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Can't get rid of a miss!!! Help!
#724806
06/15/10 09:16 AM
06/15/10 09:16 AM
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Joined: Mar 2010
Posts: 130
Marcell, MN
68 Roadrunner
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Marcell, MN
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I think it is in the ignition but I can't be sure. New motor (description in my sig.) I bought a Proform electronic ignition kit from Jegs (with the orange box) It runs "ok" (not great) in the garage in park. Under a load it runs terrible. I have checked the plugs, ohmed the plug wires, tried rejetting the carb, and so far no luck. Anyone else have problems with these aftermarket "mopar style" electronic ignitions? I found out now the orange box is not the best one...I should get the chrome one. Does anyone think that the box could be bad? Any other suggestions? The other thing I should add is that when wiring according to the directions it would not run. It only had spark when the key was in the start position. The tech guy at Proform said it was a bad ballast resistor. I changed it out and it did the same thing. So I wired it "my way"...with no ballast resistor. Basically key on power to the positive on the coil and the blue wire on the ignition module. Could this be the problem? Help!!!
1968 Roadrunner 383 auto
.060 KB 400 domed pistons, Stealth heads, Torker intake, Holley 830, Lunati Voodoo cam 276/284, .513/.533, TCI 3500, 3.91 gears, all ARP fasteners,
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Re: Can't get rid of a miss!!! Help!
[Re: 68 Roadrunner]
#724807
06/15/10 10:31 AM
06/15/10 10:31 AM
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Joined: Dec 2005
Posts: 1,495
Shelby mi.
JAKE68
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Shelby mi.
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i dought it is the box. What do you have for timing? particularly total? If it did not run right by the factory dirctions you may have not understood them correctly. It should be hooked up to the side of the balast that has power when key is on and then also power up while cranking. Not hard to figure out.
JAKES AUTOMOTIVE
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Re: Can't get rid of a miss!!! Help!
[Re: 68 Roadrunner]
#724808
06/15/10 10:34 AM
06/15/10 10:34 AM
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Joined: Jan 2003
Posts: 28,068
Irving, TX
feets
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Senior Management
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Irving, TX
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Get the voltage to the unit correct and then start trouble shooting.
Are you using a vacuum advance?
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon
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Re: Can't get rid of a miss!!! Help!
[Re: JAKE68]
#724809
06/15/10 10:36 AM
06/15/10 10:36 AM
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Joined: Mar 2010
Posts: 130
Marcell, MN
68 Roadrunner
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Yeah the directions are not hard to understand. It was wired exactly like the directions showed. I had 2 other people look at it to make sure I wired it according to the directions. It would not run. It only had spark when it was cranking. I have tried setting the initial timing at different places and it always runs the same. I'm not sure about the total at this point, it is whatever the dist. was set from the factory. I have set the initial without the vacuum advance hooked up at everywhere from 0 to 18 degrees advanced. Always runs like crap.
1968 Roadrunner 383 auto
.060 KB 400 domed pistons, Stealth heads, Torker intake, Holley 830, Lunati Voodoo cam 276/284, .513/.533, TCI 3500, 3.91 gears, all ARP fasteners,
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Re: Can't get rid of a miss!!! Help!
[Re: feets]
#724810
06/15/10 10:38 AM
06/15/10 10:38 AM
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Joined: Mar 2010
Posts: 130
Marcell, MN
68 Roadrunner
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Marcell, MN
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Quote:
Get the voltage to the unit correct and then start trouble shooting.
Are you using a vacuum advance?
I am using the vacuum advance. How do I get the correct voltage???
Last edited by 68 Roadrunner; 06/15/10 10:38 AM.
1968 Roadrunner 383 auto
.060 KB 400 domed pistons, Stealth heads, Torker intake, Holley 830, Lunati Voodoo cam 276/284, .513/.533, TCI 3500, 3.91 gears, all ARP fasteners,
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Re: Can't get rid of a miss!!! Help!
[Re: 68 Roadrunner]
#724811
06/15/10 10:41 AM
06/15/10 10:41 AM
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Joined: Mar 2010
Posts: 130
Marcell, MN
68 Roadrunner
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Here are the instructions that came with the kit. I wired it exactly like the diagram for "typical street rod installation". http://www.streetperformance.com/mistore/ART/MIGIheaders/100719/66991-66993-66995.pdf
1968 Roadrunner 383 auto
.060 KB 400 domed pistons, Stealth heads, Torker intake, Holley 830, Lunati Voodoo cam 276/284, .513/.533, TCI 3500, 3.91 gears, all ARP fasteners,
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Re: Can't get rid of a miss!!! Help!
[Re: 68 Roadrunner]
#724812
06/15/10 10:56 AM
06/15/10 10:56 AM
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Joined: Jan 2003
Posts: 28,068
Irving, TX
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Irving, TX
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The ballast resistor reduces voltage. You get less than 12 volts out of it. That's why they get really stinkin hot.
Make sure the advance in the distributor isn't yanking the timing all over the place.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon
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Re: Can't get rid of a miss!!! Help!
[Re: feets]
#724814
06/15/10 11:07 AM
06/15/10 11:07 AM
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Joined: Mar 2010
Posts: 130
Marcell, MN
68 Roadrunner
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Marcell, MN
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Quote:
The ballast resistor reduces voltage. You get less than 12 volts out of it. That's why they get really stinkin hot.
Make sure the advance in the distributor isn't yanking the timing all over the place.
Watching the timing light it seems to advance at a normal rate. Not jumping around. If I ever get it running decent I plan to put a timing tape on the balancer so I can see what the total advance is. Am I running too much voltage without the ballast resistor???
1968 Roadrunner 383 auto
.060 KB 400 domed pistons, Stealth heads, Torker intake, Holley 830, Lunati Voodoo cam 276/284, .513/.533, TCI 3500, 3.91 gears, all ARP fasteners,
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Re: Can't get rid of a miss!!! Help!
[Re: Kirby]
#724815
06/15/10 11:11 AM
06/15/10 11:11 AM
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Joined: Mar 2010
Posts: 130
Marcell, MN
68 Roadrunner
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Quote:
Eric- I've had a similar problem in the past. When cranking has weak spark as the starter is drawing power from your ignition system. On mine- if I let off the key just right, it would start and run- but like crap. You have to make sure you have enough power to your ignition system, whether or not you are cranking the motor. I can't remember the remedy, but it was in the wiring of the ballast/coil if I remember correctly. Also- make sure your battery has a full charge- stupid- but I've had that as an issue too. Just noticed the Marcell location- Do you know Dale/Brenda Hill? Friends of mine- great people, but don't ask Dale about your ignition problem- his mechanical abilities leave something to be desired- lol. If I get up there anytime soon-I'm due for a visit to the island, I can try and help you- good luck. Kirby 
I know Dale and Brenda very well. I am the manager of Lakeside Lumber & Hardware. I see Dale on a daily basis. Yeah I wasn't planning on asking him for any advice with this problem!!! I have a feeling it has something to do with my wiring, but I don't know how to fix it.
1968 Roadrunner 383 auto
.060 KB 400 domed pistons, Stealth heads, Torker intake, Holley 830, Lunati Voodoo cam 276/284, .513/.533, TCI 3500, 3.91 gears, all ARP fasteners,
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Re: Can't get rid of a miss!!! Help!
[Re: 68 Roadrunner]
#724816
06/15/10 12:13 PM
06/15/10 12:13 PM
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Joined: Jan 2005
Posts: 1,527
minnesota
Kirby
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minnesota
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Eric- I've also had similar issues with my HemiCuda' project. Just got it running, backfiring and running like crap if I drove it(5 speed)- in the shop it ran okay, but not great. Went thru the carbs thinking they were the culprit- ran the same. I ended up putting a jumper wire to eliminate the Ballast, and it instantly ran better. My ballast had 1.75 ohms of resistance, and I'm putting a .8 MSD in it now. I'm running a chrome box, retrofitted dizzy with no vacuum advance, and a MSD Blaster coil. Without a ballast of some sort- I believe your coil will fail. (Maybe already fried it) I think if you test the wires that were connected to you ballast, you will see that one side holds 12V with key on, whether you are cranking the motor or not, and the other does not. If you have your ecu wired to the wrong one, you will not have enough power to your ignition, and thus you'll have weak spark. In a sense, it's like my problem, I was resisting the voltage to the ignition to a point where it would run- but had a very weak spark. Our problems seem similar- but I suspect we have 2 separate issues- Sent you a PM-
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Re: Can't get rid of a miss!!! Help!
[Re: Kirby]
#724818
06/15/10 12:33 PM
06/15/10 12:33 PM
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Joined: Mar 2010
Posts: 130
Marcell, MN
68 Roadrunner
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Thanks for all the suggestions! I got busy here at work and haven't had a chance to call you. I'm pretty sure the ecu is grounded good. I triple checked it and even ran another ground wire from the screw to another location. I will try to call later.
Eric
1968 Roadrunner 383 auto
.060 KB 400 domed pistons, Stealth heads, Torker intake, Holley 830, Lunati Voodoo cam 276/284, .513/.533, TCI 3500, 3.91 gears, all ARP fasteners,
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Re: Can't get rid of a miss!!! Help!
[Re: 68 Roadrunner]
#724819
06/15/10 01:28 PM
06/15/10 01:28 PM
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Joined: Mar 2010
Posts: 130
Marcell, MN
68 Roadrunner
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Quote:
Thanks for all the suggestions! I got busy here at work and haven't had a chance to call you. I'm pretty sure the ecu is grounded good. I triple checked it and even ran another ground wire from the screw to another location. I will try to call later.
Eric
I should add that I also put in a newer style alternator with 2 field wires. (but I am still using the original voltage regulator) if that makes any difference. I also have a new style small starter. Talking with Kirby I am 90% sure that is has something to do with my wiring...but I am not sure what to do to fix it!
1968 Roadrunner 383 auto
.060 KB 400 domed pistons, Stealth heads, Torker intake, Holley 830, Lunati Voodoo cam 276/284, .513/.533, TCI 3500, 3.91 gears, all ARP fasteners,
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Re: Can't get rid of a miss!!! Help!
[Re: 68 Roadrunner]
#724821
06/15/10 01:50 PM
06/15/10 01:50 PM
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Joined: Dec 2005
Posts: 1,495
Shelby mi.
JAKE68
pro stock
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pro stock
Joined: Dec 2005
Posts: 1,495
Shelby mi.
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Looking at the diagram it is exactly how it should be wired. Otherwize you have something wrong with your car wiring. If you have played with timeing played with jetting have you tried maybe there is something wrong with the mechanical part? Valves ,pushrods, compresion,possable bad lobe on cam, vacuum leak. It is not the ground on the box. That would not work at all without a ground. You need to start going over the basics.
JAKES AUTOMOTIVE
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Re: Can't get rid of a miss!!! Help!
[Re: ireland383]
#724822
06/15/10 01:57 PM
06/15/10 01:57 PM
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Joined: Mar 2010
Posts: 130
Marcell, MN
68 Roadrunner
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Quote:
I know when i upgraded to the Mopar electronic ign. kit it came with an electronic VR. Are you saying you still have a points style regulator?
Yeah I am running the old points style VR.
1968 Roadrunner 383 auto
.060 KB 400 domed pistons, Stealth heads, Torker intake, Holley 830, Lunati Voodoo cam 276/284, .513/.533, TCI 3500, 3.91 gears, all ARP fasteners,
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Re: Can't get rid of a miss!!! Help!
[Re: JAKE68]
#724824
06/15/10 02:00 PM
06/15/10 02:00 PM
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Joined: Mar 2010
Posts: 130
Marcell, MN
68 Roadrunner
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Quote:
Looking at the diagram it is exactly how it should be wired. Otherwize you have something wrong with your car wiring. If you have played with timeing played with jetting have you tried maybe there is something wrong with the mechanical part? Valves ,pushrods, compresion,possable bad lobe on cam, vacuum leak. It is not the ground on the box. That would not work at all without a ground. You need to start going over the basics.
Why does it only have spark when cranking with it wired the "right way"??? If I can figure out how to get it started with it wired the "right way" I am assuming it will run better.
1968 Roadrunner 383 auto
.060 KB 400 domed pistons, Stealth heads, Torker intake, Holley 830, Lunati Voodoo cam 276/284, .513/.533, TCI 3500, 3.91 gears, all ARP fasteners,
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Re: Can't get rid of a miss!!! Help!
[Re: 68 Roadrunner]
#724825
06/15/10 03:22 PM
06/15/10 03:22 PM
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Joined: Dec 2005
Posts: 1,495
Shelby mi.
JAKE68
pro stock
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pro stock
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Posts: 1,495
Shelby mi.
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Sorry but that will only help in the starting it will not make it run better. Looking at the diagram again that was taken directly from the mopar race book. If you only have spark while cranking you have it connected to the wrong side of the ballast.Turn key on and with a test light see what side of ballast has power. That is the side you hook to. During crank the other side of ballast provides full battery voltage to coil and not resited voltage. Still if you have gotten your car to run even on full voltage it will not effect the running. The resister is only to cut voltage to coil to make it run cooler but during cranking it needs full voltage otherwise the starter drops available voltage too low and you will not get adequate voltage to coil.
Last edited by JAKE68; 06/15/10 05:46 PM.
JAKES AUTOMOTIVE
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