Fuel Injected Engine Hard To Start When Hot?

Why does my car start when it’s cold but not hot?

The cold starting issue could possibly be caused by a failing fuel pump or even a temperature sensor. Heat increases resistance in electrical circuits, and it is possible that once the fuel pump has been running for a while, high resistance causes it to slow or stop.

What causes hard cranking?

Fouled plugs are one of the most common reasons for a hard starting engine. This can lead to prolonged cranking before the engine will start. Clogged Fuel Filter: A fuel filter that is clogged can make a vehicle very difficult to start. The fuel filter screens out contaminants and can become clogged over time.

Why won’t my fuel injected car start?

Answer: The most common source of trouble when the engine cranks but won’t start is the ignition or fuel system. Make sure you got enough fuel pressure and good spark. Also, a faulty sensor (crankshaft position sensor or camshaft sensor on some models or throttle position sensor) may cause this problem as well.

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Why is it hard to start a hot engine?

1) What to do when a hot engine is hard to start? Most of the causes are fuel related problems. Fuel cannot circulate well due to the way in which vapor blocks it. As a result, the engine would not start as easily as it should.

How do you fix a hard start engine?

Here are the components in the order they operate when you insert the key.

  1. Step 1: Insert your key.
  2. Step 2: Starter pushes the flywheel or flexplate.
  3. Step 3: The engine turns over.
  4. Step 1: Start the car in Park.
  5. Step 2: Check the battery.
  6. Step 3: Check the starter.
  7. Step 4: Check the spark.
  8. Step 5: Check the fuel.

What can cause an engine not to start?

Car still won’t start?

  • Dead battery. A dead battery is the most common reason why a car won’t start.
  • Battery corrosion. Corrosion on your battery can spell trouble.
  • Bad starter motor.
  • Bad timing belt.
  • Broken or cracked distributor cap.
  • Bad ignition coil.
  • Clogged fuel filter.

How do I know when my alternator is bad?

7 Signs of a Failing Alternator

  1. Dim or Overly Bright Lights.
  2. Dead Battery.
  3. Slow or Malfunctioning Accessories.
  4. Trouble Starting or Frequent Stalling.
  5. Growling or Whining Noises.
  6. Smell of Burning Rubber or Wires.
  7. Battery Warning Light on Dash.

Why does my car die when it gets hot?

Well, there is an ignition problem that can cause this when the engine gets hot and it stalls. It’s caused by a lack of spark which can be either the ECU’s fault (on EFI cars), or the coil on pretty much any car. Heat causes expansion. An engine needs more fuel when it’s cold than it does when it’s warm.

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What causes an engine to crank slowly and not start?

Possible causes are a degraded or defective battery, faulty electrical connection, a charging system problem, a bad starter or battery rundown when parked. Sudden and unanticipated battery failures can also occur. A dirty battery terminal connection can also cause slow cranking and behave unpredictably.

Can a bad battery cause a hard start?

A dead battery is the No. 1 cause of a no-start. If the battery is weak, but not totally dead, the starter may turn slowly.

How do you diagnose a bad fuel pump?

Usually, a bad or failing fuel pump will produce one or more of the following 8 symptoms that alert the driver of a potential issue.

  1. Whining Noise From the Fuel Tank.
  2. Difficulty Starting.
  3. Engine Sputtering.
  4. Stalling at High Temperatures.
  5. Loss of Power Under Stress.
  6. Car Surging.
  7. Low Gas Mileage.
  8. Car Will Not Start.

Why would my car suddenly not start?

Dead battery



A dead battery is the most common reason why your car won’t start. While the vehicle is running, the alternator charges the battery. If the battery is not charged sufficiently, you will not be able to start the car or use any electrical components.

What can cause fuel injectors not to spray?

If it does not spray, the problem is the injector or no fuel pressure. The injector should have around 1.3 ohms of resistance, if it is open or zero resistance, it is bad. The injector could be totally clogged as well.

Why won’t my car start but battery is good?

Similar to the starter engine, a broken or damaged ignition switch can stop your car from starting. If your headlights can turn on, but your car won’t crank, that means that your battery is charged, but either the starter or ignition is the problem.

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