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.

1990 Mercedes Benz 560SECFACTORY OEM SERVICE PROCEDURE

EZL Electronic Ignition: Spark

Using high output spark tester, look for spark at coil wire and each spark plug wire. Verify correct spark plug wire resistance on suspect wires. See HIGH TENSION WIRE RESISTANCE table.

HIGH TENSION WIRE RESISTANCE

Application	Ohms
All Wires	25,000-30,000

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Factory Service Tools

Use the Manual With the Right Hardware

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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.