Why does my International Scout stall when hot, or start and then die?

Short answer: If your Scout starts and dies the moment the key goes back to Run, check the ballast resistor (the part that cuts coil voltage once the engine runs). On points-ignition Scouts, the Start position bypasses it, so a burned or jumped resistor kills the engine in Run. One 1961 Scout 80 owner found the resistor had been jumped. Members warned that this always burns the points. If it stalls when hot and won't restart until cool, suspect the coil first, then vapor lock.

Symptom: It starts and runs, then stalls when it gets hot and won't restart until it cools. Or it fires while you hold the key in Start and dies as soon as you let go.

What to check first

1. Check for power at the coil's positive terminal in both Run and Start.
2. Look at the ballast resistor and its wiring. A jumper around it is a red flag.
3. Inspect the points. If they're burned or welded shut, it won't run.
4. When it stalls hot, check for spark right away. Cooling the coil with compressed air is a quick test.
5. Try the cool-the-fuel-line test for vapor lock, and check rubber fuel lines for soft, gummy spots from ethanol.

Likely causes

1. Ballast resistor burned or bypassed. The 1961 owner found a jumper around it. A member said that will always burn the points.
2. Ignition coil failing when hot. A member's first guess for the 1978 Scout that stalled hot.
3. Vapor lock. Fuel boiling in the line on a hot day, worse with ethanol fuel.
4. Burned points and condenser. Likely damaged if the coil got full voltage for long.
5. Ethanol-damaged carb parts or fuel lines. Several members said old Scouts don't tolerate ethanol well.

What it usually costs

No owner posted prices in these threads. A ballast resistor, points, condenser and coil are cheap parts. A carb rebuild kit costs a little more.

Is it safe to keep driving?

Stalling on a hot day can leave you stuck in traffic. Don't plan long summer drives until you've found the cause. Verify with a mechanic.

DIY or shop?

Very DIY-friendly. Scouts are simple trucks. A test light, a set of points and a carb kit cover most of this.

Recalls, bulletins and complaints in plain words

• Recalls: NHTSA's recall lookup returned an error for the International Scout for 10 model-year queries on 2026-10-27, so we couldn't confirm recalls here. Check your VIN at nhtsa.gov/recalls. If your car is part of a recall, the dealer fixes it for free.
• Plain words: No recall we found matches this problem, so it's a normal repair, not a free recall fix. Still run your VIN, since other recalls may be open.
• NHTSA complaints: 0 keyword-matched complaints for International Scout 1971–1980 (of 2 unique complaints queried, NHTSA complaints API by model year, queried 2026-10-27; keywords: stall, dies, no start, cut out, idle, hot, fuel pump, hesitation) (NHTSA returned no complaint data for 9 model-year queries). This counts complaints that mention these words. It is not a defect finding.

What owners report

• In 78 International Scout that won't start when it is hot on Car Talk, an owner's Scout II stalled once hot, or wouldn't restart after a short stop, until it cooled. One member guessed the ignition coil and suggested cooling it with compressed air next time. Another suggested vapor lock, especially with ethanol fuel, and a cool-the-fuel-line test.
• In 61' Scout, Starts and immediately dies... It ran fine yesterday! on Car Talk, a 1961 Scout 80 started and then died. A member said that when it catches and then quits as you release the key, the ballast resistor may be burned out. The owner found the resistor had been bypassed with a jumper and put it back in the circuit. Another member warned that jumping the resistor always burns the points and they may weld shut. Others warned about ethanol damage to old fuel lines and carbs. The owner was rebuilding the carb, and no final result was posted.

Quick tip

On a points-ignition engine, 'runs in Start, dies in Run' is almost always the resistor circuit. Check it before you touch the carb.

Vehicle focus: 1961–1980 International Harvester Scout 80, 800 and Scout II.

Safety / mechanic note

Don't jumper the ballast resistor to keep it running. It burns the points and can overheat the coil. Verify with a mechanic.