Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBMW2006330CI COUPE (E46) L6-3.0L (M54)REPAIR AND DIAGNOSISTECHNICAL SERVICE BULLETINSCUSTOMER INTERESTENGINE CONTROLS - ENGINE POWER DROP AT 4,000 RPM
2006 BMW 330Ci Coupe (E46) L6-3.0L (M54)
Engine Controls - Engine Power Drop At 4,000 RPM
2006 BMW 330Ci Coupe (E46) L6-3.0L (M54)SECTION Engine Controls - Engine Power Drop At 4,000 RPM
August 2006
Technical Service
SI B 12 17 05
Engine Electrical Systems
This Service Information bulletin supersedes SI B12 17 05 dated September 2005.
[NEW] designates changes to this revision
SUBJECT
[NEW] M54B30 - Engine Power Drops at 4000 RPM
MODEL
[NEW] E46, E60, E85 with M54B30 engine (MS45.0 and MS45.1) and manual or SMG transmissions only
SITUATION
The customer may complain of an engine power drop at approximately 4000 RPM during aggressive acceleration.
CAUSE
Ignition timing retardation shift due to unfavorable knock adaptations in the 4000 5000 RPM range.
CORRECTION
On a customer complaint basis, perform the procedure described below.
PROCEDURE
1. Verify the complaint. This situation can vary from a slight surge to a noticeable drop in power during hard acceleration.
2. Do not replace any parts!
3. [NEW] Submit a PuMA case requesting authorization for DME shipment to the BMW Technical Services/Drivetrain Department for reprogramming using the PuMA case title: "MS45.1 DME KNOCK ADAPTATION RESET". Refer to SI B12 09 04 for DME shipping guidelines.
4. [NEW] This special DME programming can only be done in this manner.
5. [NEW] For the E60 only: The vehicle must also have a Vehicle data status of E060-05-09-530, or higher. If not, reprogram the remainder of the vehicle using the latest version of Progman.
WARRANTY
Covered under the terms of the BMW New Vehicle Limited Warranty.
For the appropriate labor operations please refer to the KSD system.
Disclaimer
Technical Service
SI B 12 17 05
Engine Electrical Systems
This Service Information bulletin supersedes SI B12 17 05 dated September 2005.
[NEW] designates changes to this revision
SUBJECT
[NEW] M54B30 - Engine Power Drops at 4000 RPM
MODEL
[NEW] E46, E60, E85 with M54B30 engine (MS45.0 and MS45.1) and manual or SMG transmissions only
SITUATION
The customer may complain of an engine power drop at approximately 4000 RPM during aggressive acceleration.
CAUSE
Ignition timing retardation shift due to unfavorable knock adaptations in the 4000 5000 RPM range.
CORRECTION
On a customer complaint basis, perform the procedure described below.
PROCEDURE
1. Verify the complaint. This situation can vary from a slight surge to a noticeable drop in power during hard acceleration.
2. Do not replace any parts!
3. [NEW] Submit a PuMA case requesting authorization for DME shipment to the BMW Technical Services/Drivetrain Department for reprogramming using the PuMA case title: "MS45.1 DME KNOCK ADAPTATION RESET". Refer to SI B12 09 04 for DME shipping guidelines.
4. [NEW] This special DME programming can only be done in this manner.
5. [NEW] For the E60 only: The vehicle must also have a Vehicle data status of E060-05-09-530, or higher. If not, reprogram the remainder of the vehicle using the latest version of Progman.
WARRANTY
Covered under the terms of the BMW New Vehicle Limited Warranty.
For the appropriate labor operations please refer to the KSD system.
Disclaimer
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.