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The Road Runner runs and drives! BUT..need help.Update!
#1299287
09/07/12 05:43 PM
09/07/12 05:43 PM
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Joined: Feb 2006
Posts: 551
Great Lakes State
ONEBADBIRD
OP
mopar
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OP
mopar
Joined: Feb 2006
Posts: 551
Great Lakes State
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Well the 69 Road Runner is on the road! but...., about 20 minutes into the ride it starts to run rougher and rougher until it dies completely. What I have is a 440 block rebuilt with stock iron heads rebuilt, stock intake, 750 Holley double pumper carb (mech. secondaries), Mopar electronic ignition(all new components), 727 trans rebuilt(with new converter), power disc brake upgrade (front only). So the car has had the timing set and the carb idle adjusted and runs great off the start idles good, runs good under the load of the trans, but after about 20 minute ride or so it starts to run rougher and rougher until it just stalls out completely. It has 195 thermostat and runs cool while driving around 190/195. It has a new sending unit (5/16) in the gas tank, new gas, new rubber lines, new fuel filter. Now to me it just seems related that when everything under the hood warms up it starts acting up. Checked vacuum lines but will re-check again. What do you make of this situation? Have you experienced this similiar behavior with your ride? What should I check next? Thanks, Jay 
Last edited by ONEBADBIRD; 09/09/12 12:01 PM.
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Re: The Road Runner runs and drives! BUT.......need help.
[Re: ONEBADBIRD]
#1299293
09/07/12 06:52 PM
09/07/12 06:52 PM
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Joined: Feb 2006
Posts: 551
Great Lakes State
ONEBADBIRD
OP
mopar
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OP
mopar
Joined: Feb 2006
Posts: 551
Great Lakes State
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My orange box is against the firewall along with the ballast resistor and the coil is mounted on top of the intake as stock. I have an (Accel coil yellow super stock) are they junk too? It seems to me the heat is affecting something? I have heard some people running the chrome box but why? It runs great to start but starts running like the timing is off? Is there any way to test any of these mentioned components? Thanks, Jay
Last edited by ONEBADBIRD; 09/07/12 06:58 PM.
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Re: The Road Runner runs and drives! BUT.......need help.
[Re: ONEBADBIRD]
#1299294
09/07/12 06:57 PM
09/07/12 06:57 PM
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Joined: Sep 2003
Posts: 3,426
weymouth,mass.
meepmeep70
master
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master
Joined: Sep 2003
Posts: 3,426
weymouth,mass.
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not sure how you will test,my car ran great,sputtered and died after 15 min.,cool for a few minutes fire right up,ran great again for 15min,ECU was getting hot(mounted on firewall as well).if it was me i would buy a new one and install,should be able to grab one for 25.00 at autozone or the likes 
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Re: The Road Runner runs and drives! BUT.......need help.
[Re: ONEBADBIRD]
#1299296
09/07/12 06:59 PM
09/07/12 06:59 PM
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Joined: Jan 2012
Posts: 1,650
Harm City Md.
Dan Halen
top fuel
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top fuel
Joined: Jan 2012
Posts: 1,650
Harm City Md.
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Just went through this with a friends car. When the car stalls see if you can hold your hand on the carb without burning it. He added a heat shield under the carb and now it runs great. 
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Re: The Road Runner runs and drives! BUT.......need help.
[Re: meepmeep70]
#1299297
09/07/12 07:43 PM
09/07/12 07:43 PM
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Joined: Apr 2010
Posts: 4,154
bethlehem pa
mikemee1331
master
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master
Joined: Apr 2010
Posts: 4,154
bethlehem pa
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Quote:
not sure how you will test,my car ran great,sputtered and died after 15 min.,cool for a few minutes fire right up,ran great again for 15min,ECU was getting hot(mounted on firewall as well).if it was me i would buy a new one and install,should be able to grab one for 25.00 at autozone or the likes
this would be my suggestion. what ohm is the ballast you are using, and no that coil is not junk.
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Re: The Road Runner runs and drives! BUT.......need help.
[Re: RapidRobert]
#1299301
09/08/12 07:58 AM
09/08/12 07:58 AM
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Joined: Apr 2010
Posts: 4,154
bethlehem pa
mikemee1331
master
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master
Joined: Apr 2010
Posts: 4,154
bethlehem pa
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Quote:
Quote:
Well I picked up a new ECU at the local auto parts store and it seems so far to do the trick!
Success  . I didn't think the 4 terminal ballast harness was used in '69. I'm assuming the 4 terminal ballast will plug in to the harness (has 2 double ends) only 1 way so that you are on the lowest ohm half of the ballast. As you researched the other side of the ballast is not used on a 4 pin ECU.
you sir are correct. 69 should be a 2 pin. but, don't we all tend to use what we got and make it work? that's half the fun!
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Re: The Road Runner runs and drives! BUT.......need help.
[Re: ONEBADBIRD]
#1299305
09/09/12 12:30 PM
09/09/12 12:30 PM
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Joined: Apr 2010
Posts: 4,154
bethlehem pa
mikemee1331
master
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master
Joined: Apr 2010
Posts: 4,154
bethlehem pa
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Quote:
Well the car is up to its old tricks again! Took it out last night about 20 to 30 minutes and it slowly started to go down hill with starting to stumble and chugging. I could hear it coming on so I headed for home and as I turned the corner it died out let it sit for 30 seconds and fire it up chirped the tires a few time to keep it running and pulled into the drive in which it died again. Sounds to me like it could be a fuel delivery problem maybe?
this is more consistent with a gradual buildup of heat in the electricial components than it is with a fuel issue. that leads me back to the 4 pin ballast when 1969 only has 2. how old is that coil? and once again, what ohm is that ballast? do you know why your wiring has been changed to a 4 pin??
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Re: The Road Runner runs and drives! BUT.......need help.
[Re: mikemee1331]
#1299307
09/09/12 12:59 PM
09/09/12 12:59 PM
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Joined: Apr 2010
Posts: 4,154
bethlehem pa
mikemee1331
master
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master
Joined: Apr 2010
Posts: 4,154
bethlehem pa
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Quote:
Quote:
Well the car is up to its old tricks again! Took it out last night about 20 to 30 minutes and it slowly started to go down hill with starting to stumble and chugging. I could hear it coming on so I headed for home and as I turned the corner it died out let it sit for 30 seconds and fire it up chirped the tires a few time to keep it running and pulled into the drive in which it died again. Sounds to me like it could be a fuel delivery problem maybe?
this is more consistent with a gradual buildup of heat in the electricial components than it is with a fuel issue. that leads me back to the 4 pin ballast when 1969 only has 2. how old is that coil? and once again, what ohm is that ballast? do you know why your wiring has been changed to a 4 pin??
answered my own question after i re-read your post. your new harness came with a 4 pin. ok then, most likely the 5th pin on your ecu is not being used and you don't need a 4 pin ballast. i reading around on the coil you are using it seems it requires a 1.2ohm ballast. what are you using? i'm guessing a .5 ohm?
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Re: The Road Runner runs and drives! BUT.......need help.
[Re: ONEBADBIRD]
#1299312
09/09/12 05:30 PM
09/09/12 05:30 PM
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Joined: Feb 2003
Posts: 10,200
Someplace you aren't
SomeCarGuy
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 10,200
Someplace you aren't
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You have a bad ground for the ECU. This is consistant with causing your problem. The more heat that builds, the worse it makes the ground. The reason so many people have "bad" ECU boxes is because they establish a new good ground by R&R the box. You were good for a short time until the ground corroded again.
I would run a ground wire from the mounting screw to the battery and be done with it.
I want my fair share
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