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 MANUALSBMW1993740IL (E32/2) V8-3982CC 4.0L DOHC (M60)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSYMPTOM RELATED DIAGNOSTIC PROCEDURESNO START TESTING
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)
No Start Testing
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)SECTION No Start Testing
TEST PROCEDURE
NOTE: Review "Checking the Basics".
Requirements:
- Starting system okay (battery charged, ignition switch and starter okay, etc.)
- Ground connections on battery, engine and body okay.
- Specified gasoline in tank.
- Engine in perfect operating condition (timing, compression, etc.)
a. Check power supply for Digital Motor Electronic (DME) control unit according to wiring diagrams.
b. Measure input signals.
- Speed signal from crankshaft sensor (inductive pulse sender) at starting speed.
- Air flow sensor signals.
c. Measure output signals.
- Activation of fuel pump relay according to wiring diagram.
- Ignition final stage.
- Fuel injectors.
d. Test fuel pressure.
- Refer to appropriate component tests.
NOTE: Review "Checking the Basics".
Requirements:
- Starting system okay (battery charged, ignition switch and starter okay, etc.)
- Ground connections on battery, engine and body okay.
- Specified gasoline in tank.
- Engine in perfect operating condition (timing, compression, etc.)
a. Check power supply for Digital Motor Electronic (DME) control unit according to wiring diagrams.
b. Measure input signals.
- Speed signal from crankshaft sensor (inductive pulse sender) at starting speed.
- Air flow sensor signals.
c. Measure output signals.
- Activation of fuel pump relay according to wiring diagram.
- Ignition final stage.
- Fuel injectors.
d. Test fuel pressure.
- Refer to appropriate component tests.
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.