Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
No start/hard start, engine cold or hot:
tayto:
confirm battery voltage @ 12v plug at distributor
fussfeld:
--- Quote from: Kenth on July 06, 2021, 07:17:13 AM ---There is no room for assumtions.
A weak ignition system is a good recipe for hard starts and a poorly running engine.
You need to check and verify the ignition system ahead of adjusting the carb.
--- End quote ---
Pls see below:
fussfeld:
--- Quote from: tayto on July 07, 2021, 11:04:46 AM ---confirm battery voltage @ 12v plug at distributor
--- End quote ---
Note: i don't know the EXACT numbers (because i didn't write them down---lesson learned) but they are close.
Battery sitting = 12.56
Battery while cranking = 11.50 ish
Voltage at red/ ignition wire with key "on" = 12.56
Voltage at red/ ignition wire while cranking = 10.8 ish. Is this good enough for HEI to start engine?
73ss:
Sounds about normal. factory HEI setup or originally points?
tayto:
2 Volts is a lot IMO. Could be a voltage drop in the ignition switch. If you are careful you can take apart and clean the contacts. I use contact cleaner only, do not sand the contacts. I've even got lucky just spraying contact cleaner in the switch and working it.
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