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Thread: Installing CM-4915 injectors on my 1989

  1. #1
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    Installing CM-4915 injectors on my 1989

    Engines been sitting for about 10 years so he injectors will need rebuilding.
    Have some CM-4915 also marked XL3Z-9F593-AA units new in the box.
    Wonder what will happen if I install these?

  2. #2
    Admin ZR's Avatar
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    Don't have time to look up, do they spec out same as OE?
    If not have your stockers cleaned n call it a day.
    Have however seen em sit even longer than that and work fine.

  3. #3
    Club Sponsor Kennedy Ford SVT's Avatar
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    Those are the old Lightning 42 lb. green top injectors. CM-4915 is the Motorcraft replacement number for the XL3Z-9F593-AA Ford number, so they should be identical. Sold lots of those for upgrades back in the day when the price was cheap compared to aftermarket options.

    EDIT:

    Didn't fully read what you were trying to do. These would not be good replacements for the 19 lb./hr. factory injectors, going to 42 lb. would be for a heavily modded NA or a supercharged application
    .
    Last edited by Kennedy Ford SVT; 05-31-2022 at 02:45 PM. Reason: add info
    Kennedy Ford SVT - Oakville
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  4. #4
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    Quote Originally Posted by Kennedy Ford SVT View Post
    Those are the old Lightning 42 lb. green top injectors. CM-4915 is the Motorcraft replacement number for the XL3Z-9F593-AA Ford number, so they should be identical. Sold lots of those for upgrades back in the day when the price was cheap compared to aftermarket options.

    EDIT:

    Didn't fully read what you were trying to do. These would not be good replacements for the 19 lb./hr. factory injectors, going to 42 lb. would be for a heavily modded NA or a supercharged application
    .
    Thanks for the edit. I will look into rebuilding my old ones. Did you ever race a grey fox body with a triangle two tone paint job ?

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