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Thread: Identifying a Fuel Injector by Case Numbers

  1. #1
    Carb and Points!
    Join Date
    Apr 2015

    Identifying a Fuel Injector by Case Numbers

    What are the case numbers on a fuel injector telling me?

    Can I get a part number from the case numbers?

    Hello: I'm working on a 1995 C2500 with throttle body injection. One of the injectors is bad. I've learned it is a rebuilder. The PCM number is for a 4.3 6-cylinder, but it is an eight cylinder engine. The eighth VIN is an 'N' for a 7.4L.

    The numbers on the case are RI-694 and 2320. The 'eye' may be a 'one.'

    The injectors I've tried by application don't work. I've swapped ports and know that one good matching injector will fix the problem.

    I've spent over two hours doing google searches and haven't been able to identify a correct part number for the working injector that I already have. I have learned that different manufacturers have the same numbers stamped on injectors for the same application. I'm thinking these numbers are an ISO or ASE identification? All I really need to know is the correct replacement part number, but

    I'm really curious now. What are these case numbers telling me? Do any of the manufacturers or anyone else have cross reference tables?

    While doing my google searches, I found a lot of people asking for injector identification based on these case numbers. I think this information would find good use for many others as well as myself.

    Thanks all. JB
    Last edited by NAE; 04-18-2015 at 08:09 AM. Reason: Formatting Problem

  2. #2
    Carb and Points!
    Join Date
    Apr 2015
    Had a formatting problem.
    Last edited by NAE; 04-18-2015 at 08:11 AM.

  3. #3
    Fuel Injected!
    Join Date
    Jul 2012
    Fresno, CA
    The PCM number won't actually tell you what size engine it's for. There's a four letter code on for the MEMCAL (chip) inside that is engine/trans specific(it's also usually on the PCM label). The '94-95 7.4 used a much higher fuel pressure than the '93 and earlier, so you do need to make sure that you have the correct fuel pressure (I think it's around 29psi, but not sure off the top of my head) and that the injectors are correct for your year. The injector number you referenced is for an aftermarket injector and I don't know for sure what flow rate that one is (it isn't an ASE or ISO #). The stock injectors for your application should be #17104288.

    What exactly is the problem you're having? Is the injector just not firing? You might be best off getting a matched set rather than trying to find one to match the other that you have as there are flow differences even between injectors with the same part number.
    1973 K-5 Blazer, TBI 350, TH400, 1 ton axles & 38" SSRs'
    1975 280Z, TBI 350, 700R4
    1953 M-38A1, TBI Buick 231
    1951 Ford Panel, 5.3 with 4L80E

  4. #4
    Fuel Injected! brian617's Avatar
    Join Date
    Apr 2013
    Good accurate TBI injector info here
    89 K1500 Scottsdale 5.7L 5spd 3:42

    Build specs: 97 4 bolt main block 350ci, Eagle rotating assembly with flat tops and 4 valve reliefs, Dart 165cc/67cc Iron Eagle heads, Manely SS valves and springs 110lbs seat @1.7, GM Ram Jet cam 196/206 @.50 .431/.451, stock intake and throttle body, heads and intake gasket matched, Delco EP377 fuel pump @ 22 psi, 427 PCM.

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