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 MANUALSBMW1987L7 (E23) L6-3430CC 3.4L SOHC (M30)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTECHNICAL SERVICE BULLETINSCUSTOMER INTERESTENGINE CONTROLS - INTERMITTENT NO START, NEW MAIN RELAY
1987 BMW L7 (E23) L6-3430cc 3.4L SOHC (M30)
Engine Controls - Intermittent No Start, New Main Relay
1987 BMW L7 (E23) L6-3430cc 3.4L SOHC (M30)SECTION Engine Controls - Intermittent No Start, New Main Relay
87BMW05
GROUP 13 Fuel System
Bulletin Number 13 11 86 (1191) Page 1 of 1
Montvale, NJ October 1987 Technical Dept.
This Service Information Bulletin supersedes S.I. 13 11 86 (1191) dated April 1986. It lists a revised Defect Code.
Please remove and discard S.I. 13 11 86 (1191) dated April 1986 from your S.I. binder.
SUBJECT: DME Main Relay
MODELS: E23, E28 and E30 (325 only)
Complaint: Occasionally engine will not start (starter engages but no fuel delivery).
Correction: Install new DME main relay P/N 12 63 1 708 646.
General
Information: Location of DME main relay is illustrated in the applicable Electrical Troubleshooting Manual under section "Component Locations".
Warranty
Information: Parts and labor reimbursable under the BMW Limited Warranty of 3 years/36,000 miles.
Defect code: 12 63 08 12 00
Labor operation: 61 31 521
Labor allowance: 1 FRU
GROUP 13 Fuel System
Bulletin Number 13 11 86 (1191) Page 1 of 1
Montvale, NJ October 1987 Technical Dept.
This Service Information Bulletin supersedes S.I. 13 11 86 (1191) dated April 1986. It lists a revised Defect Code.
Please remove and discard S.I. 13 11 86 (1191) dated April 1986 from your S.I. binder.
SUBJECT: DME Main Relay
MODELS: E23, E28 and E30 (325 only)
Complaint: Occasionally engine will not start (starter engages but no fuel delivery).
Correction: Install new DME main relay P/N 12 63 1 708 646.
General
Information: Location of DME main relay is illustrated in the applicable Electrical Troubleshooting Manual under section "Component Locations".
Warranty
Information: Parts and labor reimbursable under the BMW Limited Warranty of 3 years/36,000 miles.
Defect code: 12 63 08 12 00
Labor operation: 61 31 521
Labor allowance: 1 FRU
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.