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 MANAGEMENTIGNITION SYSTEMTESTING AND INSPECTIONOSCILLOSCOPE PATTERNS AND WAVEFORMSSPARK PLUG FAULTS
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)
Spark Plug Faults
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)SECTION Spark Plug Faults
Spark Plug Voltage Peak Evaluation
1 Normal ignition voltage peak. Spark plug is okay.
2 Low ignition voltage peak. Small electrode gap.
3 High ignition voltage peak. Large electrode gap.
Evaluation of Sparking Period at Idling Speed
Normal sparking period. Spark plug is okay.
Long sparking period.
Small Electrode gap.
Short sparking period.
Large electrode gap.
1 Normal ignition voltage peak. Spark plug is okay.
2 Low ignition voltage peak. Small electrode gap.
3 High ignition voltage peak. Large electrode gap.
Evaluation of Sparking Period at Idling Speed
Normal sparking period. Spark plug is okay.
Long sparking period.
Small Electrode gap.
Short sparking period.
Large electrode gap.
RENDER: 1.0x
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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.