.

I already took pictures of the injectors, but don't have them at hand atm.

But I think this could be it. There are little rubber gromets, about half the size of the rubber isolators above them. The gromets have a conical shape. I post the pics asap.
How would one get the gromets of the pintle ends? Just pull? They do look fixed on the metall...?

Thanks

I'm not sure if it is the same thing but I removed the ring on ev14s with pliers.

What method did you use to install the injectors/rail? I just installed a set yesterday on mine, I did the following:
Removed old injectors, all 3 seals came out with each of my factory injectors.
Cleaned out the manifold area where the injectors seat, there was some dust/grime buildup in each of the holes.
Put on all 3 new seals on each injector and applied liberal amounts of clean oil to each.
Slid the new injectors into the fuel rail.
Installed the fuel rail with new injectors as a unit into the manifold.
Once installed, I inspected the bottom grommet of each to insure it properly seated without pinching the rubber seal.
Rotated each injector to make sure none were binding in any manner.
Finally I snugged down the bolts to hold it in.

This is probably worthless info, but it's what I did and things are working great for me with no leaks.

I was a little surprised how obnoxious the install was. Easy, but annoying. I kept thinking to myself how many curse words I'm going to use next year when I have to change back to stock for emissions inspection, then change back again once it's over. :rofl:

O.k. Injectors are in, the rubber gromets were the solution. I removed the gromets with a plier and the injectors went in as supposed...

I am going to post some pictures for future reference tomorrow.

Here are the pictures for future reference:

That is how the injectors came:

https://www.miataturbo.net/attachmen...ine=1348465059

That is with the rubber gromets removed - you still need to wiggle them a bit around to make them sit properly.

https://www.miataturbo.net/attachmen...ine=1348465059

In case somebody else has this problem...

FYI, this is only an issue if you/your vendor orders the generic ID725/ID1000s. The IDs we sell are Miata-specific and they have the gromet removed.

Well, 949racing also says they are Miata-specific... ;)

That's what we order from Tony, Miata specific. I'll mention this to him.

Hey Sav/Emilio,

Do either of you stock (or can easily order) the little blue spacer/adapter things? I have a set of Subaru ID1000's that come without them and am 99% sure they will work on a miata if I simply get the adapters.

I don't, but I think ID sells them separately.