Ran, but now won't.

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Tuckerjr

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Hi guys. I recently replaced the head gaskets and a couple freeze plugs on my 74 dart sport 360 (leaky freeze plug finally got me). After starting the car and letting run a minute or so I had water dripping out of the driver side exhaust. Great, must still be a leak. I had my son come over (he helped me with the gasket install), to show him what it was doing. Fired it up and let him see the water in the exhaust.

So the next day we decided to take the header off the driver side to see if we can get a better idea of exactly where the leak is. Got it unbolted and slid back away from the engine as much as possible. Went to fire her up and it fires as long as I hold the key to start, dies when I release it to run.

I removed the number one spark plug wire, put an old spark plug in it and laid it on the intake. Turned the key to start and had a bright orange spark. Shouldn't this spark be blue? If so then maybe my coil is suspect. I will remove each spark plug one by one and test them this way, to see if they all have an orange spark.

Also several times it would not try to start at all, turn the key and nothing. We'd keep messing with it and eventually it would try to crank again. I will look for loose connections and grounds.

This car has an MSD 6al ignition, the ballast resistor was bypassed years ago.

Also, I need to get my multimeter out or a test light and check for voltage on the start and run wires of the ignition.

Can you guys think of anything else?
 
Hi guys. I recently replaced the head gaskets and a couple freeze plugs on my 74 dart sport 360 (leaky freeze plug finally got me). After starting the car and letting run a minute or so I had water dripping out of the driver side exhaust. Great, must still be a leak. I had my son come over (he helped me with the gasket install), to show him what it was doing. Fired it up and let him see the water in the exhaust.

So the next day we decided to take the header off the driver side to see if we can get a better idea of exactly where the leak is. Got it unbolted and slid back away from the engine as much as possible. Went to fire her up and it fires as long as I hold the key to start, dies when I release it to run.

I removed the number one spark plug wire, put an old spark plug in it and laid it on the intake. Turned the key to start and had a bright orange spark. Shouldn't this spark be blue? If so then maybe my coil is suspect. I will remove each spark plug one by one and test them this way, to see if they all have an orange spark.

Also several times it would not try to start at all, turn the key and nothing. We'd keep messing with it and eventually it would try to crank again. I will look for loose connections and grounds.

This car has an MSD 6al ignition, the ballast resistor was bypassed years ago.

Also, I need to get my multimeter out or a test light and check for voltage on the start and run wires of the ignition.

Can you guys think of anything else?

Sounds like the ignition switch, but it could be your wiring to or from it including the bulkhead connector.
If it cranks but doesn't start your neutral safety switch is working.
An orange spark isn't that uncommon, but out of an MSD I would think it would be blue.
Or at lease blue with some orange around it.

You could wire your MSD to have direct battery power to it's "ignition on" circuit to eliminate all the wiring, bulkhead and the switch just for a diagnostic.
If it runs like that you know you have a switch or wiring problem.
 
Condensation coming from the exhaust is normal and should dry up after warmup. Dis you pull the distributor along with the intake, could be a bad connection on reinstal
 
Thanks for the help everyone. I've got some stuff to look at when I get home. I'll check the distributor connection, it should be fine but who knows. This thing fired up and ran several times after the head gasket change, then all of a sudden it won't stay running. The condensation from the exhaust might be normal, it looked excessive to me though. The other tailpipe had very little if any compared to the drivers side. If I can get it to run again I'll take it for a spin and see if it clears up.
 
To hook up the MSD for testing and bypass the ignition do I just run the power and ground wires going to the MSD from the battery? Also, I forgot to mention in my previous post, that the last time I had it running I noticed my tach was not working, not sure if it is related in any way.
 
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