Why did my Plymouth Reliant quit and not restart, or run rough and stall?

Short answer: If your Reliant quit with no spark at all and was fine hours later, a member said to have someone trace and clean the ignition wiring and connectors instead of throwing parts at it. If it runs very rough and stalls until it cools, check the vacuum line to the MAP sensor, since a broken one was found on a similar K-car. If it won't start in damp weather, clean the coil's high-voltage tower and look for a carbon track.

Symptom: It runs rough for a second and quits, with no hint of spark, then starts fine hours later. Or it starts rough and stalls and won't restart until it cools. Or it cranks normally but won't start, mostly in damp weather.

What to check first

1. When it quits, check for spark right away.
2. Unplug, inspect and clean ignition connectors along the wiring.
3. Check the small vacuum hose to the MAP sensor for cracks or a break.
4. Read the flash codes with the key ON-OFF-ON-OFF-ON.
5. Clean the coil tower and look for a black carbon track; damp weather makes a tracked coil fail.

Likely causes

1. Bad wire or dirty connector in the ignition circuit. A member's advice for a no-spark quit that cures itself.
2. Broken vacuum line to the MAP sensor. Found on a similar car that ran rough and stalled.
3. Coil tower dirt or carbon tracking. Suggested for damp-weather no-starts.

What it usually costs

No owner posted prices. One member said paying for an hour of wiring diagnosis beats throwing parts at it.

Is it safe to keep driving?

A car that quits on the road without warning can strand you or cause a crash. Verify with a mechanic.

DIY or shop?

DIY for vacuum lines, flash codes and coil cleaning. Tracing intermittent wiring faults is often worth a shop's hour.

Recalls, bulletins and complaints in plain words

• Related recalls: NHTSA lists these recalls touching this area of the Plymouth Reliant: 84V147000 (1984-1985 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: Recall 84V147000 covered fuel leaks at the engine-bay fuel reservoir on 1984–1985 models. It's about leaks, not quitting. If you smell gas under the hood, don't drive it until it's checked. Verify with a mechanic.
• NHTSA complaints: 12 keyword-matched complaints for Plymouth Reliant 1981–1989 (of 49 unique complaints queried, NHTSA complaints API by model year, queried 2026-10-26; keywords: stall, dies, no start, cut out, idle, hot, spark, ignition). This counts complaints that mention these words. It is not a defect finding.

What owners report

• In 1984 Plymouth Reliant quit on road, hours later OK on Car Talk, the car ran rough for about 2 seconds after an hour of slow driving on a warm day and quit with no spark at all. Years earlier a shop had replaced the ignitor for the same thing. Hours later it started and drove home. A member suggested a bad wire or dirty connector and said to pay an honest mechanic to trace and clean the ignition wiring.
• In K-car runs very rough and soon stalls on Car Talk, a 1989 Reliant with 170,000 miles suddenly ran very rough, stalled and wouldn't restart until it cooled. The owner had already checked timing, compression, spark and fuel. One member pointed to the vacuum diagram; another said a broken vacuum line to the manifold pressure (MAP) sensor caused the same thing on a Plymouth Caravelle, probably the same engine.
• In Problem with 1989 Plymouth Reliant on Car Talk, a low-mileage Reliant intermittently failed to start, mostly in damp weather. A member said to clean the coil's high-voltage tower and check it for a carbon track.

Quick tip

On a K-car, the clues are cheap. Flash codes, a vacuum hose and a clean coil tower cover most of these stalls.

Vehicle focus: 1981–1989 Plymouth Reliant (2.2L and 2.5L four).

Safety / mechanic note

Stalling in traffic is a crash risk. Verify with a mechanic.