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 SYSTEMSTESTING AND INSPECTIONSYMPTOM RELATED DIAGNOSTIC PROCEDURESON BOARD DIAGNOSTICS
1987 BMW L7 (E23) L6-3430cc 3.4L SOHC (M30)
On Board Diagnostics
1987 BMW L7 (E23) L6-3430cc 3.4L SOHC (M30)SECTION On Board Diagnostics
The Motronic Control Unit used in the Powertrain System does NOT have On-Board Diagnostic capabilities and, consequently, does NOT store diagnostic trouble codes (DTC's).
Troubleshooting should be conducted using the Symptom Troubleshooting charts and Test Position flow charts under "Symptom Related Troubleshooting". Symptom Related Diagnostic Procedures
RENDER: 1.0x
NO RELATED
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Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.