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Thread: ??!! Burned Out 2 SMEC's In 10 Miles !!??

  1. #21
    Supporting Member Turbo Mopar Contributor mopar-tech's Avatar
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    Re: ??!! Burned Out 2 SMEC's In 10 Miles !!??

    Quote Originally Posted by 2.216VTurbo View Post

    Gary, how do I check for that feedback voltage you mentioned, which pin *shouldn't* have that feedback?
    I know some wideband setups will provide a "narrow band" output for stock computers, what if it is kicking out more than 0-1 volts? Watch the O2 sensor input going into the module.

    Doubt it is the issue but better to double check.


    Working on clearing the decks.

  2. #22
    boostaholic
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    Re: ??!! Burned Out 2 SMEC's In 10 Miles !!??

    Had a smec do this that was running for months then just up and quit while driving. Shut it down to pull over and any time you would turn on the car it would to the asd and tach needle mess. Replacement smec has been running fine since. No other changes to the car. Well except a new battery just after that event.

    Quote Originally Posted by A.J. View Post
    When I first started socketing boards, the first one I did caused the ASD relay to click on and off like crazy and the tach needle to jump all over the place. The Logic Module board ended up being bad. I don't know what caused it, my technique in removing the chip, static electricity, who knows. There's been other times I'd burn a chip and the data getting corrupt and causing the same issue. If the ASD relay is clicking I'd say you have a bad Logic Module this time or a bad chip.

  3. #23
    Moderator Turbo Mopar Staff Force Fed Mopar's Avatar
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    Re: ??!! Burned Out 2 SMEC's In 10 Miles !!??

    Bad chip or chip connection might do it. Try removing and reinstalling the chip.
    Rob M.
    '89 Turbo GTC

    2.5 TIII stroker, 568 w/ OBX and 3.77 FD

  4. #24
    Supporting Member Turbo Mopar Contributor 2.216VTurbo's Avatar
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    Re: ??!! Burned Out 2 SMEC's In 10 Miles !!??

    I guess I'm pulling the battery, and the SMEC-again May as well add another ground strap to the fuel rail as well.

    AJ (no More Alan) 84 Rampage RT TIII/568 Quaife 87 GLHS dealer optioned Red 16V Masi/568/Quaife
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  5. #25
    Boost, it's what's for dinner... Turbo Mopar Staff Aries_Turbo's Avatar
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    Re: ??!! Burned Out 2 SMEC's In 10 Miles !!??

    Quote Originally Posted by 2.216VTurbo View Post

    Brian the shoulder blade thing is called subscapular pain, classic spinal stenosis/herniated disc symptom.
    The lower back is a herniated disc. I've seen my mri from 2013. That's manageable with proper low back support and posture.

    This new one is weird. It's manageable too but if i hold something out in front of me with my left hand I can feel the muscles right next to my spine on the left side fall asleep.

    If I lean forward slightly as if to wash dishes or something, both sides begin to hurt and the muscles knot up. Somethings getting pinched

    Brian

    Quote Originally Posted by turbovanman
    This one is easy, I have myself to blame, I rush things, don't pay attention to gauges when I should, change to much stuff at once then expect miracles, the list is endless.

  6. #26
    Hybrid booster Turbo Mopar Contributor
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    Re: ??!! Burned Out 2 SMEC's In 10 Miles !!??

    Quote Originally Posted by 2.216VTurbo View Post
    No Fx, just old man spine with degenerative changes

    So If I am gonna just add a chassis ground to the SMEC, which pin/color wire should should I tap into?

    There is a lotta red paint under the main negative cable ground under the batt tray so I'm gonna make it clean and shiny like Gus always said to
    Adding a second chassis ground for the SMEC is a bad idea for reasons I said in my first post. The ASD relay clicking does sound like a bad ground. Try back probing your grounds with a test light to trouble shoot.
    [SIGPIC][/SIGPIC] 86 Daytona Turbo Z C/S with a full 89 Shelby swap, back on the road and soon to be painted (and lose that Oggie Fisher black) 83 Porsche 944, 5 speed, all stock. 2014 Toyota Tacoma 4x4, 5 speed, daily driver. 2017 Trek 1.2 bicycle.

  7. #27
    Garrett booster
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    Re: ??!! Burned Out 2 SMEC's In 10 Miles !!??

    Stupid question but are you getting any codes out of the SMEC???


    Sent from my iPhone using Tapatalk

  8. #28
    Supporting Member II Turbo Mopar Contributor A.J.'s Avatar
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    Re: ??!! Burned Out 2 SMEC's In 10 Miles !!??

    Quote Originally Posted by mock_glh View Post
    As for the injectors, our systems run low impedance. Hi impedance injectors are easier on the drivers and will run just fine.
    How is running more resistance on a circuit easier on the drivers? I've never heard this before.

  9. #29
    Moderator Turbo Mopar Staff Vigo's Avatar
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    Re: ??!! Burned Out 2 SMEC's In 10 Miles !!??

    Because it lowers current given the same voltage according to ohms law. So less heat.

    Dont push the red button.You hear me?

  10. #30
    Supporting Member Turbo Mopar Contributor 2.216VTurbo's Avatar
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    Re: ??!! Burned Out 2 SMEC's In 10 Miles !!??

    Quote Originally Posted by marc View Post
    Adding a second chassis ground for the SMEC is a bad idea for reasons I said in my first post. The ASD relay clicking does sound like a bad ground. Try back probing your grounds with a test light to trouble shoot.
    OK, I went back and reread all posts, I missed that part of your first Marc(Vicodin helps the pain but not great for clear thoughts) I should be able to dig in with and confirm the grounds and other tips here in the next hour or so. Pathetic part is if I get it running tonight, I can't even drive it with the meds and inabililty to work the 568

    Thanks to everyone that chimed in

    AJ (no More Alan) 84 Rampage RT TIII/568 Quaife 87 GLHS dealer optioned Red 16V Masi/568/Quaife
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  11. #31
    Supporting Member Turbo Mopar Contributor 2.216VTurbo's Avatar
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    Re: ??!! Burned Out 2 SMEC's In 10 Miles !!??

    Turns out powder coated fuel rails look awesome! But don't act as much of a good ground. Removed the ground, scraped a little of the pretty black coating, reinstalled the bolt, fired right up. To bad it's too late to rescue that other power module board from the outgoing trash. Oh well. Curious how RedBox made it 1900 miles before said ground didn't conduct negative electrons...

    AJ (no More Alan) 84 Rampage RT TIII/568 Quaife 87 GLHS dealer optioned Red 16V Masi/568/Quaife
    90 Masi 16V White/Ginger/Black
    89 TC Masi 16V Red/Ginger/Black
    86 GLHS #110 RoadRace Built 89 CSX-VNT Recaro Car
    89 Turbo Mini 'Woody' 85 GLHT 'RedBox'
    2014 Explorer DD'r 3.5Twin Turbo Ecoboost AWD and 500HP
    My profile page has over 20,000 views, I'm somebody LOL

  12. #32
    Supporting Member Turbo Mopar Contributor
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    Re: ??!! Burned Out 2 SMEC's In 10 Miles !!??

    Quote Originally Posted by 2.216VTurbo View Post
    Turns out powder coated fuel rails look awesome! But don't act as much of a good ground. Removed the ground, scraped a little of the pretty black coating, reinstalled the bolt, fired right up. To bad it's too late to rescue that other power module board from the outgoing trash. Oh well. Curious how RedBox made it 1900 miles before said ground didn't conduct negative electrons...
    Great news! Could you do me a favour now that it is working and check one of your old "bad" driver boards? A bad ground on a fuel rail will not "fry" a board, in fact, a transistor acts as a switch and turns the grounds on and off to the injectors to pulse fuel. I agree that grounds are tres important but the lack of a ground on your fuel rail did not fry your board. I would guess current overload and/or lack of cooling to the board kill them, if they are dead. I assume you have no active air flow through the SMEC casing
    Regards,
    Miles

    DD '87 Sundance T1, SLH with rear disks
    '87 CSX #432 2.5 CB TII, SLH

  13. #33
    Slugmobile & MeanMini Caretaker Turbo Mopar Contributor wheming's Avatar
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    Re: ??!! Burned Out 2 SMEC's In 10 Miles !!??

    Does no one ever use those grounding star washers that bite into the metal when they ae connecting grounds wires? They are in those drawers at hardware stores. They bite down to metal through paint.
    Wayne H.

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  14. #34
    Moderator Turbo Mopar Staff Vigo's Avatar
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    Re: ??!! Burned Out 2 SMEC's In 10 Miles !!??

    I had a breakdown about 6 months ago due to that ground on my Spirit. I figured it out AFTER towing it home and felt a little dumb, but the fact that i had to figure it out just proves it was a needed refresher.

    Dont push the red button.You hear me?

  15. #35
    boostaholic
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    Re: ??!! Burned Out 2 SMEC's In 10 Miles !!??

    I replace the screws with a JL audio ground stud and then bolt the ground to that. very secure is an understatement.

    Quote Originally Posted by wheming View Post
    Does no one ever use those grounding star washers that bite into the metal when they ae connecting grounds wires? They are in those drawers at hardware stores. They bite down to metal through paint.

  16. #36
    Supporting Member Turbo Mopar Contributor
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    Re: ??!! Burned Out 2 SMEC's In 10 Miles !!??

    Quote Originally Posted by going4speed View Post
    I replace the screws with a JL audio ground stud and then bolt the ground to that. very secure is an understatement.
    Looks very serious!
    Regards,
    Miles

    DD '87 Sundance T1, SLH with rear disks
    '87 CSX #432 2.5 CB TII, SLH

  17. #37
    Supporting Member Turbo Mopar Contributor 2.216VTurbo's Avatar
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    Re: ??!! Burned Out 2 SMEC's In 10 Miles !!??

    FARK! I give up Spritz, sprayed, detailed, armor all'd tires all with just one arm working and then figured I deserved a lil test drive for my efforts. 5-6 miles into my 'test loop' around the hood, running well then dead again, no spark, no fuel, ASD clicking like mad Ugh

    AJ (no More Alan) 84 Rampage RT TIII/568 Quaife 87 GLHS dealer optioned Red 16V Masi/568/Quaife
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  18. #38
    Supporting Member Turbo Mopar Contributor 2.216VTurbo's Avatar
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    Re: ??!! Burned Out 2 SMEC's In 10 Miles !!??

    R&R'd the battery, SMEC, and chip, checked grounds, added another from firewall to other side of fuel rail with no effect. No spark/fuel and clicky clicky from ASD. Anyone have a match?

    AJ (no More Alan) 84 Rampage RT TIII/568 Quaife 87 GLHS dealer optioned Red 16V Masi/568/Quaife
    90 Masi 16V White/Ginger/Black
    89 TC Masi 16V Red/Ginger/Black
    86 GLHS #110 RoadRace Built 89 CSX-VNT Recaro Car
    89 Turbo Mini 'Woody' 85 GLHT 'RedBox'
    2014 Explorer DD'r 3.5Twin Turbo Ecoboost AWD and 500HP
    My profile page has over 20,000 views, I'm somebody LOL

  19. #39
    Supporting Member Turbo Mopar Contributor
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    Re: ??!! Burned Out 2 SMEC's In 10 Miles !!??

    Quote Originally Posted by 2.216VTurbo View Post
    R&R'd the battery, SMEC, and chip, checked grounds, added another from firewall to other side of fuel rail with no effect. No spark/fuel and clicky clicky from ASD. Anyone have a match?
    So Sorry to hear. did you have a moment to test voltages at the Pins I list above when cranking?and when the ignition is on? That will help to find the root cause
    Regards,
    Miles

    DD '87 Sundance T1, SLH with rear disks
    '87 CSX #432 2.5 CB TII, SLH

  20. #40
    Supporting Member Turbo Mopar Contributor 2.216VTurbo's Avatar
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    Re: ??!! Burned Out 2 SMEC's In 10 Miles !!??

    Quote Originally Posted by chromguy View Post
    So Sorry to hear. did you have a moment to test voltages at the Pins I list above when cranking?and when the ignition is on? That will help to find the root cause
    I didn't because I *thought* it was solved, I will tho because I'm back to square one-ish, Thanks for the suggestions. So the harness needs to be connected and during cranking to get those values you listed, and I'm checking the back side of the connector(harness side?) then? I can pull a motor but electrical is my Achilles

    AJ (no More Alan) 84 Rampage RT TIII/568 Quaife 87 GLHS dealer optioned Red 16V Masi/568/Quaife
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    89 TC Masi 16V Red/Ginger/Black
    86 GLHS #110 RoadRace Built 89 CSX-VNT Recaro Car
    89 Turbo Mini 'Woody' 85 GLHT 'RedBox'
    2014 Explorer DD'r 3.5Twin Turbo Ecoboost AWD and 500HP
    My profile page has over 20,000 views, I'm somebody LOL

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