Why does my Datsun 280Z bog down, or not crank after sitting?

Short answer: A 280Z that won't crank after sitting usually needs good battery cables and grounds. Make sure the engine turns by hand, then check the starter connections. If it starts but dies, give the fuel pump a few tries and try starting fluid. A bog when pulling away is a fuel injection question, so get the factory manual and test the system step by step.

Symptom: The car clicks but won't crank after sitting, runs only for a few seconds, or bogs when you ease into first.

What to check first

1. Charge and load-test the battery.
2. Clean the cables and check the engine and body grounds.
3. Turn the engine by hand with a wrench on the crank bolt.
4. Try starting fluid if it cranks but won't stay running.
5. For a bog, follow the injection tests in the factory manual.

Likely causes

1. Fuel injection problem. The 280Z is fuel injected, which surprises some owners. A bog when easing into first can come from a sensor, injector or throttle switch.
2. Bad cables or ground. After sitting, corroded battery cables or a bad ground keep the starter from turning.
3. Engine hard to turn after sitting. If the engine won't turn by hand, something is stuck and you shouldn't keep cranking.
4. Fuel pump lost its prime. After a winter, the fuel system may take a few tries to fill again.

What it usually costs

Owners in these threads didn't post prices.

Is it safe to keep driving?

A bog when pulling into traffic is a hazard. Fix it before relying on the car.

DIY or shop?

Cables, grounds and basic tests are DIY. Injection diagnosis may need a Z specialist.

Recalls, bulletins and complaints in plain words

• Recalls: NHTSA's recall lookup returned no data for the Datsun 280Z for 24 model-year queries on 2026-10-30, 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: The complaint count below shows how often owners reported problems that mention these words to NHTSA. A count is not proof of a defect.
• NHTSA complaints: 0 keyword-matched complaints for Datsun 280Z 1975–1978 (of 0 unique complaints queried, NHTSA complaints API by model year, queried 2026-10-30; keywords: stall, hesitat, bog, start, fuel, starter) (NHTSA returned no data for 24 model-year queries). This counts complaints that mention these words. It is not a defect finding.

What owners report

• In Troubleshooting 1977 Datsun 280Z on Car Talk, a 1977 280Z bogged down when easing into first gear, as if flooding or starving for gas. Members noted it's fuel injected, recommended a factory service manual, and said to find a Z-specific forum and learn how its injection system works.
• In 1978 Datsun 280Z on Car Talk, a 1978 280Z that sat all winter clicked but wouldn't crank, even with a new battery and cleaned cables; a jump got it running for only a few seconds. Members suggested turning the engine over by hand, checking the starter cables and ground, trying starting fluid, and giving the fuel pump a few tries to prime.

Quick tip

A Z-car club and a factory manual will save you more money than any part.

Vehicle focus: Datsun 280Z, 1975-1978.

Safety / mechanic note

Fuel and starting faults are safety items. Verify with a mechanic.