Classic Mustangs (Tech)Technical discussions about the Mustangs of yester-year.
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I picked up at 65 with the original 289 engine. The car would not stay running. I rebuilt the carb replaced the water pump, fuel pump, wires, cap, rotor, plugs, coil, and points. New fuel tank and fuel line as well. Has the stock 4100 carb on it.
Son and I started her up and she ran great for 5 min then that was it. Runs ruff and cannot get it to stay running. While she was running she was purring and sounded great. She was burning a tad bit rich but was running great. I am running out or ideas of what to do next. What can cause it to run like crap after she warmed up? This is old school stuff and I am stumped.
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Thank you for the reply. Still not finding any vacuum leaks. Fuel going in. Car is all stock 65. Matching numbers and every thing. Point gap set at .021 plug gap set at .032 (will increase to .035) Will keep digging. Need to walk away from it for a few.
Did you check valve adjustment? It may be good when cold but too tight when hot with loss of compression.
Did someone replace the coil resistance wire with a standard wire. Coil may be over heating and shorting out even if new it needs a resistance wire.
Electric Choke? may have bad element causing choke to stay closed. Non electric may have plugged riser tube causing choke to stay closed.
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