Help!! - 3.7 volts at coil pos.(no hair left..)
My PITA continues..
I'm working on a 78 Dodge Class C Motor home with a 440/4bl motor.
I need to go camping before I lose my mind - or so I can find it....
Refering to my previous post; 440-dodge-weak-no-spark-wont-start
The motor was cranking, but showed little to no spark. At that time I was seeing 5.7. It turned out the problem was being caused by a bad distributor(and I mean bad).. I installed a new distributor and the engine appeared to fire up(I only let it catch a little because the wiring harness, etc. needed to be put back in place. I didn't need the fan catching a harness wire...)
When I looked at the distributor again it appears one of us moved it when putting the wires, cap, etc back in place. It was advanced about a quarter turn...so obviously the ignition was running at huge adv. Well, when I moved it back to TDC and tried to start it again, no go...just some light popping(not back fire.. just the sound of compression being pushed out a 'just opened' valve.) I decided to move the dist. back to the Adv. position again and turn it over.
It acted like it wanted to start, but doesn't actually fire...back to TDC I put it..
I went back to start doing some troubleshooting again and found that when I have the key in 'run' position(not 'start') I'm seeing 3.7 volts at the coil positive, and 1.7 at coil negative(with the ECU plugged in, and the battery shows 12.5v).
When the ignition is in 'start'(engine cranking strong) I'm seeing 10.7 volts at Coil positive(which I assume is correct since the starter relay boosts voltage during the start cycle)...
So I need some advice on my Low Voltage at Coil Positive.
Before the whole problem started I was seeing around 6v at coil positive, under the same conditions.
Doc - thanks for all your advice last time. But I guess I'm not done yet...
Just to mention;
1) I'm being told I should see no less than 6v(+/-) at coil positive to get a strong enough spark to run on...
2) After I 'thought' I had the thing running I added a MSD blaster 2 coil. I just received the replacement ECU harness from Summit and will be installing it tonight...
Thanks for looking..
Jump from the battery to the coil + and see if it will fire and run.
If it does, then the problem can only exist between the ballast resistor and the Ignition switch..
If it does not..your new Dizzy may be faulty (or not grounded)
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