Still having miss fire problems---

[playswithcars]

Car is 64 Impala SS with '74 350 and TH350 with HEI dist. As instructed before, I
removed the ballast resistor and connected the hot wire from the ign switch to
the wire running to the hot side of coil. The diiference was like day and night but it still misses and breaks down (pops thru carb) under heavy load, 1/2 throttle of more. I am convinced I DO NOT have full 12 volys from ign to dist. I read something of another resistance wire under the dash but thought that was only for gauges.

How and what can I wire it so I get full battery power to dist coil? Where would I
test to see if full power is available? :bang

Thanks again for any help. I just feel so stupid trying to resolve this issue. :scratch

[bobs409]

On my 69 Chevy truck, I have a heavy gauge wire that runs from the "ignition fused" terminal on the fuse block out to the distributor.

You'll get a full 12 volts from there.

[mpris]

Just hook up a voltmeter to the hot wire to the HEI. While the car is running see how much voltage you have at this point. On a regular distributor I believe you should have approximately 10 volts without a resistor. I am not sure of what you have at that point in the circuit with a HEI. Make sure the wire going to the HEI is at least 12 gauge . The HEI distributor uses more current that a conventional distributor and if the wire is too small it can cause misfires. If your car had a ballast resistor on the firewall, it should not have come with a resistor wire in the harness.

Poocho

[playswithcars]

Thanks guys.

Yes, it has a ballast resistor on the firewall and the lead from the ign switch did
go to one end and the other end to the dist. I bypassed that as directed and it improved greatly but still not right.

I'll check out the fuse panel and heavier gage wire.

[Old School]

Try putting a 12 ga jumper wire from the battery to the coil and see clears up. If not, you need to look elsewhere. I had a similar problem last year and finally discovered it was a faulty coil.

[bobs409]

Yep, could be coil or even the control module. They act funny sometimes before they go.

One (or both, still not sure!) went on my truck. For the month prior to it/them going south, the truck would have hot start problems. It acted like it was flooded as I would have to crank and crank to get started.

Finally one day, it just would start no more and I replaced both coil and control module. Never had the problems since. (knock on wood) :p

[dq409]

I`m with Bob on this one.
Also check out the rotor contact. It is a carbon one and they can and will go bad.
IMO, The stock configuration of the HEI has too much heat build up under the cap. I like the remote mounted coil HEI for this reason.
They also look stock and fit better being a smaller stock type dist cap. ,,dq