Car Not Starting When Jumped, Car Not Starting When Jumped (6 Reasons a Jump Start Fails), KevweAuto

Car Not Starting When Jumped (6 Reasons a Jump Start Fails)

Spread the love

Jump starting a car with a dead battery is a common remedy for a no-start situation. But sometimes even hooking up jumper cables and applying an external boost doesn’t get the engine firing up again. There are several potential causes behind why a jump start isn’t successful. Methodically working through diagnostic steps and repairs can get you overcome issues and get you rolling under your own power again.

Reasons a Jump Start Fails

Car Not Starting When Jumped, Car Not Starting When Jumped (6 Reasons a Jump Start Fails), KevweAuto

Here are some of the most common causes leading to unsuccessful jump start attempts:

1. Faulty Alternator

  • Cannot recharge battery after initial start
  • Dead battery keeps draining once jump source removed

2. Loose Battery Terminals

  • Restricted power flow from poor connections
  • Intermittent contact results in stalling

3. Excessive Parasitic Draw

  • Current leaks drain battery after jump start
  • Faulty components like lights staying on drain power

4. Mechanical Seizing

  • Seized engine components prevent cranking
  • Immobilized pistons or bearings won’t allow start

5. Depleted Fuel Supply

  • Out of gas provides insufficient fuel for firing
  • Pump or filter failure causes fuel starvation

6. Damaged Starter Motor

  • Failed windings, solenoid, or connections prevent cranking
  • Stuck brushes, gears or flywheel don’t engage properly Pinpointing the specific problem allows applying the appropriate remedy.
READ ALSO  How To Charge Hyundai Sonata Hybrid Battery? [Full Guidelines]

Step-by-Step Diagnosis and Repair Process

Follow this systematic process to diagnose and repair no-start issues when jump starting fails:

1. Inspect Battery and Terminals

Car Not Starting When Jumped, Car Not Starting When Jumped (6 Reasons a Jump Start Fails), KevweAuto
  • Load test battery to verify adequate charge capacity
  • Clean corroded terminals and tighten connections
  • Check voltage at posts with engine cranking should be over 10V

2. Check Starter Function

  • Listen for click or whine when engaging starter
  • Tap starter with mallet to free stuck component
  • Bypass ignition circuit at starter relay to test

3. Gas Level and Pump Operation

Car Not Starting When Jumped, Car Not Starting When Jumped (6 Reasons a Jump Start Fails), KevweAuto
  • Confirm sufficient fuel in tank
  • Check for cracked, damaged fuel lines
  • Listen for pump whine when key turned to “on”

4. Test for Parasitic Draws

  • Remove positive cable and insert ammeter
  • Draw should be less than 50mA when off
  • Pull fuses to isolate draw source

5. Check for Mechanical Binding

  • Rotate crank pulley by hand to feel binding
  • If no movement, breaking gripping force may be required

Preventative Maintenance Helps Avoid Issues

Routine upkeep goes a long way towards minimizing no-start situations:

Car Not Starting When Jumped, Car Not Starting When Jumped (6 Reasons a Jump Start Fails), KevweAuto
  • Regular battery testing and replacement at 3-5 years max
  • Keep battery posts and clamps clean, tight, and corrosion free
  • Address minor electrical problems early before they worsen
  • Maintain clean fuel supply free of contamination
  • Stay on top of tune ups, oil changes, and repairs
  • Upgrade old starter components once showing signs of wear

Proper care maximizes the chances your engine fires up when you need it.

Alternative Starting Methods

Car Not Starting When Jumped, Car Not Starting When Jumped (6 Reasons a Jump Start Fails), KevweAuto

If a jump fails, here are two other starting techniques to try:

1. Push or Roll Start

  • Put in gear and push until starts moving
  • Pop clutch with ignition on to crank engine
READ ALSO  Does Running Ac In Car Drain Battery?

2. Battery Swap

  • Disconnect old battery and install fully charged replacement
  • Match battery voltage/type to original
  • Recharge original battery later if applicable

These methods can confirm if the underlying issue is battery/electrical related or something more mechanical. But they should only be short term remedies until the root cause is fixed.

Conclusion

While jump starting a stubborn engine often works, sometimes a battery boost isn’t enough to get it going again, usually when it is an old battery or damaged battery. Methodical troubleshooting and repair guided by a qualified technician provides the best means to carefully determine and correct the underlying problem. With a properly operating electrical system, sufficient fuel supply, and freed mechanical linkages or faults, your car should roar to life when jumped. Stay proactive with maintenance for worry-free driving whenever you turn the key.

Ejenakevwe Samuel

I'm Ejenakevwe Samuel, and my blog is all about sharing the love for cars. Through my blog, I pour my heart into educating fellow car enthusiasts in everything they need to know about their beloved rides. Whether it's driving tips, maintenance tricks, or the latest trends, I aim to empower others to make informed decisions and take care of their vehicles like a pro.

Leave a Reply