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.
1986 Mercedes Benz 560SLFACTORY OEM SERVICE PROCEDURE
Engine Not Running
- Connect multimeter and Engine Tester (MCM-2110). Crank engine and check dwell angle. Nominal value should be 1-50% or 1-30° of dwell. If not okay, go to step 2). If okay, check ignition timing at cranking RPM. Timing should be about 1° BTDC. If not okay, go to step 4).
- With ignition on, test voltage between terminal No. 5 of diagnostic socket (coil terminal No. 15) and ground. Nominal value should be 12 volts. If okay, go to step 3). If not okay, test voltage supply from ignition switch. Test voltage difference between terminals No. 5 and 4 of diagnostic socket (coil terminals No. 1 and 15). Nominal value should zero volts. Go to step 3).
- Unplug ignition position indicator (Green wire) from ignition control module. Test resistance of sensor between connector terminals No. 7 and 31d with ohmmeter. Nominal value should be 730-910 ohms. If not okay, replace position indicator. If okay, go to step 4).
- Measure dwell angle. If no dwell angle is indicated, replace ignition contol module.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.