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Thread: Strange Issue - Bogs Under Acceleration

  1. #1
    As seen on TV! Dracula's Avatar
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    Strange Issue - Bogs Under Acceleration

    After much difficulty, I've gotten my car to run once more. I bypassed the ballast resistors, changed the plugs, put on a new cap and rotor, a high voltage coil, new intake gaskets, and verified that I don't have a vacuum leak; yet, when I step on the gas, the car nearly cuts out and bogs down. I have to feather it to get it to run while the vehicle is sitting.

    This is the "Before" video:



    After replacing all the ignition components:

    -Chad K.
    Previous owner of VINS: 6982, 1601, 1265, and 1269

    Dammit, Jim. I'm an undertaker, not a mechanic.

  2. #2
    How old is your carb?
    Bungee Cup Holder Guru

  3. #3
    Have you checked to make sure the gaskets are the correct ones? That was most of my problem.
    Angela N.
    Proud owner of "DeLores"- VIN 1269

    If you have one foot in yesterday and one foot in tomorrow, you're pissing all over today. Unless, of course, you have two feet in a DeLorean.

  4. #4
    As seen on TV! Dracula's Avatar
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    Quote Originally Posted by Duplicate Account View Post
    How old is your carb?
    The carb was completely rebuilt about a year ago; I even shipped it to Steve to see if it would run on his car. He said it was fine.

    Quote Originally Posted by DeLoreanGirl View Post
    Have you checked to make sure the gaskets are the correct ones? That was most of my problem.
    I did; I made up two new ones for it myself, so I'm fairly confident in the gaskets.
    -Chad K.
    Previous owner of VINS: 6982, 1601, 1265, and 1269

    Dammit, Jim. I'm an undertaker, not a mechanic.

  5. #5
    Do you see the squirt of fuel in the carb from the accelerator pump? After you shut the engine off, look down the carb as you punch the throttle. You will only see that one or two times until you run the engine and shut down again.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  6. #6
    Do you see the squirt of fuel in the carb from the accelerator pump? After you shut the engine off, look down the carb as you punch the throttle. You will only see that one or two times until you run the engine and shut down again.

    Edit. Your second video short of answered my question.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  7. #7
    Uncensored Hypocrite stevedmc's Avatar
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    Great. Now I'm going to have to drive all the way out there so Chad's car can run. That thing did work fine when it was on my car.
    Rest assured, we have a backup of Farrar's car blog and it will be restored in the near future. (Steve Rice - March 2016)
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  8. #8
    As seen on TV! Dracula's Avatar
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    I may have to put a trailer hitch on my Imperial and take it out to the next tech session.
    -Chad K.
    Previous owner of VINS: 6982, 1601, 1265, and 1269

    Dammit, Jim. I'm an undertaker, not a mechanic.

  9. #9
    As seen on TV! Dracula's Avatar
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    I tried wiring in a Duraspark module and now it doesn't even fire...

    20170926_182925.jpg

    20170926_182933.jpg

    I followed the schematic as seen here:



    I have no idea why the car isn't at least starting like it was yesterday...
    -Chad K.
    Previous owner of VINS: 6982, 1601, 1265, and 1269

    Dammit, Jim. I'm an undertaker, not a mechanic.

  10. #10
    Quote Originally Posted by Dracula View Post
    I tried wiring in a Duraspark module and now it doesn't even fire...

    20170926_182925.jpg

    20170926_182933.jpg

    I followed the schematic as seen here:



    I have no idea why the car isn't at least starting like it was yesterday...
    I tested one of Bill units and this is what I found.


    Ford ECU

    Well I could not wait. So hooked up the Ford unit and ran my tests. One thing, the wiring diagram showed the distributor sensor signal and ground terminals reversed (my engine barely started until I reversed those wires).

    Ignition timing = 13 deg BTC
    0 RPM coil current = 7.0 amps
    850 RPM coil current = 5.6 amps and 70 deg dwell on 4 cylinder scale
    2500 RPM coil current = 4.1 amps and 65 deg dwell on 4 cylinder scale

    So it does seem like the Ford ECU does not change dwell much with RPM increase. Also works like the stock unit and draws power with the key on and engine not running.
    Dave M vin 03572
    http://dm-eng.weebly.com/

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