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As can clearly be seen in the picture, the injectors on my 98 Mazda 626 2L GF are different colors:

enter image description here

This is even mentioned in the official Workshop Service Manual:

enter image description here

However, both according to the manual and my tests, all the injectors have the same flow rate; about 56-61ml when held open for 15 seconds.

The issue is that I may need to replace my injectors, yet when I look on Rockauto, all the injectors seem to be sold individually, and all the ads recommend replacing them as a set, yet with no mention of color.

So what is the significance of the color, and as a bonus, how can I order replacement injectors if no mention of color is made on any of the injectors being sold?

  • This is the crazy mixed up world of Ford/Mazda! :o) Really, I have no clue. – Pᴀᴜʟsᴛᴇʀ2 Jan 3 '17 at 15:05
  • @Pᴀᴜʟsᴛᴇʀ2 Could it be something like the spray angle? I really don't want to buy a set of four injectors and then have a problem. – Robert S. Barnes Jan 3 '17 at 15:16
  • So far I've found someone saying the color isn't significant, and is only for user friendliness when hooking them up: mazdas247.com/forum/… – Robert S. Barnes Jan 4 '17 at 19:52
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So I e-mailed Rockauto about the injector color issue and this is what they said:

Hello,

All of the information we have on the products we sell is listed on our website. Please see our Help page: Choosing a Part.

If you're not seeing the details you are looking for, we do not have them. That also means they are not important for fitment. The manufacturer always lists the details that will be important to determine if the part will fit your vehicle.

Thank you,

Dave B. RockAuto Customer Service

I also found this post while searching around on the internet:

The injectors operate in banks driven by the pulses on the same timing as the two coils. They are color coded so that the wires that feed them will never be hooked up incorectly. If they get mismatched the fuel will come out at the wrong time in the firing sequence.

So if you buy new injectors are they going to be different colors too?

if you buy, OEM replacements yes.

if you buy aftermarket injectors from a company like RC, they won't be.

they are only color coded by mazda so that its more user friendly to hookup.

Between the two, I'm going to say that the color must not make any difference and is just some kind of convenience thing.

EDIT Feb. 5th 2017

Apparently, the 626 sold in North America, and the one sold in the rest of the world use completely different injectors, and probably a different manifold as well since the US injector is way fatter than the European one:

enter image description here

So I'm having to RMA the injectors I ordered and look for an exact fit.

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If you are replacing ALL, the color won't matter. If you are only replacing one or some, the color must match those already in the vehicle.

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