Why is my Volvo 240 hard to start when it's warm or cold?

Short answer: When a 240 is hard to start hot, the usual suspects are leaking fuel injectors, a leaking fuel pressure regulator or a weak fuel pump; fuel seeps or boils off and the engine floods or starves. When it starts and then dies on cold mornings, the coolant temperature sensor that tells the computer the engine is cold is a common culprit, especially the hard-to-reach two-wire one under the intake. Long cranking can also come from a weak battery or a parasitic drain.

Symptom: Hot: it cranks but struggles to fire after a drive and you need to hold the gas pedal down. Cold: it starts, idles high for a few seconds and dies, then runs rough for minutes. Sometimes it cranks a long time or the battery is dead.

What to check first

1. Note when it happens: only hot, only cold, or both. That splits fuel leaks from temperature-sensor problems.
2. Hot-start trouble: pull the vacuum hose off the fuel pressure regulator and look for fuel in it. Look for fuel wetness around the injectors.
3. Cold-start trouble: have the coolant temperature sensor tested. Make sure the right one was replaced: the two-wire sensor at the back of the engine, under the intake.
4. Have the battery and alternator load-tested and ask for a parasitic draw test (measures what's draining the battery with everything off).
5. Have fuel pressure tested to check the pump.

Likely causes

1. Leaking fuel injectors. Members' first guess for warm-start trouble. External leaks are a fire risk.
2. Leaking fuel pressure regulator. Fuel in its vacuum hose means the diaphragm is leaking.
3. Bad coolant temperature sensor. If it reads warm when the engine is cold, the engine gets too little fuel and dies.
4. Weak fuel pump. Can let fuel vaporize when hot.
5. Weak battery or parasitic drain. Slow, long cranking makes every other problem worse.

What it usually costs

One owner said a Volvo dealer charged $100 for a diagnosis that didn't find the battery drain, and quoted $300 for a cold-start part it couldn't source. No other repair costs were posted.

Is it safe to keep driving?

Usually yes if it runs normally once started, but stalling at intersections is a hazard. If you smell gas or see fuel around the injectors, don't drive it; get it towed. Verify with a mechanic.

DIY or shop?

DIY for the regulator hose check, the temperature sensor, and a basic battery drain test with a meter. These cars are simple, and members recommend 240 owner forums for help. Fuel pressure testing and injector work are easier for a shop that knows old Volvos.

Recalls, bulletins and complaints in plain words

• Recalls: NHTSA lists no recall for starting or fuel system problems on the Volvo 240 in the model years we could check on 2026-10-24 (the recall lookup returned an error for 7 model-year queries). Check your VIN at nhtsa.gov/recalls. If your car is part of a recall, the dealer fixes it for free.
• NHTSA complaints: 7 keyword-matched complaints for Volvo 240 1986–1993 (of 83 unique complaints queried, NHTSA complaints API by model year, queried 2026-10-24; keywords: stall, dies, shut off, won't start, no start, starter, hard start, fuel injector, fuel pump) (NHTSA returned no complaint data for 2 model-year queries). This counts complaints that mention these words. It is not a defect finding.

What owners report

• In Trouble Starting When Engine is Warm (1988 Volvo 240) on Car Talk, an '88 240 wagon started fine cold but struggled after a drive unless floored. Members suggested leaking injectors, a weak fuel pump or a leaking fuel pressure regulator, and one said to pull the regulator's vacuum hose and look for fuel.
• In Cold Start Problem - 1991 Volvo 240 on Car Talk, a '91 idled high for a few seconds and died on cool mornings. A member pointed to the two-wire coolant temperature sensor hidden under the intake. The owner replaced it, and the symptoms stopped.
• In Volvo 240 Starting Problems on Car Talk, a 1990 240 with 222,000 miles had an on-and-off battery drain and long cranking. Members asked for a parasitic draw test, battery and alternator tests and a compression check, and suggested pulling fuses one at a time to find the drain.

Quick tip

The 240 is simple, so start simple: when does it happen, hot or cold? That one answer usually points you to the right part.

Vehicle focus: 1986–1993 Volvo 240 (sedan and wagon) with the fuel-injected four-cylinder.

Safety / mechanic note

Fuel leaking around the injectors is a fire risk; don't drive it. Verify with a mechanic.