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Help---Mystery problem !! #2698844
09/19/19 12:57 AM
09/19/19 12:57 AM
Joined: Jul 2004
Posts: 4,344
Worst Weather USA
493_DART Offline OP
master
493_DART  Offline OP
master

Joined: Jul 2004
Posts: 4,344
Worst Weather USA
Long story here...........I hope someone can throw me some ideas ?

Right now -----My dart----fresh motor . I have no spark from the coil . Months ago i fired up the car with this motor , and the timing was WAY off . It sounded crisp but wouldnt idle. This is just firing it up --so I had a buddy help fire it back up and the timing light said 60 deg btc ! So i backed it down to 30 and it wouldnt even start at normal timing...just sputter. Seemed normal when the timing light said 60btc....?

I recently looked at everything--looked at cam lobes , rockers , lash , cleaned the carb , timing chain+ gears .....Full on Leak down test----.even tried a new UNILITE that burned up in a couple minutes....a new coil , and a new MP ecu .

Now... Lets back up .......before i fired up the fresh motor last winter , i had a mishap. My buddy handed me the battery to put in the trunk , and i didnt have the light in the trunk.........i said ---Are you sure the Positive is to the rear? he said Yes................nope..... my dumass hooked it up.....backwards... we turned car on and had nice smoke by the engine....it burned a fusible link. Im still kicking myself for that.

SO----my buddy bought me a new chrome MP ecu.....I had the battery tested at Oreilly--tests perfect.. Nothing else looks hurt / burnt .

so tonight..i went and tried again--no spark and the ECU transistor gets REAL hot !! I had another ecu i plugged in---same thing--transistor gets super hot . I have 11.8v at both sides of the ballast...and both sides of the coil with ign ON . This is a MP distributor .

Nothing as far as wiring has changed on the car during this fiasco....

Im lost here............do i have 2 bad ECU boxes ? ive swapped coils..........the car ran weirdly with the new Unilite too...like the ignition is wayy screwed up . But it did RUN...........now..no spark ..


Yes i would love to scrap it all and put a switch panel in and a Msd setup---but no $$$$ to do that. Id like to find whats wrong with this setup because its worked great since 2008 !!

Last edited by 493_DART; 09/19/19 12:59 AM.
Re: Help---Mystery problem !! [Re: 493_DART] #2698851
09/19/19 02:26 AM
09/19/19 02:26 AM
Joined: Oct 2014
Posts: 116
AZ
squirrel Offline
member
squirrel  Offline
member

Joined: Oct 2014
Posts: 116
AZ
Did you test the pickup coil in the original distributor?

How did you connect the Unilite? It does not require the Mopar ignition amplifier box (the thing you call the ECU?), it just gets power, ground, and has an output to the coil. If you connected it as you would a Mopar distributor, yeah, it could burn up.

The alternator might not have liked getting reverse polarity, either.

Re: Help---Mystery problem !! [Re: 493_DART] #2698943
09/19/19 11:32 AM
09/19/19 11:32 AM
Joined: Nov 2003
Posts: 35,466
Lincoln Nebraska
R
RapidRobert Offline
Circle Track
RapidRobert  Offline
Circle Track
R

Joined: Nov 2003
Posts: 35,466
Lincoln Nebraska
I would set the damperner at 15 BTDC on #1 compression (or your known/preferred initial #) then set the dist so the magnet is dead even with the tooth & the #1 plug wire is above or near above the rotor. But first pull the yellow (ign) wire off of the starter relay to disable the starter & pull the #1 plug wire out of the dist cap & hold it 1/4 from a ground & seperate the dist zigzag pickup connector & drag the male terminal on the body half of the connector across the intake surface to make/break ground & see if the coil wire sparks to ground with the key "on" & with a helper holding it to "crank". this takes the dist out of the picture. Holler back EDIT what Squirrel said, confirm you have the right stuff in there

Last edited by RapidRobert; 09/19/19 11:34 AM.

live every 24 hour block of time like it's your last day on earth
Re: Help---Mystery problem !! [Re: RapidRobert] #2698954
09/19/19 12:00 PM
09/19/19 12:00 PM
Joined: Feb 2005
Posts: 14,769
PA.
pittsburghracer Offline
"Little"John
pittsburghracer  Offline
"Little"John

Joined: Feb 2005
Posts: 14,769
PA.
Screw a top dead center stop in cylinder number one and carefully check top dead center to make sure your damper didn't spin to double-check your timing issue. Lots of out of Country dampers are spinning.


1970 Duster
Edelbrock headed 408
6.143@110.85 mph
9.73@135.05 mph shifting at 6700 RPM
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time




Re: Help---Mystery problem !! [Re: pittsburghracer] #2698955
09/19/19 12:07 PM
09/19/19 12:07 PM
Joined: Jan 2003
Posts: 8,625
Frostbitefalls (Rocky&Bullwink...
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gregsdart Offline
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gregsdart  Offline
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G

Joined: Jan 2003
Posts: 8,625
Frostbitefalls (Rocky&Bullwink...
Originally Posted by pittsburghracer
Screw a top dead center stop in cylinder number one and carefully check top dead center to make sure your damper didn't spin to double-check your timing issue. Lots of out of Country dampers are spinning.

Yep .

Re: Help---Mystery problem !! [Re: pittsburghracer] #2698993
09/19/19 02:45 PM
09/19/19 02:45 PM
Joined: Jul 2004
Posts: 4,344
Worst Weather USA
493_DART Offline OP
master
493_DART  Offline OP
master

Joined: Jul 2004
Posts: 4,344
Worst Weather USA
Originally Posted by pittsburghracer
Screw a top dead center stop in cylinder number one and carefully check top dead center to make sure your damper didn't spin to double-check your timing issue. Lots of out of Country dampers are spinning.


the damper isnt going to make my coil Not spark...im thinking its the coil and/ or the ecu............I can double check the dist pickup but i think i did and it was giving a pulse ...........again ive swapped both BUT , i dont know if the replacements were any good to begin with !

yes i had the Unilite wired correct

I think the clue here is nothing changed with wiring....it ran great until the battery incident .....i have no spark out of the coil , and the ecu Transistor is getting super hot . I have a Kill/ Run switch--its working ..and i have a starter button...its working . 11.8vdc to coil pos/ neg and same at ballast terminals

if my timing is off....im sure would still have spark out of the coil ...weather its 40 deg btc or 0 btdc

Re: Help---Mystery problem !! [Re: 493_DART] #2698998
09/19/19 03:18 PM
09/19/19 03:18 PM
Joined: Sep 2014
Posts: 2,840
Washington
M
madscientist Offline
master
madscientist  Offline
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M

Joined: Sep 2014
Posts: 2,840
Washington
Originally Posted by 493_DART
Originally Posted by pittsburghracer
Screw a top dead center stop in cylinder number one and carefully check top dead center to make sure your damper didn't spin to double-check your timing issue. Lots of out of Country dampers are spinning.


the damper isnt going to make my coil Not spark...im thinking its the coil and/ or the ecu............I can double check the dist pickup but i think i did and it was giving a pulse ...........again ive swapped both BUT , i dont know if the replacements were any good to begin with !

yes i had the Unilite wired correct

I think the clue here is nothing changed with wiring....it ran great until the battery incident .....i have no spark out of the coil , and the ecu Transistor is getting super hot . I have a Kill/ Run switch--its working ..and i have a starter button...its working . 11.8vdc to coil pos/ neg and same at ballast terminals

if my timing is off....im sure would still have spark out of the coil ...weather its 40 deg btc or 0 btdc


If you killed the Unilite, that's a sign there's an issue somewhere.


Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
Re: Help---Mystery problem !! [Re: madscientist] #2699003
09/19/19 03:35 PM
09/19/19 03:35 PM
Joined: Jan 2003
Posts: 6,089
Minnesota
Hemi_Joel Offline
master
Hemi_Joel  Offline
master

Joined: Jan 2003
Posts: 6,089
Minnesota
Verify that the distributor is turning when the engine cranks. The distributor gear pin could be sheared. It can still turn some on friction.

Last edited by Hemi_Joel; 09/19/19 03:39 PM.
Re: Help---Mystery problem !! [Re: Hemi_Joel] #2699091
09/19/19 08:42 PM
09/19/19 08:42 PM
Joined: Feb 2003
Posts: 1,641
Ontario,Canada
F
firefighter3931 Offline
top fuel
firefighter3931  Offline
top fuel
F

Joined: Feb 2003
Posts: 1,641
Ontario,Canada
Try reversing the pickup wires. I had a similar problem in the past nd the car wouldn't even fire until I reversed the pickup wires.


Ron

Re: Help---Mystery problem !! [Re: firefighter3931] #2699649
09/21/19 09:52 PM
09/21/19 09:52 PM
Joined: May 2009
Posts: 62
montreal, quebec,canada
7
7e5dartsport Offline
member
7e5dartsport  Offline
member
7

Joined: May 2009
Posts: 62
montreal, quebec,canada
if you have a 4pin ballast resistor, test its resistance. one side should be 5 ohms, the other 0.5 ohms. if you have a 2pin resistor, it should be from 0.25 to 0.5 ohms. all these tests with the connectors at the resistor disconnected for testing.


fully legal sounds the same as full illegal...
Re: Help---Mystery problem !! [Re: 7e5dartsport] #2699948
09/22/19 08:29 PM
09/22/19 08:29 PM
Joined: Jul 2004
Posts: 4,344
Worst Weather USA
493_DART Offline OP
master
493_DART  Offline OP
master

Joined: Jul 2004
Posts: 4,344
Worst Weather USA
its good , 0.8 ohms


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