How to Jump Start E90: Proven Techniques for Reliable Performance
What To Know
- The battery in your E90 is typically located in the trunk, on the right side.
- Connect the other end of the red cable to the positive (+) terminal of the donor vehicle’s battery.
- Connect the other end of the black cable to a solid metal grounding point on your E90’s frame, away from the battery.
Your BMW E90 is a beautiful machine, but even the most reliable cars can fall victim to a dead battery. When that dreaded “click” sound greets you instead of the engine roar, don’t panic! This guide will walk you through the process of jump starting your E90, ensuring you get back on the road quickly and safely.
Why is My E90 Battery Dead?
Before we dive into the jump start process, let’s understand why your battery might have given up the ghost. Common culprits include:
- Leaving your headlights or interior lights on: This is a classic battery drain culprit.
- Leaving accessories plugged in: Don’t forget to unplug your phone charger, GPS, or any other devices left in your car.
- Extreme temperatures: Both extreme heat and cold can negatively impact battery life.
- Old battery: Batteries have a limited lifespan, and yours might simply be nearing the end.
- Faulty alternator: If your alternator isn’t charging the battery properly, it can lead to a dead battery.
Gather Your Gear
To jump start your E90, you’ll need the following:
- A set of jumper cables: Ensure they are in good condition and have insulated clamps.
- A working vehicle: This will be your “donor” car to provide the jump start.
- A pair of safety glasses: Always wear eye protection when working with car batteries.
- Gloves: Protect your hands from potential battery acid spills.
Safety First: Precautions Before Jump Starting
Safety should always be your top priority. Here’s what to keep in mind:
- Never smoke or allow open flames near the battery: Battery fumes are flammable.
- Wear protective clothing and glasses: Protect yourself from potential acid splashes.
- Don’t touch the battery terminals while the engine is running: This can cause a dangerous electrical shock.
- Disconnect the jumper cables in the correct order: Failure to do so can damage your car’s electrical system.
Jump Starting Your E90: Step-by-Step
Now that you’ve gathered your equipment and taken safety precautions, let’s jump start your E90:
1. Park the donor vehicle: Park the donor vehicle close to your E90, but ensure the vehicles are not touching.
2. Turn off both vehicles: Make sure the ignition is off in both cars.
3. Locate the battery: The battery in your E90 is typically located in the trunk, on the right side. Open the trunk and locate the battery.
4. Identify the terminals: The battery has two terminals: the positive (+) terminal and the negative (-) terminal. The positive terminal is usually marked with a “+” sign and the negative with a “-” sign.
5. Connect the positive (red) cable: Connect one end of the red cable to the positive (+) terminal of your E90’s battery.
6. Connect the other end of the red cable: Connect the other end of the red cable to the positive (+) terminal of the donor vehicle‘s battery.
7. Connect the negative (black) cable: Connect one end of the black cable to the negative (-) terminal of the donor vehicle‘s battery.
8. Connect the other end of the black cable: Connect the other end of the black cable to a solid metal grounding point on your E90’s frame, away from the battery. A common grounding point is the engine block.
9. Start the donor vehicle: Start the donor vehicle and let it run for a few minutes.
10. Start the E90: Attempt to start your E90. It may take a few tries for the engine to turn over.
11. Disconnect the cables: Once your E90 is running, disconnect the jumper cables in the reverse order you connected them. Start with the black cable, then the red cable.
Troubleshooting a Jump Start
If your E90 doesn’t start after following these steps, there might be a few issues:
- Dead battery: If the battery is completely dead, it may need to be replaced.
- Faulty starter: A faulty starter can prevent the engine from turning over.
- Other electrical problems: There could be other electrical issues preventing the engine from starting.
What to Do After a Jump Start
After successfully jump starting your E90, it’s important to take the following steps:
- Drive your car for at least 30 minutes: This will allow the alternator to recharge the battery.
- Get your battery checked: If the battery is old or has been repeatedly jump started, it might be time for a new one.
- Check your alternator: If your alternator is faulty, it will continue to drain the battery.
Time to Recharge: Your E90’s Battery Health
After jump starting your E90, it’s crucial to address the underlying cause of the dead battery. Here are some tips for maintaining your battery’s health:
- Regularly check your battery terminals: Corrosion can build up on the terminals, hindering the flow of electricity. Clean the terminals with a wire brush and baking soda solution.
- Avoid leaving your car idle for extended periods: If you’re not using your E90 for a while, disconnect the battery terminals to prevent it from draining.
- Consider a battery tender: A battery tender is a device that keeps your battery charged while it’s not in use.
Frequently Asked Questions
Q: How long can I leave the jumper cables connected?
A: It’s best not to leave the jumper cables connected for more than a few minutes. Prolonged connection can lead to overheating and damage to your vehicle’s electrical system.
Q: Can I jump start my E90 with a small car?
A: Yes, you can jump start your E90 with a smaller car as long as the donor car has a working battery with enough power to jump start your car.
Q: What if my battery is completely dead?
A: If your battery is completely dead, it may not be able to accept a charge from a jump start. You may need to replace the battery or have it tested by a mechanic.
Q: My E90’s battery keeps dying. What should I do?
A: If your battery keeps dying, it’s important to get it checked by a mechanic. There could be a problem with your alternator or another electrical component.
Q: Can I use a portable jump starter instead of a donor vehicle?
A: Yes, you can use a portable jump starter to start your E90. Portable jump starters are convenient and can be stored in your car for emergencies.
By following these tips and taking the necessary precautions, you can confidently jump start your E90 and get back on the road in no time. Remember, safety always comes first, and if you’re unsure about any of these steps, it’s always best to consult a professional mechanic.