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I have four hole injectors like this on my 98 Mazda 626 2L GF:

enter image description here

What does the proper spray pattern for this type of injector look like?

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Basically, the spray pattern should be conical and even, without streaming, dripping, or uneven spray occurring. This ensures the fuel is atomizing as much as possible. Here is a granular image which shows what a multi-port injector (like yours) should look like:

enter image description here

You should be looking at 3rd from the left.

From your image on the other question, I'm not necessarily seeing any suspect spray patterns. After you clean the injectors, any deviance in the spray patterns should be cleaned up.

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