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  1. Thread: Strange Issue

    by Fast355
    Replies
    18
    Views
    352

    The ECU has nothing to do with the engine...

    The ECU has nothing to do with the engine cranking over. That is a function of thr VATS module and starter relay.
  2. Thread: Strange Issue

    by Fast355
    Replies
    18
    Views
    352

    How can it be closer to a L05? It either has a...

    How can it be closer to a L05? It either has a 305 or a 350.

    That being said, cap and rotor, especially the rotor ar suspects. If the rotor has burned through, the spark is grounding out on the...
  3. Replies
    17
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    726

    For retrofits, hard to dismiss Holleys excellent...

    For retrofits, hard to dismiss Holleys excellent Hydramat product. Had I not looked at a Dorman tank that had a massive baffled area added to it for the G-vans, I would have used a Hydramat for it....
  4. Replies
    7
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    292

    A 2bbl feeds 2 cylinders on each bank from each...

    A 2bbl feeds 2 cylinders on each bank from each bore. Some of the TBI manifolds (Edelbrock 3704, GM performance, stock L31 TBI and marine TBI L31) and carb manifolds used with TBI have the cylinders...
  5. Replies
    17
    Views
    726

    Having worked on and driven both the OEM GM TBI...

    Having worked on and driven both the OEM GM TBI and long runner MPFI 250 I6 engines, find a later MPFI intake for a 4.0L and swap to MPFI. The TBI is a good system, but it still has the same issues...
  6. Replies
    9
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    269

    Sure it is getting a reference pulse from the...

    Sure it is getting a reference pulse from the ignition control module. The module can fail, still provide a spark and not send a reference pulse to the ECM. Wiring between the distributor and ECM can...
  7. This exhaust matches the open loop only catless...

    This exhaust matches the open loop only catless L31. My 2003 L31/5spd 4x4 GMT800 Sonora had the same type of setup but did use front 02s only. Factory EGR deleted, LS truck airbox and 85mm MAF on...
  8. Factory exhaust and 02 configuration on a single...

    Factory exhaust and 02 configuration on a single catalyst Vortec. 3 pre-cat 02s. An 02 after each manifold and 1 after the Y-pipe. 1 behind the cat.
  9. Incorrect, 3 upstreams on the factory single cat...

    Incorrect, 3 upstreams on the factory single cat trucks. It very much does change how the engine runs.

    GM has factory Express van tunes for L31s with a single cat as well as no cats and even no...
  10. Replies
    5
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    415

    Kickdown mode shifting is activated by a TPS...

    Kickdown mode shifting is activated by a TPS value and hyperstasis value. Usually at some point above ~90% TPS. The kickdown tables are usually a high and low value for each gear. If you have a...
  11. Replies
    22
    Views
    2,630

    Ducting arrived today, re-tested with the full...

    Ducting arrived today, re-tested with the full lengths of 4" ducting. It will be cut to proper length when it is fitted.

    https://youtu.be/s6MIf4ckeAE?si=JnvdC8_HneXgL0L5
  12. Replies
    22
    Views
    2,630

    I do like keeping things under cover as much as...

    I do like keeping things under cover as much as possible.

    Tested the ram air function earlier with the filter in place. With two scoops in place should be even more effective.
    ...
  13. Replies
    13
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    539

    TunerProRT and an XDF exported from Universal...

    TunerProRT and an XDF exported from Universal Patcher.
  14. Replies
    13
    Views
    539

    WAG for me tuning my P59 for my L31 style 383...

    WAG for me tuning my P59 for my L31 style 383 with s marine manifold.

    Best thing I can say is mine mostly needed Throttle Stomp Compensation although it did nee aome additional boil time and...
  15. Replies
    22
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    2,630

    Thank You

    Thank You
  16. Replies
    22
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    2,630

    I found a NOS, discontinued Spectre air cleaner...

    I found a NOS, discontinued Spectre air cleaner housing I have had my eyes on. $250 at Summit when Spectre last offered it for $150 on Ebay and it comes with the re-useable 14x4 air cleaner. Seller...
  17. Replies
    22
    Views
    2,630

    Thanks and they do. Bit of a mystery why long...

    Thanks and they do. Bit of a mystery why long terms and short terms are as far off as they are, but they are correcting in opposite directions and the actual air/fuel ratio is close to the commanded,...
  18. Replies
    22
    Views
    2,630

    Put a 145 amp AD244 on it and wired it up....

    Put a 145 amp AD244 on it and wired it up. Charges perfectly now. 14.5 on a cold start and settles down around 13.8-14.0 when it is hot.
  19. Replies
    6
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    568

    I have a couple of OE marine or industrial...

    I have a couple of OE marine or industrial designs as well. One to a 2bbl 2GC pattern and a 2nd to a 4150 4bbl pattern. The 2 bbl has an open center, the 4bbl is divided with ridges machined into it...
  20. Thread: 1228330 Mask

    by Fast355
    Replies
    10
    Views
    1,043

    This is only for the 307 version of this ECM....

    This is only for the 307 version of this ECM. 305/350 was coded differently despite the same ECM number. Attached both a XDF and ECU file as well as a stock BIN. Everything should be functional...
  21. Replies
    22
    Views
    2,630

    I need to replace the alternator and finish...

    I need to replace the alternator and finish wiring it up.
  22. Replies
    22
    Views
    2,630

    Pulled it out of the shop and made a brief test...

    Pulled it out of the shop and made a brief test drive. Running well enough already that it stalls the OE TH400 converter ~2,500 rpm and hazes the right rear P275/60R15 even with the 3.08 gear lol.
  23. Replies
    22
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    2,630

    https://youtube.com/shorts/pJWi1-9njU8?si=eZCuuTd-...

    https://youtube.com/shorts/pJWi1-9njU8?si=eZCuuTd-YbIcK6MR
  24. Replies
    22
    Views
    2,630

    Just thought I would add it does run fully on its...

    Just thought I would add it does run fully on its own fuel system now, TBI tank &sending unit with a vortec pump.. It literally started very quickly and easily considering the timing was a bit...
  25. Replies
    19
    Views
    1,594

    That 51 has to be a random glitch in the data. ...

    That 51 has to be a random glitch in the data. That is well outside the limit of the BLM adjustment possible in the ECM.

    The trend I do see is overall it is lean.

    I datalogged these old ECMs...
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