Why does my Buick Reatta die when warm, or not start at all?

Short answer: If your Reatta runs about 15 minutes, dies and won't restart until it cools, members said to check for spark and fuel pressure right when it fails. The two usual heat-sensitive suspects are the ignition control module and the crankshaft position sensor, and a member described warming each one with a hair dryer on a cold engine to see which kills it. If it won't start at all and the problem is the VATS key (the resistor chip in the key), that's a different system.

Symptom: It starts and runs fine for about 15 minutes, then stalls and won't restart until it cools down. Or it won't start, and the problem seems to be in the anti-theft key system.

What to check first

1. When it dies, check for spark while cranking.
2. Have fuel pressure checked at the same moment.
3. Heat test on a cold engine: warm the ignition module, then the crank sensor, with a hair dryer or heat gun and see which makes it stall.
4. Check the coil pack if there's no spark.
5. If you suspect VATS, look for a flashing security light and have the key and its resistor checked.

Likely causes

1. Ignition control module failing when hot. One of the two parts members named for this symptom.
2. Crankshaft position sensor failing when hot. The other usual suspect.
3. Coil pack. A member said a dead coil pack is likely if there's no spark.
4. Weak fuel pump. A member said a failing pump can act this way too.
5. VATS anti-theft system. One owner's car got no signal from the VATS module to the computer.

What it usually costs

No owner posted prices.

Is it safe to keep driving?

Dying in traffic is dangerous. Avoid long or fast trips until you find the cause. Verify with a mechanic.

DIY or shop?

DIY for spark and heat tests and the coil pack. Crank sensor and VATS repairs are usually shop work.

Recalls, bulletins and complaints in plain words

• Recalls: NHTSA lists no recall for stalling, starting or ignition on the Buick Reatta in the model years we could check on 2026-10-26 (the recall lookup returned an error for 1 model-year queries). 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: 8 keyword-matched complaints for Buick Reatta 1988–1991 (of 52 unique complaints queried, NHTSA complaints API by model year, queried 2026-10-26; keywords: stall, dies, no start, ignition, hot, fuel pump, VATS, key). This counts complaints that mention these words. It is not a defect finding.

What owners report

• In 1990 Buick Reatta stalls and dies on Car Talk, a Reatta ran about 15 minutes, then stalled and wouldn't restart until it cooled. Members said to check for spark and fuel pressure when it fails, and named the coil pack, the ignition control module and the crankshaft position sensor, describing a heat test with a hair dryer on a cold engine. Another member said a failing fuel pump can act the same way.
• In 1990 Buick Reatta trouble starting on Car Talk, a Reatta owner said the key signal reached the VATS module but nothing went from VATS to the computer, so it wouldn't start. A member said the VATS module had likely failed and that parts are hard to find for a car this old.

Quick tip

Heat problems hide once the car cools. Carry a spark tester, and test the moment it dies.

Vehicle focus: 1988–1991 Buick Reatta (3.8L V6).

Safety / mechanic note

Use care with heat guns near wiring and fuel lines. Verify with a mechanic.