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Thread: No spark

  1. #51
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    Quote Originally Posted by Bullitt View Post
    Hi!

    Installed the Ignition tester light between a spark plug and the wire from distributor.
    Cranked the egnine. No spark, except from when I shut of the ignition. (On one of the two plug wires I checked)
    I’ve read about that exact same symptom in a different “no spark” thread here on dmctalk. Or maybe on the eurotech forum.

    Sadly I don’t remember what the cause was...


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  2. #52
    Senior Member Bullitt's Avatar
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    Location:  Sirevåg, Norway

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    Checking spark from coil to distributor:
    https://www.facebook.com/sveinapelan...382510259/?t=0

    Checking spark on plugs:
    https://www.facebook.com/sveinapelan...393000259/?t=0

    Connected a test light between negative post on coil and battery positive post to see if light flashes on and off, meaning Pickup and ECU should be ok:
    https://www.facebook.com/sveinapelan...399200259/?t=0
    Svein Apeland

    1981 DMC DeLorean DMC-12, VIN: 01598. Gas flap hood, manual transmission, black interior, wide stripe, galvanized frame, Spax and UK club exhaust.
    x1979 Pontiac Firebird Trans Am
    x1975 Chevrolet El Camino
    x1974 Plymouth Satellite Sebring
    x1966 Lincoln Continental
    x1983 Porsche 944
    x1982 Porsche 944

  3. #53
    Senior Member DMC5180's Avatar
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    Did you ever get spark to jump from the coil tower to a ground or neg post on the coil?


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    DENNIS

    VIN 5180, Frame 3652, STAGE I, DM-eng Solid State Solutions (RPM Rly, Dm.Lt.Mod., Fan Fail Mod. , FAN Rly, HS.Rly) , HID sealed beam style headlights, SPAX user since 2009, Eibach springs, Mid-State Club Adj. Rear LCA's, DPNW poly-sway bar kit, DMCEU LCA Stabilizer link kit, DMCMW Illuminated door sills, Aussie Illuminated SS Shifter plate, GENUINE MOMO EVO Steering wheel, DELOREANA Extended View Side Mirrors w/ Heaters, DELOREANA LED Door Lights.

  4. #54
    Administrator Ron's Avatar
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    Either coil should spark according to those readings....try the test I posted above to confirm if the below doesn't help.

    If the battery will crank the engine over ok by itself, it is hot enough for spark.

    Quote Originally Posted by Bullitt View Post
    ...
    Put a Ignition tester light between distributor and wire from coil to distributor, and it glows while I crank.
    I pull off the distributor cap and inspect the rotor an cap, and find some oxidation. (I am going to buy new ones, but I don't have them at hand right now)
    i brushed off the oxidation and cleaned them up. Checked that the rotor in fact turns while I crank.
    Put the rotor and cap back on.
    Installed the Ignition tester light between a spark plug and the wire from distributor.
    Cranked the egnine. No spark, except
    from when I shut of the ignition. (On one of the two plug wires I checked)
    Hoped the cleaning of the cap and rotor should give me some spark in the test light.....

    Read somewhere that if you put an ice pick light tester on the negative post on coil and on to the positive battery cable post, the light should go off and on while cranking,
    It did, but I would not say it went off, but rather that the light dimmed off and on..... If this happend that meant that the ECU should be good, as the TACH reading also said.

    Mesured the resictance in the pick up coil, which fluctuated while I was cranking, mening that the pick up coil should be good as well. (I read somewhere....)

    Keep in mind I disconnected the RPM relay to stop fuel pump while cranking. (Or does the RPM relay have anything to say on the ignition?


    Any input?
    Sparking only when you shut the ignition off suggests that the coils trigger circuit is always grounded. (It would fire whichever plug the rotor happened to be pointed at when the key was turned to OFF.) But if that were the case, the ignition tester (and tach) shouldn't be indicating continuous spark while you crank it over.
    So, the only thing I can think of that may fit is a cap with its coil terminal shorted to the plug terminal feeding the only plug you are seeing fire...

    =====

    No. The ignition doesn't need the RPM relay.
    If there are no shorted wires etc. between them it doesn't matter WRT no spark. The relay uses the tach signal to know it is ok to supply power to the fuel pump and CPR.

    P.S. Your Facebook links require an account....

  5. #55
    Senior Member Bullitt's Avatar
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    Quote Originally Posted by Ron View Post
    Either coil should spark according to those readings....try the test I posted above to confirm if the below doesn't help.

    If the battery will crank the engine over ok by itself, it is hot enough for spark.

    Sparking only when you shut the ignition off suggests that the coils trigger circuit is always grounded. (It would fire whichever plug the rotor happened to be pointed at when the key was turned to OFF.) But if that were the case, the ignition tester (and tach) shouldn't be indicating continuous spark while you crank it over.
    So, the only thing I can think of that may fit is a cap with its coil terminal shorted to the plug terminal feeding the only plug you are seeing fire...

    =====

    No. The ignition doesn't need the RPM relay.
    If there are no shorted wires etc. between them it doesn't matter WRT no spark. The relay uses the tach signal to know it is ok to supply power to the fuel pump and CPR.

    P.S. Your Facebook links require an account....
    Hey!

    Sorry Ron, I totally missed your earlier post.
    I will try that today.

    Ill post the videos here.
    Svein Apeland

    1981 DMC DeLorean DMC-12, VIN: 01598. Gas flap hood, manual transmission, black interior, wide stripe, galvanized frame, Spax and UK club exhaust.
    x1979 Pontiac Firebird Trans Am
    x1975 Chevrolet El Camino
    x1974 Plymouth Satellite Sebring
    x1966 Lincoln Continental
    x1983 Porsche 944
    x1982 Porsche 944

  6. #56
    Senior Member Bullitt's Avatar
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    Location:  Sirevåg, Norway

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    Testing Distributor from negative terminal to battery positive post Delorean
    https://youtu.be/oHRR7ZB-ufs

    Testing spark from coil wire to distributor cap Delorean
    https://youtu.be/bmkuDlzQZ0A

    Testing spark from sparkplug wire to sparkplug Delorean
    https://youtu.be/x3NxgwJnDpI
    Svein Apeland

    1981 DMC DeLorean DMC-12, VIN: 01598. Gas flap hood, manual transmission, black interior, wide stripe, galvanized frame, Spax and UK club exhaust.
    x1979 Pontiac Firebird Trans Am
    x1975 Chevrolet El Camino
    x1974 Plymouth Satellite Sebring
    x1966 Lincoln Continental
    x1983 Porsche 944
    x1982 Porsche 944

  7. #57
    Member
    Join Date:  Apr 2015

    Posts:    39

    Was the king lead from the coil to the distributor ever changed? Or is it still the old red one?

  8. #58
    Senior Member Bullitt's Avatar
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    Location:  Sirevåg, Norway

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    My VIN:    01598

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    Quote Originally Posted by minispeedstar View Post
    Was the king lead from the coil to the distributor ever changed? Or is it still the old red one?
    Well... Its barely used, but bought 8 years ago. Thinking of the condition the cap and rotor is in, I ordered new wires and plugs with the cap and rotor.

    Last time it would not start it was exactly this I had to change. This was right before I started the restoration.
    Svein Apeland

    1981 DMC DeLorean DMC-12, VIN: 01598. Gas flap hood, manual transmission, black interior, wide stripe, galvanized frame, Spax and UK club exhaust.
    x1979 Pontiac Firebird Trans Am
    x1975 Chevrolet El Camino
    x1974 Plymouth Satellite Sebring
    x1966 Lincoln Continental
    x1983 Porsche 944
    x1982 Porsche 944

  9. #59
    Member
    Join Date:  Apr 2015

    Posts:    39

    Original NOS? As I've found they don't age well if it's an original red type lead.

  10. #60
    Senior Member Bullitt's Avatar
    Join Date:  Sep 2011

    Location:  Sirevåg, Norway

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    My VIN:    01598

    Club(s):   (DCH)

    Quote Originally Posted by minispeedstar View Post
    Original NOS? As I've found they don't age well if it's an original red type lead.
    Nope, it was black.. That is all I know!
    Svein Apeland

    1981 DMC DeLorean DMC-12, VIN: 01598. Gas flap hood, manual transmission, black interior, wide stripe, galvanized frame, Spax and UK club exhaust.
    x1979 Pontiac Firebird Trans Am
    x1975 Chevrolet El Camino
    x1974 Plymouth Satellite Sebring
    x1966 Lincoln Continental
    x1983 Porsche 944
    x1982 Porsche 944

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