Ignition Coil Guide for the 1993-2001 BMW 740iL (E38)
Fix your rough idle and misfires by choosing the right ignition coil for your E38 V8 engine.
- Bosch is the original equipment brand and the most recommended choice for this vehicle.
- Before replacing coils, you MUST check for and fix oil leaks from the valve cover gaskets, as this is a primary cause of coil failure.
- The 1993-95 (M60) and 1996-01 (M62) models use different coils; verify your engine type before ordering.
- Replacing all eight coils at once is highly recommended for long-term reliability.
Is Your 740iL Running Rough?
A failing ignition coil is a very common issue on the E38 740iL that can cause poor engine performance. The signs are usually easy to spot. If your car hesitates when you accelerate, vibrates at stoplights, or the Check Engine Light is on, a bad coil is a likely culprit. These parts sit on top of a hot engine and fail from heat and vibration over time.
Check for Oil Leaks First!
Before you buy new coils, you must check for oil in the spark plug wells. Leaking valve cover gaskets are the number one killer of ignition coils on the M60 and M62 V8 engines. If you pull a coil out and see oil on it or in the tube, you must replace the valve cover gaskets. If you don't, the oil will quickly ruin your new ignition coils.
Choosing the Right Aftermarket Ignition Coil
With many brands available, picking the right one can be confusing. For a critical part like an ignition coil, quality matters. Here’s a breakdown of the brands to help you decide.
Tier 1: OEM & OE-Equivalent Brands
These brands are either the original factory supplier or have a reputation for equivalent quality. They are the most recommended choice for reliability.
- Bosch: Bosch was the Original Equipment Manufacturer (OEM) for the 1993-2001 740iL. Choosing a Bosch aftermarket coil is the safest bet for factory performance and fit without the high dealership price.
- Delphi: Delphi is another major OEM supplier for BMW and is known for high-quality electronic parts. While some owners of newer BMWs prefer Delphi, Bosch is the original part for the E38. Delphi remains an excellent, reliable alternative.
- NGK: Famous for spark plugs, NGK also produces high-quality ignition components and is a trusted name in the industry.
Tier 2: Reputable Aftermarket Brands
These brands are well-known in the aftermarket and can offer good value, though they may not have the same OEM pedigree.
- Standard Motor Products (SMP): A long-standing brand that generally offers decent quality parts. However, quality can sometimes be inconsistent, so it's a step below the OEM-tier brands.
- Hitachi: A major Japanese OE supplier known for excellent electronics. While not original to BMW, their quality is generally respected.
Tier 3: Value Brands
This category includes brands like URO Parts, DriveWire, Holstein, and others. While the low price is tempting, the quality and longevity can be a gamble for sensitive electronic parts. Some forum users report early failures with budget coils. For a part that can leave you stranded, it is often worth spending more for a Tier 1 or Tier 2 brand.
Common Ordering Mistake: M60 vs. M62 Engines
The 1993-2001 740iL used two different V8 engines, and they use different ignition coils. Make sure you order the correct part for your vehicle.
- 1993-1995 740iL (M60 engine): Uses an earlier style "pencil" coil.
- 1996-2001 740iL (M62 engine): Uses a later style coil with an integrated rubber boot.
Always verify the part fitment for your specific model year before purchasing.
Cost of Replacing Ignition Coils
| Item | Estimated Cost (for one coil) |
|---|---|
| New OEM (from dealer) | $120 - $180 |
| New Aftermarket (Tier 1) | $50 - $90 |
| New Aftermarket (Value) | $28 - $50 |
| Shop Labor | $75 - $150 |
Note: It is highly recommended to replace all eight coils at once.
Frequently Asked Questions
Should I replace all 8 ignition coils at the same time?
Yes, this is highly recommended. All the coils on your engine have been exposed to the same heat and wear. If one has failed, others are likely to fail soon. Replacing them all at once saves you from repeated repairs and ensures smooth engine performance.
How do I know which coil is bad?
The easiest way is to use an OBD-II scanner to read the trouble codes. A code like 'P0305' indicates a misfire in cylinder 5. To confirm, you can swap the coil from cylinder 5 with a coil from another cylinder (like cylinder 1). Clear the codes and drive the car. If the code changes to 'P0301', you have confirmed the coil is the problem. If the code remains 'P0305', the issue may be the spark plug or fuel injector.
Is this a difficult job to do myself?
No, this is one of the easiest DIY jobs on a 740iL. The coils are located right on top of the engine under plastic covers. The job requires only basic tools like a 10mm socket and can be done in less than an hour, even for a beginner.
Do I need to use dielectric grease?
Yes, it's a good practice. Applying a small amount of dielectric grease to the inside of the new coil's boot helps seal out moisture and makes it easier to remove the coil in the future.
Were there any recalls for the ignition coils on the 1993-2001 740iL?
No, searches of the National Highway Traffic Safety Administration (NHTSA) database did not show any ignition coil-specific recalls for the 1993-2001 BMW 740iL.
Technical Specifications
OEM Part Numbers: 12139066468 12131703359 12131748394 12131748018
System: Coil-on-Plug, Quantity: 8 required for V8 engine
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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 740iL:
- 🛍️ Shop This Part
- Is Your 740iL Running Rough?
- Check for Oil Leaks First!
- Choosing the Right Aftermarket Ignition Coil
- Tier 1: OEM & OE-Equivalent Brands
- Tier 2: Reputable Aftermarket Brands
- Tier 3: Value Brands
- Common Ordering Mistake: M60 vs. M62 Engines
- Cost of Replacing Ignition Coils
- Frequently Asked Questions
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