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Vince's TBI woes, progressive revelations, and tbi mods.

Discussion in 'TBI & EFI Conversions' started by Vbb199, Oct 21, 2020.

  1. 82sbshortbed

    82sbshortbed Fuckemall!!

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  2. AuroraGirl

    AuroraGirl Supporting Member Supporting Member

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    you think ignition? high possibility, heat is killer to those.
     
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  3. Vbb199

    Vbb199 B-rate Hillbilly Customs

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    333,000 miles also has a tendency to wear one out.
     
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  4. 1987 GMC Jimmy

    1987 GMC Jimmy Automobile Hoarder

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    I would still keep the OEM off to the side and rebuild it for later. I have a Spectra one, and they’re solid, but it’s not as stoutly built as OEM. Plus, those non-OEM ignition modules and pickup coils don’t exactly have a reputation for excellence.
     
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  5. Vbb199

    Vbb199 B-rate Hillbilly Customs

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    Thats what ive understood, namely the modules. My last module quit and i just tossed in another from a OEM dist.
     
  6. shiftpro

    shiftpro Full Access Member

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    Accel, wow high performance is what comes to mind. Junk from China is the reality. I had one go for a crap after a few years of use. The
    mechanical advance broke a weight pin off. I also noticed the vacuum advance was beginning to stick, not returning and therefore my static timing was too high. This engine was on propane so I didn't notice any pinging... would have been more obvious I think with a gas engine.
     
  7. Rusty Nail

    Rusty Nail Re-Re-Elect TRUMP 2024

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    1st thought - fuel filter
    2nd thought - knock sensor/timing advance (module)
     
  8. Vbb199

    Vbb199 B-rate Hillbilly Customs

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    Fuel filter and knock sensor replaced not long ago.


    esc module however could be going bad tho

    Knock sensor was causing timing issues like, 3 months ago.

    Wasnt functioning at all when the ECM did its self test, causing it to go into just...."base timing" mode.... i replaced that bad boy .
     
    Last edited: Oct 23, 2020
  9. Vbb199

    Vbb199 B-rate Hillbilly Customs

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    I appreciate the input on those.
     
  10. Vbb199

    Vbb199 B-rate Hillbilly Customs

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    Ill swap out ESC's this evening with the 2 spares i have and see if anything changes.


    Dont see how considering it just advances timing, but ill try.
     
  11. Rusty Nail

    Rusty Nail Re-Re-Elect TRUMP 2024

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    More correctly my first thought was fuel filter
    Second was ignition module but it seems unlikely
    The third thought is knock sensor...hear me out yo.
    ....I wager since it has been performing acceptably well throughout the warm summer months, the change now has been brought about by the change to winter blend fuels.

    This happens and is reality, the gas fornula changes. Furthermore, in effort to fix cars on the internet for NOTHING I vote you simple unscrew the knock sensor a turn or two..to desensitize it and post the results.
    If it were the module, it would do it it every gear, not only top gear.

    I bet if you take a turn out of the knock sensor that'll fix it.

    No problem. ;) Boom! Fixed.
    :waytogo:

     
    Last edited: Oct 23, 2020
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  12. Vbb199

    Vbb199 B-rate Hillbilly Customs

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    Im willing to try that, i know theres a torque spec, im just unsure of what it is.

    I didnt give it any ugga dugga's
     
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  13. Rusty Nail

    Rusty Nail Re-Re-Elect TRUMP 2024

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    It'll work - if that's the issue.

    They'll only go in so far, if you bottomed it out? Thats probably why and how it will work.
    Your next option is to retard the base timing.

    When hotrodding (i.e. nitrous tuning) I learned that one could use teflon tape on the knock sensor thread to further desensitize them if necessary. I have since applied Perma-Tex brush-on gasket sealer to those threads in my IROC for example, to achieve that desired result.
    I dont know the torque spec but for guys like us, it really only needs to be in far enough to stop the oil leaking - hence the gasket sealer.

    Thats my opinion based in experience and THIS IS the internet...

    :deal:
     
  14. Vbb199

    Vbb199 B-rate Hillbilly Customs

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    I do appreciate the input, i know how the sensor works, but i didnt give thought into screwing it in too far and it detecting minor issues ..


    Good stuff to know.
     
  15. jake wells

    jake wells ready for end times

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    A worn distributor drive gear can cause these problems as well.
     
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