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6.2L vin's: C or J

Discussion in '1982-Present GM Diesel' started by fbronson, Jan 20, 2005.

  1. fbronson

    fbronson 1/2 ton status

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    Here's a trivia question for the sages of the diesel page: Do I have a C or J 6.2L and How do I find out? What is the difference anyhow?
    Next question: I need to replace my fuel injection pump :frown1: and I am curious where the best place to get a pump is. And secondly, I discovered that there are both low and high altitude pumps available. My Blazer originally came from Maine, but now lives in Denver. Should I put a high altitude pump into it, or stick with the original equiment (I am assuming it originally came with the low altitude pump)?
    Thanks for the help!:thumb:

    Fred
     
  2. big_truxx

    big_truxx 1/2 ton status

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    is it the original engine for the truck? if so will be a j in the vin #. also I'm from Maine!!! :waytogo: dunno why that's so exciting... oh yeah I have no life :grin:
     
  3. fbronson

    fbronson 1/2 ton status

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    No, the engine currently in the truck is a rebuilt unit that was put in it about 75 to 80,000 miles ago.:thinking: So I am not entirely sure what the engine originally came out of. If memory serves me correctly (ha ha, like that'll every happen! :laugh: ) the engine was originally out of an early 90's vehicle. I have no idea what difference that would make. But do you know where to find that VIN? Should be on the block somewhere, right?:dunno:
     
  4. 82dieselburb

    82dieselburb 1/2 ton status

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    If your engine has a ERG valve on the intake it is a C code.If it has no ERG it is a J code.
    As far as your IP pump I would call Timatwww.accuratediesel.com.He rebuilt mine and is very helpful.I haven't heard of high and low altitude pumps,but I'm sure he can rebuild your pump for your specific application.
     
  5. big_truxx

    big_truxx 1/2 ton status

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    I think there is also a J stamped on the block on the driver's side towards the rear. Maybe merely coincidence but I noticed my J code had one.
     
  6. fbronson

    fbronson 1/2 ton status

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    I'll take a look to see if I can figure out whether it is a C or J code today. Thanks for the info!:thumb: So you actually had somebody rebuild your pump? How much did it cost you, if you don't mind me asking? I am not too thrilled about the idea of spending close to $400 for a rebuilt pump from NAPA or Auto Zone. :mad:
     
  7. muddog

    muddog 1/2 ton status

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    hmmm...let me do some digging...there is a guy in MN that does them for 200 and will build them to whatever spec you want...guessing fuel pressure..friend just had one done this summer
     
  8. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    I sent my junk to Tim at Accuratediesel.com...got 8 injectors rebuilt as well as the injector pump. Total cost shipped to my door was $347 US.

    Well worth it, and great customer service.

    Rene
     
  9. smalltruckbigcid

    smalltruckbigcid 1/2 ton status

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    There is a guy in Rochester MN that does good work...Rochester fuel injection 507-288-8038 hes worked on my Mack pump and it did good for a reasonable price
    George
     
  10. imiceman44

    imiceman44 1 ton status

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    J code has J in the VIN as well as the engine code.
    ALso if your engine came out of a 90's, it very possible it's the one you can bore to 6.5l

    :D
     
  11. fbronson

    fbronson 1/2 ton status

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    So I poked around the engine compartment, and I think I have a J code engine. I can't find the EGR valve on the intake, but maybe I just don't know what I am looking for. I also checked on the drivers side of the block, just above the fuel filter, and it looked like it had a "J20" stamped on it. I am not 100% sure on this one though. Where would I look to find the actual vin stamped on the engine? The VIN on the tag up by the drivers side of the windshield has a C in it.
     
  12. big_truxx

    big_truxx 1/2 ton status

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    since the engine was not the original the VIN won't tell you anything. I believe that you have a j code as I did and I had that j stamped abouve the filter on the driver's side rear of the block in the same location.
     
  13. imiceman44

    imiceman44 1 ton status

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    Did you take the air cleaner off and look?
    That is where the EGR is.
     
  14. afroman006

    afroman006 1/2 ton status

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    It would be hard to miss the EGR valve, its sitting right in the middle of the intake hole and is like 4-5" in diameter.
     
  15. fbronson

    fbronson 1/2 ton status

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    So the EGR sits right in the middle of the intake? yeah, there is a goofy little thing at the center of the airfilter. Once the airfilter cover is removed you can see it right there. I guess I would really like to know where the VIN is stamped on the block. This would tell me for sure whether it is a J or C code, right? One thing that I am still curious about, however, is what is the difference between the two? I have heard that the J code engines have slightly larger valves. Is this true? When I go to autozone, are there any parts that I should be aware of that are different between the two?
     
  16. BlueBlazer

    BlueBlazer 1/2 ton status

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    It's a C code. EGR and a lower fuel calibration on the pump. Maybe some internal engine differences, but I do not know.
     
  17. fbronson

    fbronson 1/2 ton status

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    Thanks for all the info guys. :thumb: Well, my injection pump is on its way to Tim at Accurate Diesel. Hopefully it will be in much better shape when it comes back! I decided to take the oportunity to do a full rebuild :doah: . So my engine has now been stripped down to the block! Yeah, I'm a little crazy! I've taken some decent photos along the way (to help me remember how is all supposed to fit back together!), and I'd be happy to do a write up if anyone is interested:dunno: . The intake manifold on it is definitely a C code, as it includes the EGR valve. However, it wasn't hooked up to anything, so it is obviously useless. Man, those heads weigh a ton!
     

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