Engine/ Carburetor/ Fuel/ Diagnosis Help needed

Robert Gambotz

Robert Gambotz

Member
I'm looking for advice or past experiences anyone has had for possible cause and solution for My 1973 Buick Electra225 Custom with a (76 Buick) Quadrajet M4 MC 7056244 800 cfm (Automatic Choke) After motor starts it automatically stops ?
I've had the front sitting on Jack Stands with wheels supported for about a month so that I can allow any air trapped in cooling passageways to make its way out of the engine and escape from my Radiator being that I have changed the Antifreeze, Flushed my Radiator, changed Thermostat due to a Weak flow with coolant.
But this is a NEW PROBLEM.
I've previously installed new Fuel filter, and I should be between half to 3/4 Full Tank of gas (93 Octane)
It won't run on any lesser Octane.
FYI I don't drive the car, only moved a few times within the vacant lot adjacent to where I park
 
Solution
Robert Gambotz
Bob said:
OK, someone has changed that, I believe it should have been points until '74.
It is still kind of the same, you are almost certainly having a problem with the circuit from the key.
You should use the 1975 wiring diagrams and diagnosis, CLICK HERE
Click to expand...
I REALLY APPRECIATE ALL OF YOUR EFFORT SIR
THANK YOU VERY MUCH
I will reply as soon as problem is resolved with the cause and solution
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You have a carburetur, if it sits more than 5 days, the fuel evaporates out of the bowl. You can use starting spray to provide priming for dry spells. Why some people install an electric in place of mechanical fuel pump. Assuming that there is a fuel pump providing 5-7 psi of fuel for carb. Assuming no water contamination in fuel or carb bowl contamination, corroded pump spring, check ball, etc. Cranking eventually will start it. You should learn how to clear up flooding, too much fuel. The owners manual has amazing instructions on starting car. Few pictures though.
 
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You are not getting voltage to the coil with the key in the run position. There should be two wires connected the + side of the coil.

You can find the ignition system description and diagnosis CLICK HERE

You can download the wiring diagram CLICK HERE then open it on your computer to trace the electrical from the coil to the key.
 
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OK, someone has changed that, I believe it should have been points until '74.
It is still kind of the same, you are almost certainly having a problem with the circuit from the key.
You should use the 1975 wiring diagrams and diagnosis, CLICK HERE
 
Upvote 0 Downvote
Bob said:
OK, someone has changed that, I believe it should have been points until '74.
It is still kind of the same, you are almost certainly having a problem with the circuit from the key.
You should use the 1975 wiring diagrams and diagnosis, CLICK HERE
Click to expand...
I REALLY APPRECIATE ALL OF YOUR EFFORT SIR
THANK YOU VERY MUCH
I will reply as soon as problem is resolved with the cause and solution
 
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