BMW 8 Series Wont Start? Here’s Quick Solutions to Most Common Problems

Introduction

As an experienced car mechanic with over two decades of experience, I’ve helped plenty of people battling when their BMW 8 Series Won’t Start. And let’s face it, not being able to start your car when you need to drive straight up sucks.

But keep your chin up, you’ve come to the right place, no need to keep googling searches like “BMW cranks but wont start“, I got you covered. My name’s Robby, a certified auto mechanic with over two decades of experience, and in this article, I’ll walk you through the frequent reasons for why your 8 Series struggles to start. I’ll discuss all the typical suspects so you can diagnose what’s going on, plus what to do to fix each specific problem. Drawing on my 20 years of personal experience, I’ll supply actionable troubleshooting tips to get your BMW 8 Series up and running as soon as possible!

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Why Won’t My a BMW Start?

BMW 8 Series wont start

Before we dive into the list of possible issues and solutions, it’s critical to first gain an understanding of the central issue. When you climb into your BMW 8 Series and realize “it won’t start!”, there could be multiple parts causing the headaches. Perhaps the engine doesn’t turn over whatsoever, or maybe it’s cranking but not firing. Or you might notice clicking sounds when you try to start it, but sadly no ignition occurs. Each scenario can indicate various problems under the hood.

Common Reasons Why Your BMW 8 Series Won’t Start

There are many contributing factors why your 8 Series won’t turn on. The usual suspects include a weak or drained battery, faulty alternator, starter motor complications, fuel system problems, plus electrical or wiring malfunctions. Each of these issues can present differently, needing specific methods of troubleshooting and fixing to get you driving again ASAP. All of which, we’ll delve into.

Symptoms of a BMW 8 Series That Won’t Start

Identifying these warning signs will lead you to the main issue. Take for example, when you turn the key and you hear it clicking but no ignition, it often means a fuel or ignition issue.

Analysis of The Reasons Why Your BMW 8 Series Won’t Start

The first step in remedying the no-start headache is understanding the precise source of the problem. So let’s explore the most common causes of the 8 Series failing to start when you turn the key.

Battery Issues in a BMW 8 Series

car wont start but battery is good
Image Credit: MechanicAnswer.com

In the vast majority of situations, the most common reason a BMW 8 Series won’t start comes down to battery troubles. Specifically, a weak or dead battery prevents the engine from turning over. The car’s battery supplies the required power to ignite the engine and activate all your electronics. Symptoms of a failing battery include sluggish or strained cranking, faint headlights, or a battery alert symbol aglow on the dash. A battery charger can recharge a drained battery if you don’t have the help of another vehicle to jump start it, but do have an electrical socket nearby like at home.  And a portable jump starter lets you charge p the battery without another vehicle, and by the roadside without the need for an electrical socket, so you are never stuck.

Alternator Problems in a BMW 8 Series

car wont start alternator

The Alternator keeps the battery juiced up by using engine power while driving. A busted alternator can easily stop your BMW 8 Series from starting since it fails to recharge the battery, depleting it fully so that one day you climb into your wheels and it simply can’t start. Clues of a problematic alternator can be a lit up battery or alternator caution light on its dashboard, faint headlights while idling, or a whirring noise from the engine while running.

Starter Motor Failures in a BMW 8 Series

car wont start wont turn over

The starter is crucial for cranking the engine when you go to start up your BMW. In the event of starter problems, the engine can’t crank, preventing your 8 Series from starting. Pay attention to clicking sounds when you turn the key or grinding while trying to start, which could indicate starter troubles.

Fuel System Issues in a BMW 8 Series

car wont start fuel filter

This isn’t about running out of gas like a silly goose. Instead, it’s problems in the fuel system itself potentially leaving your 8 Series unable to start. Your car uses gas uses fuel to combine with oxygen and powers the engine. So problems here like a clogged fuel filter or failing fuel pump relay may mean the engine lacking the fuel it needs to start. Fuel injectors can also get clogged over time, so consider a fuel injector cleaner like Red Line to clear any blockages and improve starting.

Electrical System or Wiring Problems in a BMW 8 Series

car wont start electrical issue
Image Credit: MechanicAnswer.com

Ok, well yes that image is a joke, but I want to emphasize modern vehicles rely on electronics, opening up what can go wrong. With older models, common culprits include blown fuses, spark issues, broken ignition switches, or broken sensors. Electrical issues and electronics like these can all prevent your vehicle from starting. Pay attention to your car only starting sometimes, dashboard alerts, or failure to crank as signs of an underlying electrical problem. Diagnosing and repairing these typically requires a certified mechanic near you.

Solutions: Let’s Get Your BMW 8 Series Starting Again!

If you think you might know what the issue may be, it’s time to figure out the reason behind your car’s starting failure, and then the next step is to try to mend the problem. Here are some tips for frequent problems we’ve covered thus far:

How to Identify and Fix Battery Issues in a BMW 8 Series

car not starting but battery is fine

The first step if a battery issue is suspected for the no start is to check the battery terminals. Make sure they are corrosion-free, secure, and correctly connected. If the terminals are in fact dirty, try cleaning them with a sodium bicarbonate(baking soda) and water mixture.

Once you have checked the battery terminals, you can check to see if the battery is just out of charge, or worse, it’s old and weak, or dead and needs to be replaced. For this, you can charge the battery in a few different ways:

If the battery charges fully and performs as expected, the issue may be resolved. However, replacing the battery will be required if it is old, weak or dead. Otherwise, even sufficiently charging it to start your 8 Series may only provide temporary relief before it likely runs out of power again soon. Using a multimeter or OB2 scanner to evaluate the battery’s condition can determine if it’s worth preserving or requires swapping out. Suitable replacement batteries for your specific BMW can be found on Amazon here by entering your vehicle details to filter for the right fit and choosing a highly-rated seller.

Robby Recommends:

Portable Car Battery Jump Starter Charger - NOCO Boost Plus GB40

At Home Battery Charger - YONHAN - Fully Automatic

Jumper Cables by Energizer for Car Battery - Heavy Duty

NOCO Boost Plus GB40 1000A UltraSafe Car Battery Jump Starter

YONHAN Battery Charger Fully-Automatic

Energizer Jumper Cables for Car Battery, Heavy Duty

If charging your 8 Series’s battery fails to solve ongoing issues like frequent draining and recharging even after installing a new battery, an underlying problem likely causes the excessive drain. Professional diagnostic services would then be needed to inspect and identify the root cause. You can also consult a mechanic online through us or obtain an instant quote from a mobile mechanic.

How to Identify and Fix Alternator Problems in a BMW 8 Series

Car wont start replace alternator needed

If you suspect the alternator is causing your car to have trouble starting, you can test it yourself. If you can temporarily get the auto running (you may need a jump start), and while the engine is running, disconnect the positive terminal of the battery. If the auto dies fairly quickly after that, it’s likely a bad alternator. Keep in mind though this test can be dangerous and damage delicate electronics in your motor, so it’s best to consult with an experienced mechanic in your town or online first since this test risks harming the delicate electronic gizmos in your BMW 8 Series.

If you figure out that the alternator is the problem, it’s a case of having it replaced. I recommend consulting an online or local mechanic as they will advise you on how difficult the repair is for your specific model, and you can work out if you want to try it yourself, or with the advice of an online mechanic

If you do want to try it yourself or take it to a local garage, you can often buy the replacement parts yourself cheaper than at the garage, but you need to know what to get for your model of BMW 8 Series. You find all the information you need about your specific vehicle by searching online for something like “lookup BMW VIN number“, which is a purchasable report, that will give the specs for your vehicle and which parts are compatible, and then you can go get the alternator parts you need. However, an easier option is, Amazon probably has the alternator you need online, at a cheaper price, and their site easily shows which ones will go in your specific car model. Check the Amazon alternator page here

How to Identify and Fix Starter Motor Problems in a BMW 8 Series

starter motor issues in a ford

If you think the starter motor might be causing your BMW 8 Series to not start up, pay attention for a clicking sound when you turn the ignition key. If heard, but the engine does not turn over, the starter motor likely requires replaced. You can take it to a local garage and have them repair it, or repair it yourself with the help and advice from an online mechanic guiding you. 

If you need it, one of the cheapest and easiest places to get a new starter motor, for your exact vehicle model is on the Amazon here.

How to Identify and Solve Fuel System Problems in a BMW 8 Series

clogged fuel filter car wont start

If you suspect a fuel system issue might be causing the no-start, tune your ears for the fuel pump hum when you turn the key to “on” before attempting to start the car. The pump should emit a faint humming for a few seconds. Should no such quiet hum be audible, the fuel pump could be faulty. Problematic starting, stalling, or poor throttle response may also result from a problematic or clogged fuel filter. Both pump and filter issues usually require a professional mechanic to diagnose and fix them properly, often involving fuel pressure testing and specialized diagnostic equipment. Later in this article, I detail the best ways to get help from a local BMW mechanic near you. 

How to Fix Electrical or Wiring Problems in a BMW 8 Series

fuses to check when car wont start

If you suspect it’s an electrical circuitry issue, first examine the fuses for the ignition system, and replace any that have blown. If your 8 Series starts after this, it was an effective, inexpensive fix! However, if it still won’t start, even sometimes, the ignition switch itself could be faulty. Dash lights on the dashboard could additionally mean a damaged sensor. These can be complex problems needing a qualified mechanic to identify and fix (see below advice on local mechanics).

How to Prevent Starting Issues in a BMW 8 Series

As dad would say: “An ounce of prevention is worth a pound of cure”. Here’s how to avoid future problems starting your 8 Series:

Routine Maintenance of Your BMW 8 Series

Regular maintenance on car to prevent starting issues

Regular maintenance is key to avoiding issues, including oil changes, battery checks, cleaning terminals, replacing the fuel filter as needed, and having a mechanic examine the car regularly. If unsure about maintenance for your model, consult a mechanic locally or online for clarification.

Drive Your 8 Series Frequently

drive regular to avoid car troubles

If your BMW 8 Series happens to sit motionless in the garage or front yard for too long without being driven, the battery can decrease as it is not being recharged by the engine running, through the alternator. Try your best to use your vehicle regularly to maintain a charged battery. If you remember you haven’t driven your car in a while, take it for a quick drive around town to ensure there is still a charge left.

Note: Letting the battery completely drain is also bad for its longevity, so try to avoid that.

Pay Attention to Warning Signs

Check Engine Control Light on a Vehicle Dashboard

If you notice any abnormal things like unusual noises, changes in driving and performance, or warning lights lit up on the dashboard, do not ignore them. These are often early signs of an issue that should be addressed ASAP before they escalate into larger problems later on. Consult with a mechanic locally or online about these problems and get advice on if they require attention.

When to Ask a BMW Mechanic Online

If you have limited time available, or despite putting in real effort on your own, you still can’t get your car to start, consider consulting a BMW mechanic online. It delivers quick professional advice from the comfort of your living room, and is far less expensive than a tow and diagnosis at the local garage.

Advantages of an Online BMW Mechanic

Happy mechanic repairing car looking at camera

By detailing what you’ve already tried and sharing specifics on the no-start issue, online mechanics can then offer a custom action plan to help get your car started again. With so many BMW mechanics available they can help fix nearly any problem, it doesn’t if matter it’s your 8 Series that’s having issues or a BMW 7 Series wont start, the online mechanics can help sort anything in no time. And with many household budgets tighter these days, an online mechanic provides instant affordable help when you need it most, 24/7.

You can describe the issues you’re having, ask BMW mechanics unlimited questions, and even upload photos and videos so you can demonstrate to the mechanic what you mean. You can chat with them via online chat or phone call, whichever you prefer. The BMW specialist will ID the issue, advise the top solution for your specific situation, and even walk you through basic maintenance step-by-step.

Whether you want an expert second opinion or are simply short on time, online repairs assistance is there when you need it. Give it a try to see firsthand how convenient fixing problems can be.

So feel free to try out our online BMW mechanic help service and see for yourself!

When and How to Get a Local BMW Mechanics Help

automobile mobile mechanic

When your BMW 8 Series won’t start, and you are unable to repair it yourself, thinking about how to get your vehicle to the garage can be a nightmare. There are options like roadside services, that come to you and can provide simple fixes to get your car moving enough again, so you can get it to a mechanic garage for proper repairs. You can also use a towing service, but these can be costly, easily into the hundreds of dollars. A much better option is the use of a mobile mechanic, who will come to you at your home, place of work, or by the roadside, and carry out repairs there and then for you, so you can get your 8 Series started again ASAP.

So if you think a mobile mechanic is the best solution for you, instead of searching on Google something like  “at home mechanics near me“, the best in the USA that also covers most towns is YourMechanicI have personally recommended them to countless people across the country and they always have a great experience.

Reasons I recommend them:

  • They use experienced ASE-certified mechanics
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If you would like to know more, the process to use them is this.

  1. Visit their official website here: YourMechanic
  2. Get an instant free quote for what you need
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Super easy, super reliable, super convenient, and highly recommended.

Conclusion

In short, when your BMW 8 Series won’t start, it can be a total bummer. However, grasping what might be causing the problems, being able to diagnose them, and knowing what steps are required in each case, and where to find help if necessary, will be a huge help. Keep in mind that routine care is vital to avoiding most car problems.

Frequently Asked Questions (FAQs) When a BMW 8 Series Won’t Start

BMW 8 Series won’t start but lights come on?

If your BMW 8 Series‘s lights turn on but it still won’t start, the issue may not be related to the battery. It’s highly possible there is a problem with the engine starter. Investigate if you hear any clicking sounds when trying to turn the key. If so, the starter motor is attempting to activate but failing. Get a mechanic check over the starter motor – it may need to be fixed or swapped out.

BMW 8 Series won’t start but has power?

When your BMW 8 Series has power (lights, radio etc work) but does not start up, there may be a fuel delivery problem. Issues like a faulty fuel pump relay could prevent fuel getting to the engine. Without enough fuel, combustion can’t happen and the engine won’t start. Listen near the back seat when turning the key – you should hear the fuel pump prime for a few seconds. If not, get a mechanic check the fuel system.

BMW 8 Series won’t start but battery is fine?

If your BMW 8 Series‘s battery checks out OK and is fully charged, but the car still refuses to start, the underlying cause is likely electrical. Possible issues include a bad ignition switch, broken sensor, or wiring problems. As electrical issues can be tricky, diagnosis by a professional mechanic is best. They can accurately identify the specific electrical fault and have it repaired.

BMW 8 Series won’t start just clicking?

When you turn the key and there’s only a clicking noise but the engine fails to turn over, the most common cause is a faulty starter motor. The click comes from the starter solenoid attempting to activate the starter motor, but the motor itself fails to crank the engine. As the starter motor needs mechanical repair or replacing, consult with a reliable mechanic to get your BMW 8 Series running again.

What if my BMW 8 Series won’t start up?

First things first, take a deep breath and don’t panic. Check for any odd noises, flashing lights, or changes in how it runs that could point to the issue. Most likely the culprit is one of the common problems we’ll talk about here. If you still can’t locate the exact issue, you’ll have to ask for help from a trusted BMW mechanic locally or online.

Determine if my BMW 8 Series won’t start because of the battery?

Clues that your BMW’s battery is the issue include, a slow cranking engine, dim front lights, and battery warning symbols lighting up on the dash. Also make sure the battery terminals are clean, corrosion-free, and tightly fastened. If your battery is exhausted it’s probably best to just replace it completely.

How to prevent my BMW 8 Series from failing to start in the future?

To prevent this nuisance from happening again, routine maintenance is essential. This includes oil changes, testing the battery and scrubbing its terminals, replacing the fuel filter when needed, and getting your BMW 8 Series inspected by a mechanic frequently. Also, remember to drive the car frequently so the battery stays charged.

Can I consult an online mechanic if my BMW 8 Series fails to start up?

Yes, you can. An online mechanic service like ours can offer immediate skilled BMW mechanic assistance and advice, without you having to leave your home. This is particularly helpful if your BMW 8 Series is unable to start and is stuck in the driveway,.

How can services like MechanicAnswer.com lend a hand if my BMW 8 Series isn’t starting?

We pair you with qualified BMW specialists who can offer suggestions particular to your unique predicament. You can brief them about your auto problems, ask as many questions as needed, upload images and videos so you can show in detail the issue. The specialist auto mechanic will be able to help, identify the fault, and recommend the ideal plan of action and talk you through it.

Interesting BMW 8 Series Facts

Did you know that the BMW 8 Series is equipped with a state-of-the-art gesture control system that allows you to adjust the volume, answer phone calls, and even change the temperature with just a wave of your hand? It’s like something straight out of a sci-fi movie! And get this – the 8 Series also features a carbon core construction, making it incredibly lightweight and agile for a car of its size. Plus, with a top speed of 155 mph and a 0-60 time of just 3.6 seconds, this beast of a machine is sure to get your adrenaline pumping. And if that’s not enough to impress you, the 8 Series also comes with a stunning crystal gear shifter and ambient lighting that can be customized to match your mood. It’s no wonder you’re itching to get behind the wheel of this beauty!

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Which Mechanic Suits You?

  1. Chat with an Online Mechanic to get instant, unlimited help and advice for 1 full week, for just £5.
  2. Get help from a Mobile Mechanic. We  recommend Fixter. They will come to you and fix your vehicle at a time that suits you. Instant free quote online below. We recommend the online mechanic first, as it’s cheaper for you, and you may not need an in-person mechanic.

Which Mechanic Suits You?

  1. Chat with an Online Mechanic to get instant, unlimited help and advice for 1 full week, for just $5.
  2. Get in-person help from a Mobile Mechanic. We recommend YourMechanic. They will come to you and fix your vehicle at a time that suits you. Instant free quote online below. We recommend the online mechanic first, as it’s cheaper, and you may not need an in-person mechanic.

Choose Your Mechanic

1. Chat with A.I. Mechanic (Robot Robby)
  • Free 7-day trial
  • A.I. Mechanic that is trained by our human mechanic writers. As helpful as a human mechanic for expert advice, troubleshooting, and repair guidance.
2. Chat with a Human Mechanic Online
  • Join for just $5, and $39/month. Cancel anytime
  • Real human ASE-certified mechanics available 24/7

Which Mechanic Suits You?

  1. Chat with an Online Mechanic to get instant, unlimited help and advice for 1 full week, for just $5.
  2. Get in-person help from a Mobile Mechanic Near You. They will come to you and fix your vehicle at a time that suits you. If there are none near you, you will be redirected to the online mechanic.

Which Mechanic Suits You?

  1. Chat with an Online Mechanic to get instant, unlimited help and advice for 1 full week, for just £5.
  2. Get help from a Mobile Mechanic. We  recommend Fixter. They will come to you and fix your vehicle at a time that suits you. Instant free quote online below. We recommend the online mechanic first, as it’s cheaper for you, and you may not need an in-person mechanic.

Which Mechanic Suits You?

  1. Chat with an Online Mechanic to get instant, unlimited help and advice for 1 full week, for just $5.
  2. Get in-person help from a Mobile Mechanic. We recommend YourMechanic. They will come to you and fix your vehicle at a time that suits you. Instant free quote online below. We recommend the online mechanic first, as it’s cheaper, and you may not need an in-person mechanic.

Where Can I Find My VIN?

Your vehicle’s unique Vehicle Identification Number (VIN) can be found on the title document, the vehicle registration, and the insurance policy. It is a series letters and numbers like this as example: WAUGC0896JA235262. The VIN can also be located on the following locations on the vehicle itself:

how to find VIN on vehicle