BMW 318is Ignition Coil Guide (1991-1999): Choosing Your Replacement
Solve misfires and rough running by picking the right ignition coil for your E30 or E36 318is.
- First, confirm your model year: 1991 uses a single coil, while 1992-1999 use a four-coil pack.
- Bosch is the original equipment brand and is the most recommended choice for reliability.
- For 1992-1999 models, always replace all four coils as a set to prevent future failures.
- Common symptoms include a flashing check engine light, rough idle, and hesitation during acceleration.
Is Your 318is a 1991 or a 1992-1999? This is Critical.
Before buying an ignition coil for your 318is, you must know which ignition system your car has. The model year range is misleading because it covers two different BMW chassis generations.
- 1991 BMW 318is (E30 Chassis): This model uses a single, canister-style ignition coil. This one coil provides spark for all four cylinders through traditional spark plug wires. If this single coil fails, your engine will not start or run. 🎬 Watch this guide on troubleshooting and replacing the E30 coil.
- 1992-1999 BMW 318is (E36 Chassis): These models, with either the M42 or M44 engine, use a block of four individual ignition coils. This is often called a coil pack. Each coil is responsible for one cylinder. Usually, only one coil fails at a time, causing a misfire in a specific cylinder.
Symptoms of a Failing Ignition Coil
A bad ignition coil will make itself known through poor engine performance. Here’s what to look for:
- Engine Misfires: The most common symptom. The car may jerk, sputter, or hesitate during acceleration.
- Rough Idle: Your car may vibrate or shake noticeably when stopped at a light.
- Check Engine Light: A failing coil will almost always trigger the check engine light. Common codes include P0300 (random misfire) and P0301, P0302, P0303, P0304 (misfire on a specific cylinder).
- Reduced Power: Your 318is will feel sluggish and slow to accelerate.
- Worse Fuel Economy: The engine wastes fuel when it can't burn it efficiently due to a weak spark. 🎬 See a visual breakdown of common bad ignition coil symptoms.
- Hard Starting or No Start: Especially for the 1991 model, a completely failed coil will prevent the car from starting.
Choosing the Right Aftermarket Ignition Coil: Brand Tiers
Not all aftermarket coils are created equal. For a BMW, sticking with proven brands is important for reliability. Bosch was the Original Equipment Manufacturer (OEM) for these vehicles.
| Tier | Brands | Assessment |
|---|---|---|
| OEM & Premium Aftermarket | Bosch, Delphi, NGK | Bosch is the original supplier, making it the safest choice for OEM performance and fit. Delphi and NGK are also top-tier manufacturers known for quality ignition components that meet or exceed original specifications. Choose these for the best reliability and longevity. |
| Quality Aftermarket | Standard Ignition (SMP), Walker Products | Standard Motor Products is a well-regarded aftermarket brand that has been around for a long time. They often provide a good balance of quality and price, making them a solid choice for a daily driver without the premium cost of an OEM part. |
| Budget-Friendly | URO Parts, DriveWire, Global Parts, Skyward | These brands offer the lowest price point. While tempting for a budget repair, their quality can be inconsistent. They may be a short-term solution, but failure rates can be higher than premium brands. URO Parts does offer a warranty, which provides some protection. Use with caution on a critical part like an ignition coil. |
Known Issues, Recalls, or TSBs
There are no active recalls or widely-known Technical Service Bulletins (TSBs) from BMW or the NHTSA for ignition coil failure on the 1991-1999 318is. Failures on these vehicles are typically due to age and heat cycles, which is normal for a part that is over 20 years old. While later BMW models had some coil-related service campaigns, they do not apply to the E30 and E36 318is.
Frequently Asked Questions (FAQ)
Can I replace just one ignition coil on my 1995 318is?
Yes, you can, and the car will run. However, it is not recommended. The coils have all endured the same conditions and mileage. Replacing only the one that failed often leads to another one failing soon after. Replacing all four at once is the best practice for reliability.
Is the ignition coil for a 1991 318is the same as a 1992?
No, they are completely different. The 1991 (E30) model uses a single, canister-style coil. The 1992 (E36) model uses a pack of four individual coils. You must order the correct part for your specific model year.
Is it difficult to replace the ignition coils myself?
No, this is a great DIY job for beginners. The coils are easily accessible on top of the engine. The job typically requires basic hand tools to remove a plastic cover and a few bolts, and can be completed in under an hour.
Are expensive ignition coils from brands like Bosch worth it?
For BMWs, yes. Bosch was the original manufacturer, so their parts guarantee a perfect fit and reliable performance. While budget brands are cheaper, they can have a shorter lifespan, leading to more repairs over time. Investing in a quality coil from a brand like Bosch or Delphi often saves money in the long run.
Helpful Videos
Technical Specifications
OEM Part Numbers: 12131727108 12131247281 12139066468 12131703359
Ignition System Type: 1991 (E30) uses a single remote coil with distributor wires. 1992-1999 (E36) uses a four-coil pack with individual coil wires (coil-near-plug).
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- BMW 318is: