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  • Electrical / ecm issue????!!!!
  • Electrical / ecm issue????!!!!
  • Electrical / ecm issue????!!!!
  • Electrical / ecm issue????!!!!

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  1. #1
    LNS88VETTE
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    Default Electrical / ecm issue????!!!!

    STARTED OUT FINE, DROVE AROUND ALL MORNING, STOPPING AND STARTING; GOT HOME, TWO HOURS LATER CAR TURNED OVER VERY SLOWLY; CHECKED BATTERY HAD 12.3 VDC; CHARGED IT AWHILE STARTED UP BUT IS SEVERLY MISSING; TIMINGS PERFECT, NEW PLUGS & WIRES....NO CODES ARE COMING UP; BUT MY DASH IS GOIN CRAZY TURNING ON AND OFF ALL GUAGES ARE SPERATICALLY JUMPING UP AND DOWN MY AC DISPLAY IS REVOLVING GIBBERISH....ECM? IF SO ANYONE KNOW WHERE I CAN SEND IT TO HAVE IT CHECK OUT AND OR REBUILT???? OH AND WHATS THE EASIEST WAY TO GET TO IT; TIPS WOULD BE GREATLY APPRECIATED

  2. #2
    Member TWISTERUP's Avatar
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    Be sure the battery cables are clean and tight, it would be a good idea to remove them and check. It sounds like a ground problem--not the ECM to me. If the battery cables are clean/tight--use your FSM to find the ground points and be sure they are clean/tight.

  3. #3
    LNS88VETTE
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    CHECKED ALL THE GROUNDS I COULD POSSIBLE FIND; EVEN INSTALLED A NEW ONE BETWEEN THE BLOCK AND FRAME.......STILL MISSING AND SEVERE LOSS IN POWER AND THE VALVES PINGING NOW!.....ARE THERE ANY GROUNDS BETWEEN BLOCK/ BELL HOUSING? NOTICED A VACUUM LINE (PLASTIC) THAT RUNS OFF THE PASSENGER SIDE OF PLENUM AND DOWN BEHIND DISTRIBUTER; ANYONE KNOW WHERE THAT TERMINATES @?...

  4. #4
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    Default are you really sure about the battery ground?

    Quote Originally Posted by LNS88VETTE View Post
    CHECKED ALL THE GROUNDS I COULD POSSIBLE FIND; EVEN INSTALLED A NEW ONE BETWEEN THE BLOCK AND FRAME.......STILL MISSING AND SEVERE LOSS IN POWER AND THE VALVES PINGING NOW!.....ARE THERE ANY GROUNDS BETWEEN BLOCK/ BELL HOUSING? NOTICED A VACUUM LINE (PLASTIC) THAT RUNS OFF THE PASSENGER SIDE OF PLENUM AND DOWN BEHIND DISTRIBUTER; ANYONE KNOW WHERE THAT TERMINATES @?...
    I had a similar problem a couple of years ago, - sluggish starting and gauges going crazy - Checked and I thought everything was tight. Turned to the folks on this forum and they suggested a bad ground somewhere - I went to remove the battery as there are some grounds underneath it and found the battery ground was loose. Cleaned and tightened it and everything was fine again.

  5. #5
    Member Schrade's Avatar
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    What codes are you getting?

    Half a dozen DTC's will lead you to the harness that has the failed COMMON ground for those circuits...
    Never got a nickel for wrenchin', so I know nuthin'...

    Get rid of your electrons. Be positive (+).



  6. #6
    LNS88VETTE
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    no codes @ all and pulled the battery, had it load tested, it was bad; purchased a new one and still runs the same just turns over faster... so back to the drawing board i go..im currently going back over all my grounds as we speak (or i type rather); keep ya posted, no pun intended

  7. #7
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    Quote Originally Posted by LNS88VETTE View Post
    no codes @ all and pulled the battery, had it load tested, it was bad; purchased a new one and still runs the same just turns over faster... so back to the drawing board i go..im currently going back over all my grounds as we speak (or i type rather); keep ya posted, no pun intended

    be sure to locate and check the harness group on the block or bellhousing near the filter...4 or 5 wires in one stack, including the dash and ecm grounds.

  8. #8
    Member Schrade's Avatar
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    I have 2 batteries working now that failed the 'Load test'.

    1 failed a year and a half ago. The other failed 2 or 2 1/2 years ago - can't remember.

    HAL 9000 did a better job predicting AE-35 failure.


    edit:
    Re-reading your first post... You had 12.3 V, and it started, so you replaced the ground cable, then the battery.

    ???

    Maybe the air freshener is stale?
    Never got a nickel for wrenchin', so I know nuthin'...

    Get rid of your electrons. Be positive (+).



  9. #9
    LNS88VETTE
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    ya, my air freshener was as stale as your response;............. voltage goes down, ampreres go up

  10. #10
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    Quote Originally Posted by LNS88VETTE View Post
    voltage goes down, ampreres go up
    Not in the case of a battery. Low voltage = low state of charge, which means the battery won't be capable of putting out all the current it's designed to.

  11. #11
    LNS88VETTE
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    Well, after many hours the problem was solved, but not quit sure if all or just a portion of the issues were the culprit....when reevaluating my grounds (3-4) on the drivers side of the bell housing next to my 02 sensor i traced them one by one and found just one had broken inside the insulation and butt spliced it...she stared up and ran smooth, went for a test drive and had a severe lack of power, checked timing and was intermittently correct ( 2BTC); pulled my distributer found the a chaffed wire and a tooth missing off the gear.. replaced the distributer and all is running absolutely purfect...... thank you 4 ever ones help and input!!!!!!!!

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