Why won't my Ford Bronco II restart when it's hot, or why did it quit?

Short answer: On the Bronco II, the usual first suspect for a hot no-restart is the TFI ignition module on the distributor, which owners say can quit when hot and come back after it cools. It's a quick swap. Before buying one, check that the coil gets power in both Run and Start, that the fuel pump primes, and that the computer's ground and the fuel inertia switch are OK.

Symptom: It runs fine, but after a short stop it won't restart for 10 to 15 minutes. Or it surges, quits while driving and won't fire again.

What to check first

1. Listen for the fuel pump to hum for a second or two when you turn the key on.
2. Check spark when it won't start (a cheap spark tester works).
3. Check the coil has power in both Run and Start. A worn ignition switch can drop one of them.
4. Check the fuel inertia switch (a reset button that cuts the pump after a jolt).
5. Check the computer ground behind the right kick panel and clean it if corroded.

Likely causes

1. TFI ignition module failing when hot. Owners and members named it first; one said it's about a 5-minute swap.
2. No coil power from a worn ignition switch. Suggested in the 1985 thread.
3. Bad computer ground. A member pointed to the ground behind the right kick panel when the injectors lost their pulse.
4. Tripped fuel inertia switch or weak pump. Worth checking before parts.

What it usually costs

No owner posted prices. A TFI module is a common, moderately priced part.

Is it safe to keep driving?

A truck that quits while driving can strand you or cause a crash. Get it fixed before highway trips. Verify with a mechanic.

DIY or shop?

DIY for most of this. The TFI module, ground and inertia switch are owner-friendly; ignition switch work is fiddlier.

Recalls, bulletins and complaints in plain words

• Related recalls: NHTSA lists these recalls touching this area of the Ford Bronco II: 85V116000 (1986-1986 model years, electrical system); 85V130000 (1986-1986 model years, fuel system, gasoline); 87V139000 (1986-1987 model years, fuel system, gasoline). Check your VIN at nhtsa.gov/recalls. If your car is part of this recall, the dealer fixes it for free.
• Plain words: On 1986–1987 Bronco IIs, recalls covered damaged engine computer wiring insulation (85V116000), cracking nylon fuel return lines (85V130000) and fuel line couplings that may not be fully locked (87V139000). If you smell gas under the hood, don't drive it until it's checked. Verify with a mechanic.
• NHTSA complaints: 56 keyword-matched complaints for Ford Bronco II 1984–1990 (of 205 unique complaints queried, NHTSA complaints API by model year, queried 2026-10-26; keywords: stall, dies, no start, ignition module, TFI, hot, fuel pump, power). This counts complaints that mention these words. It is not a defect finding.

What owners report

• In Restarting 1988 Bronco II on Car Talk, the owner said the truck wouldn't restart for 10 to 15 minutes after a short stop. Members said the TFI ignition module can open up when hot and is about a 5-minute swap, and suggested checking that the fuel pump primes.
• In 85 Bronco II problem on Car Talk, a Bronco II surged, then quit and wouldn't fire. Members suggested a carb-cleaner test to tell fuel from spark, the TFI-IV module, and checking that the coil gets power in both Run and Start, which can point to the ignition switch.
• In Bronco II loses computer pulse to injectors on Car Talk, members pointed to the TFI module, the computer ground behind the right kick panel, and the fuel inertia switch.

Quick tip

Carry a spare TFI module if your Bronco II has the hot-restart habit. But check the ground and coil power first, because a new module on a bad ground fails the same way.

Vehicle focus: 1984–1990 Ford Bronco II (2.8L and 2.9L V6).

Safety / mechanic note

Stalling at speed is a crash risk. A shop can heat-test the module to confirm. Verify with a mechanic.