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Thread: 7427 install, first impressions

  1. #46
    Super Moderator Six_Shooter's Avatar
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    Re: 7427 install, first impressions

    Odd, mine was the opposite.

    I ended up going to a DRAC anyway, because of the 4L60E that eventually went in the truck.
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  2. #47
    Fuel Injected! JeepsAndGuns's Avatar
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    Re: 7427 install, first impressions

    If your running a 4L60E, I would assume your using the 0D code mask? I am running a 454 manual trans bin that uses the 0E code mask. Could this be the diffrence?
    79 Jeep Cherokee, AMC 401, T-18 manual trans, hydroboost, 16197427 MPFI system---the toy

    93 Jeep YJ Wrangler, 4.0L, 5 speed, 8.8 rear, homebrew hub conversion and big brakes, hydroboost, 2.5in OME lift, 31x10.50's---the daily driver

    99 Jeep WJ Grand Cherokee limited, 4.0L, auto, 2wd, leather and power everything, 99% stock---the long distance highway ride.

  3. #48
    Super Moderator Six_Shooter's Avatar
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    Re: 7427 install, first impressions

    Possibly...

    I thought you were using $0D....

    I'll look at $0E stuff from now on in regards to this thread. lol
    The man who says something is impossible, is usually interrupted by the man doing it.

  4. #49
    RIP EagleMark's Avatar
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    Re: 7427 install, first impressions

    Is'nt $OE really for 4L80E? and $OD for 4L60E? I think they can do both but something somewhere made me think this?

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  5. #50
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    Re: 7427 install, first impressions

    There are some pretty significant differences between 60E and 80E control strategies. The ecmguy hacs don't list any $0E cals for a 4L60E or any $0D cals for an 80E so with no further info I'd bet they are trans specific. Now there's also the $E6 cal for the '8625 which was superceded to the 7427. That cal was designed to work with the E and non-E version of the 4L60 trans. And there's the $63 which was used in the 7427 in an exported vehicle (you have to be curious about why GM used a different code mask for an exported vehicle!) That cal is also for E, non E, and manual trans vehicles.

    With the different mask id's available, the only way to be sure a specific cal uses a specific pin is to have the wiring diagram available. I may be able to dig out a few diagrams if needed, as long as there's no rush. :)

    Oh, and DRAC info attached (finally)
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  6. #51
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    Re: 7427 install, first impressions

    OK I'm curious why a seperate mask for export? Only because I have an LT1 and there was an export LT1, same PCM and mask, that had pipes available from chevy with no cats. But they came with O2 sensors AND ran open loop!!! Got a bin file from a guy in Dubai, car has O2 sensors, all turned off in bin! Now how does that make sense? Two heated O2 sensors in a car running open loop AND leaded fuel!!!

    Back on topic... isn't the $85 the same PCM as all these we are talking about here? Man GM was going nuts back then with all same/simalar PCM and so many masks. Why?

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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  7. #52
    Super Moderator Six_Shooter's Avatar
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    Re: 7427 install, first impressions

    $85 was used the 16147060 PCM. Not an easy PCM to find. A friend of mine has one installed in his '71 Cutlass, with a quad 4 bbl throttle body (pictures are posted elsewhere on this site), and a 4L80E. AFAIK, they were only used or at least mainly used on the 454/4L80E pick-ups and maybe some of the heavy trucks that had the same driveline, in '92/'93.

    The 16147060 PCM has 2 brown connectors that are more reminiscent of the 1227747. Bins are only 32Kb in size, compared to the 64Kb bins of the 16197427.

    I have a sorted $85 XDF, that I need to make sure is as complete as possible, and then will upload with the new organization.
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  8. #53
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    Re: 7427 install, first impressions

    There's a guy on CK5 with a $85 I and dave are helping... and I just won an auction for harness and PCM I'm pretty sure was $85 for cheap, I thought the plugs were the same as 427... I may just wire new 427 plugs on it? There's no ADX for that mask on TP? Thanks for the info!

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  9. #54
    Super Moderator Six_Shooter's Avatar
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    Re: 7427 install, first impressions

    I also have a decent ADX. I started with one that is on moates IIRC, or maybe it was an ADS. I've added a dashboard or two to it. I can send that to you.

    No, the plugs are definitely different between the '7060, and '7427.
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  10. #55
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    Re: 7427 install, first impressions

    Since you have a XDF and ADX I would probably just build this PCM harness into something simple.

    Is the chip a memcal or chip like 7747? Sounds like an odd PCM but others make it run fine...

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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  11. #56
    Fuel Injected! JeepsAndGuns's Avatar
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    Re: 7427 install, first impressions

    And what about the $31 code mask? I have two 7427 pcm's I got from the local pull a part and both had the same BCC witch came up as $31 code mask. One was in a 3500 dually, not sure what engine, as it was already gone, but I think a 350, cause thats what the BCC comes up as. The other pcm came out of a 95 chevy van 30. (full size van, no windows)
    Soo many code masks for the same pcm. Its kinda confusing.
    79 Jeep Cherokee, AMC 401, T-18 manual trans, hydroboost, 16197427 MPFI system---the toy

    93 Jeep YJ Wrangler, 4.0L, 5 speed, 8.8 rear, homebrew hub conversion and big brakes, hydroboost, 2.5in OME lift, 31x10.50's---the daily driver

    99 Jeep WJ Grand Cherokee limited, 4.0L, auto, 2wd, leather and power everything, 99% stock---the long distance highway ride.

  12. #57
    RIP EagleMark's Avatar
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    Re: 7427 install, first impressions

    I agree. But $31 XDF and ADX are available at TunerPro.

    That brings up a question? If you have one of these $OE can you use $OD or if $31 can you use $OE?

    I beleive I already went from $OD to $OE on this 427 and it runs fine on my test bench.

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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  13. #58
    Super Moderator Six_Shooter's Avatar
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    Re: 7427 install, first impressions

    The '7060 is a MEMCAL.

    You can swap between code masks with the '7427, as long as it was used in that PCM.

    I have some info on $31, but it doesn't seem to be any where near as popular as $0D and $0E.
    The man who says something is impossible, is usually interrupted by the man doing it.

  14. #59
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    Re: 7427 install, first impressions

    I don't know why GM made a different cal for export. I have a few export cals and the differences are usually related to leaded fuel (O2's and closed loop disabled, cat converter models different) or speed limiters (none in the cal I've got.)

    I believe I have a def file (not TP) for $31. Does anyone know of a handy utility to convert a non-TP def to TP?? And if ecmguy released a hac, I probably have that also. You can swap between cals if they're intended for the same pcm but you need to check the wiring diagrams because GM sometimes makes subtle changes to the input / output functions. It makes more sense to me to make one pcm and a million different masks than to make a million different ecm's and only one or maybe two masks for that pcm.

  15. #60
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    Re: 7427 install, first impressions

    But why not one PCM and one mask? Seems like $OE can do 4l60e, 4l80e, 700r4 and manual IIRC looking through the mask. Maybe GM had multiple teams working on and sharing simalar PCMs and tech? Or... I just can't figure why, but I am simple and GM is complex, and has to comply with EPA...

    EDIT: In looking at $OE it does have bins and paremeters for manual and controls and Auto 4l80E and 700R4. But does not have 4L60E.

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

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