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Thread: Weird sudden stall...it's immediate.

  1. #1
    Fuel Injected! woody80z28's Avatar
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    Weird sudden stall...it's immediate.

    Working on my tune for my Beretta (7730 $A1) and ran into a new problem. I've been using this same car, ECM, sensors, etc and basic tune for many years. Changed heads & cam and injectors and the main thing that's different is the BPC vs EGR to account for the injectors.

    Several times (probably almost a dozen) in the last couple days it has suddenly stalled. And it's immediate like I turned the key off. Fires back up no problem though. And it has only been while idling, or when coming back down to idle after disengaging the clutch. I noticed in the logs it goes from normal readings to dead readings in one sample. Capture attached.

    Not sure what I got going on here. Any ideas? Attached a log and my ADX too. Thanks
    Attached Images Attached Images
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    80 Camaro Z28 - 550hp AFR 383 / T56 6spd (Holley HP EFI)
    91 Beretta "SS" - 260hp 3400 MPFI / HM282 5spd (7730/$A1)
    94 Silverado Z71 - 300hp Vortec 357 TBI / NV4500 5spd (7427/$0D)

  2. #2
    Fuel Injected! woody80z28's Avatar
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    So, the car sat in the garage for a few days while it was snowing outside and now it doesn't run. Gives me a Code 51 PROM error and will barely start and miss horribly. I think it's running off the limp tune.

    So I put in another PROM I had and it did the same thing. So I even burned a tune 1 step back that I know ran. Same thing. Think the ECM is shot?
    80 Camaro Z28 - 550hp AFR 383 / T56 6spd (Holley HP EFI)
    91 Beretta "SS" - 260hp 3400 MPFI / HM282 5spd (7730/$A1)
    94 Silverado Z71 - 300hp Vortec 357 TBI / NV4500 5spd (7427/$0D)

  3. #3
    Fuel Injected! S.O.B.B.'s Avatar
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    Don't know if this will help but I had the same code on my setup on initial trying to start engine.it was the chip not making contact.at key on the check engine light would come on then off then flash quickly. Once the chip made proper contact on all the pins it worked.I also had the same problem after soldering in a chip socket.I checked continuity to each pin with dvm and found one not making contact. U might try wiggling the chip and see if it starts.hth
    Jeeper
    87 sjimmy 4.5L /nv1500/ 8.8 3.55 rear/disc brakes.

  4. #4
    Fuel Injected! woody80z28's Avatar
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    Thanks for the reply. I'll check out the pins on the ECM itself and see how it looks. I have had stuff in & out of there a hundred times. I did try two Memcals, two different 27SF512 chips, two tunes and also the ribbon for emulating.
    So the ECM seems like the only common denominator left.
    80 Camaro Z28 - 550hp AFR 383 / T56 6spd (Holley HP EFI)
    91 Beretta "SS" - 260hp 3400 MPFI / HM282 5spd (7730/$A1)
    94 Silverado Z71 - 300hp Vortec 357 TBI / NV4500 5spd (7427/$0D)

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