Car shutting off on me - Mercedes-Benz Forum
 
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post #1 of 6 (permalink) Old 06-21-2019, 12:45 AM Thread Starter
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Car shutting off on me

So when I first start my car if stopped for a long enough period of time my car will shut off on me I can restart it and it’ll fire right up but my battery light comes on when it will randomly turn off. Anyone know what this might be? Thanks
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post #2 of 6 (permalink) Old 06-21-2019, 01:51 AM
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Vehicle: R129 500 SL 1991
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Suggest you fill out your public profile. What year, engine?

Possibly faulty ignition switch, alternator, low battery voltage, OVP or CKP sensor.
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post #3 of 6 (permalink) Old 06-21-2019, 01:53 AM Thread Starter
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It’s a 1991 M119 CIS V8
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post #4 of 6 (permalink) Old 06-21-2019, 02:03 AM
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Testing your charging system (alternator) and how healthy your battery is… that's where I would start.

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post #5 of 6 (permalink) Old 06-21-2019, 02:07 AM Thread Starter
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Had the battery and alternator charged it was fine
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post #6 of 6 (permalink) Old 06-21-2019, 07:31 PM
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How many miles? What is the rpm at idle, and also just before it shuts off?

Battery light will automatically come on if revs drop too low to the point where the engine is about to stall, or when engine has stalled but ignition is still on.

If your OVP is more than 5 years old I would replace it anyway.

You can check the ignition switch by measuring voltage across the fuse box terminals (in the engine compartment) and earth with a multimeter. If one or more are showing lower voltage compared to others, itís usually a sign that there is a problem with the ignition switch, which incidentally is relatively common to early CIS-e V8s.

Although sometimes a faulty ignition switch causes a drop in amperage, not voltage, which is harder to measure.

A faulty ignition switch usually starts out intermittently with either one or a combination of the following symptoms - engine randomly cuts out, random non start, flashing instrument cluster lights, random cluster light outage.
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