Dart dies when hot???

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NJDart

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Engine -360/Holley Street Dominator vac sec/MSD 6Al/Accell coil/MP distributor
727
I had a problem with car idling high after it warmed up, shop took care of this, hooked up the electric choke.
Picked it up today, started up no problem drove it about 5 miles. Got on the gas a little and it went flat and stalled. Got it started again but it wouldn’t run when you stepped on the gas. Tried a few times each time it would start right up idle fine but die when you tried to drive. Stuck on he side of the road for an hour it cooled down then started and drove fine back to the shop. Shop thinks it’s a coil problem. It’s weird it starts and idles fine but when hot dies in gear?! Thoughts??
 
NJDart said:
Engine -360/Holley Street Dominator vac sec/MSD 6Al/Accell coil/MP distributor
727
I had a problem with car idling high after it warmed up, shop took care of this, hooked up the electric choke.
Picked it up today, started up no problem drove it about 5 miles. Got on the gas a little and it went flat and stalled. Got it started again but it wouldn’t run when you stepped on the gas. Tried a few times each time it would start right up idle fine but die when you tried to drive. Stuck on he side of the road for an hour it cooled down then started and drove fine back to the shop. Shop thinks it’s a coil problem. It’s weird it starts and idles fine but when hot dies in gear?! Thoughts??
Click to expand...

Fuel filter/s
 
I had a similar problem and it was my coil getting to hot. My issue led me to a wiring issue in my bulkhead area. Dustin
 
NJDart said:
Stuck on he side of the road for an hour it cooled down then started and drove fine back to the shop. Shop thinks it’s a coil problem. It’s weird it starts and idles fine but when hot dies in gear?! Thoughts??
Click to expand...

Well, how old is the gas tank and has it been cleaned? I had a car some 480 moons ago and it would do the same thing, picked up garbage in the tank and made it's way up to the filter. Let it sit for a bit and drain back and it would run fine.

Coil will do the same thing except usually when you start it, it will go down the road again. Can be intermittent, you night go a mile, you might go 5, and so on. Coil, pick up coil in the distributor, one or the other.

I would check fuel first as that's kinda what it sounds like. Pull the coil wire, pull the fuel line and have someone turn it over a couple times so you can pump a bit of gas into a clean clear glass jar so you can see it.
 
Thanks for the replies.

The gas tank as far as I know is 50yrs old! I hand't thought of it but that's probably a good place to start. Most everything except the tank was replaced about 15 yrs ago (sender/fuel lines) and the cars has been garage kept but sat without running for quite a while until the last month or so. Today before I picked it up, the shop put a half tank in and then I added a few more gallons so very well could have stirred something up. The engine bay harness, distributor and coil were replaced 15yrs ago (car has only been drive maybe 1000 miles since) and the ignition box is new.

After it cooled down (under 160 coil/ignition box/carb all cool to touch) it ran ok back to the shop even under a load. I took it real easy maybe under 2k rpm the whole way, although it was surging a little at idle it never stalled. Once at the shop rev'd up in park no problem, power brake loaded it no problem but it was still under 190.

Also about 2wks ago I had it out for a while and it ran fine. The more I think about it crap in the tank or lines sounds like it. Today when it first happened I had got on it ~5-6k rpm when it died, probably sucked something up then.
 
Drain the front bowl and see what comes out.

But my thoughts are on the MSD/Accell coil partnership.
The MSD is a CDI system that outputs about 525volts into the coil.
That Accell coil, AFAIK, is a low voltage coil, wanting 8 volts running input.
I kindof think yur cooking the coil, below the Multi-strike cut-off point of around 3000 rpm.
CDI systems usually want E-Core coils, which are designed for the 500volt input and are able to deal with the multi-strike.
Think about this, that MSD, in multi-strike mode, can strike,IIRC, up to 20 sparks per cylinder, times 4 cylinder per revolution..... at 2000rpm that adds up to 2000x8/2x20=160,000 sparks per minute, at 3000 the math is 240,000 sparks per minute; I think Mr.Accell coil needs a nap from time to time,lol.

If nothing else; that coil will want to be mounted horizontally, in a cool airstream,not on the engine, and with the connecting studs facing down

Edited the math
 
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Just wonderin......you have a shop workin on it. How come you're askin us? I'd understand if you were doin it yourself. You gonna go back to them and tell them what somebody said on the internet? That might not go over too well.

I do agree though, it sounds like something electrical breaking down due to heat.
 
The shop thinks the coil is the problem too. The coil was part of an old Accell 300+ ignition I had in there. I was having problems starting/ running and I swapped the box for the MSD but left the coil. It worked much better with the MSD box until today although I really only drove it once. Coil is Accell #140019, intended for CDI I believe. Probably won't to replace it.
 
RustyRatRod said:
Just wonderin......you have a shop workin on it. How come you're askin us? I'd understand if you were doin it yourself. You gonna go back to them and tell them what somebody said on the internet? That might not go over too well.

I do agree though, it sounds like something electrical breaking down due to heat.
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Yes, I do have a shop working on it, first time in over 25yrs of owning this car just cause I don't have the time to mess with it right now but I still like driving it. I do trust the shop, guys a Mopar guy. No I'm not intending to go tell him the internet told me you should do this or that. But it is a bit of a mystery problem and I'd like to learn for myself what it could be and if anyone's had a similar problem, it may keep from me from sitting on the side of the road with the hood up for an hour next time. I appreciate everyone's responses and knowledge.
 
Mine did exactly the same thing last month finally just died, rebuilt carb, new fuel filter, went through everything, still didn’t fix it. I tested everything and finally found the coil didn’t test out right. Never had a coil go out, but having it sitting horizontal over intake, gets hot and it finally took a crap. Just grabbed a $5 mopar original from junkyard and it popped right off!
 
NJDart said:
Yes, I do have a shop working on it, first time in over 25yrs of owning this car just cause I don't have the time to mess with it right now but I still like driving it. I do trust the shop, guys a Mopar guy. No I'm not intending to go tell him the internet told me you should do this or that. But it is a bit of a mystery problem and I'd like to learn for myself what it could be and if anyone's had a similar problem, it may keep from me from sitting on the side of the road with the hood up for an hour next time. I appreciate everyone's responses and knowledge.
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Ignition coils and ignition control boxes can fool you sometimes. Normally, you think ignition as either off or on. But a coil or ignition box can fail in such a way that they simulate running out of fuel. Makes the engine not cut right off. Sometimes they can be difficult to diagnose, because by the time you jump out to get whatever to check it out, it's already cooled back off. Good luck with it.
 
yeah, that 140019 looks to be a matching HD E-core coil for CDI, and continuous use.
Is yours still wearing it's extruded aluminum heat sink?
Make sure your wiring will support the amp-draw of that system; I recommend a relay so you don't pull that all thru the ignition switch and more importantly;not thru the bulkhead connector.
Oh wait, I think that -6box has a built-in relay and the power module is wired straight to the battery, sorry.
 
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Update: New fuel tank going in this week. Pulled the filer and it was full of crap.
 
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