Stop in for a cup of coffee
- Thread starter toolmanmike
- Start date
-
PosiRon
Hey, technically it's an A-Body
Yeah I'm offa here too - gotta go heat Ray's garage, then do some FERD work since my Chebby has gone to WV for prep and paint. I guess that makes me pretty much a complete infidel.
zkx14
Duster De-ruster
Just put the battery charger on since I figured it was low after last time trying to start and tested the resistor on the car. My fingers are cold! Back in for last cup of coffee...
So FWIW. I went up to NAPA and got a resistor. 5.2 and 1.2 ohms. The one in the car is same. I tried to find the original in my parts boxes, but contrary to my tradition of being a packrat -I appears that I got rid of it and the ignition module. I did find the old cap and rotor...
Funny thing. Younger guy at the counter - Took 5 minutes and couldn't find the resistor on the computer BUT was able to walk back not 10 ft from the counter and find it on the shelf. Not the usual advance auto attitude that it doesn't exist if it ain't in the computer. (I did go to Napa online and it is in there and is correct/only possible one.) LOL
So FWIW. I went up to NAPA and got a resistor. 5.2 and 1.2 ohms. The one in the car is same. I tried to find the original in my parts boxes, but contrary to my tradition of being a packrat -I appears that I got rid of it and the ignition module. I did find the old cap and rotor...
Funny thing. Younger guy at the counter - Took 5 minutes and couldn't find the resistor on the computer BUT was able to walk back not 10 ft from the counter and find it on the shelf. Not the usual advance auto attitude that it doesn't exist if it ain't in the computer. (I did go to Napa online and it is in there and is correct/only possible one.) LOL
It ain't like the old days when you'd ask and the guy say "l think we got that, let me go back and LOOK"
Gosh. You want to know everything? What fun is that?
A couple wires are there to power the unit's electronics. One's on a resistor wire to keep voltage within acceptable range.
Another pair picks up the signal from the distributor's pickup.
Ground wire from coil.
Pulse from pickup to electronics -> grounds the coil. Coil secondary voltage releases through the spark plug. Boom.
Certainly getting rare. Of the chain stores, NAPAs tended to more like the independents that way.
When I was at Kragan, now O'reilys, I could find lots of stuff just by knowing where they were on the shelf. Relays, switches, stuff like that...Just by looking at the part
Y'all don't get me started on Auto Parts Stores... I was an Independent Parts Store Chain Owner for 28 Years...
Last edited:
goldfish65
Well-Known Member
On a side note, funny how they made so much fun of President Ford that he is mostly remembered as a clumsy oaf instead of for his integrity and service. And then Al Franken went into politics and will always be remembered for treating women badly while Ford was above that kind of behavior.
Everyone, even Presidents, have there strong points/ and weakness's. A Human trait!!
zkx14
Duster De-ruster
Just reading about it. So low side of resistor is bypassed in starting and reduces voltage to the coil in run. I guess if the car starts and shuts off immediately would be reason to suspect faulty resistor on low ohm side.
ECU is mostly just a transistor. The pickup in distrib is the base trigger for the transistor. The transistor complete the ground for the coil primary, timed by the reluctor. A bit confusing looking at the full wiring schematic in FSM trying to follow circuit not quite sure of the path for supply voltage to the controller. So still not sure if the 5 ohm resistor is required to power the controller during start.
I'm not sure about the power supply. At some point, Chrysler stopped using the fifth pin in the connector and I don't know what the reason was. My guess is that they put a current limiter into the magic box. The guy who goes by NachoRT on Moparts and a few other B body forums may know. I'm pretty sure he was opening them up to look inside and replace parts. I'll see if I can find the thread.edit: Here. A lot of pictures missing
ECUs are definitivelly SERVICEABLE! | Moparts Question and Answer | Moparts Forums
Same here but some are still there some after page 1.
Working on fix ECUs... AND FIXING WITH SUCCESS!!!
Good brain excercise LOL where's Dave?
Last edited:
Ddaddy
Just doing what I do
They switched to the 4 pin ECU box and single ballast resistor in the 80s. The later ECUs had the start circuit combined inside the ECU & no longer needed the extra ~5 ohm half of the "dual" ballast.
This is also why I said don’t ignore the ECU as the source of ignition problems. They fail all the time and are hard to test. I carry at least one spare all the time.
This is also why I said don’t ignore the ECU as the source of ignition problems. They fail all the time and are hard to test. I carry at least one spare all the time.
Hello Mc fly!
Not hard stop over engineering it and change the dam distributor or I want it back Monday! Seriously Chris!!!!!!
OK how did it work out or are you still in the books?
So?
So?
Ddaddy
Just doing what I do
So and so?
So?
And thennnnn
Ddaddy
Just doing what I do
And then the salesman said...
zkx14
Duster De-ruster
New diz in...and out and in out. Old back in, out, in. I quit for the day. Battery running down -back on charge.
Tried turning 180couple times, still nothing. I don't get it.
I think the coil may be a problem. I put volt meter on primary and cranked it over. Cant actually read volts but could see it jumping. Put a plug in and just laying there it sparks, but maybe too weak? So checked resistance and secondary has over 10K - OK. Primary 1.8ohms, over 2x what that pic showed.
Ddaddy
Just doing what I do
ECU box.New diz in...and out and in out. Old back in, out, in. I quit for the day. Battery running down -back on charge.
Tried turning 180couple times, still nothing. I don't get it.
Ok it is home! Drove it down to Max's and back
-
