Please describe the operating conditions in which your problems occur.

Does the stumble occur under cruise, acceleration or deceleration? Does it idle roughly?


I would imagine an anti-theft device wouldn't allow the car to start at all - not just "kill it" at the first turn.

Are you sure you have plenty of gas in the tank? Fuel senders do go bad.

When it dies, how does it die? Does it shudder? Is only the engine affected? Do you lose power to the pump when you turn (a simple magnetic 12V light on the trunk attached to the pump leads will tell you if you're losing voltage)?

Have you tried getting a few friends and bouncing one one side of the car or the other to see if it's simply an intermittant contact with the engine running?

Is there a check valve on the fuel return in the engine bay? I know there's one in the tank, which will kill an engine quick. A simple "blow" test on the return line from the engine should make you hear bubbles in the gas tank - if it puts up even a little resistance, it could be the culprit, but lateral movement shouldn't have an affect.

It would help to know what kind of tools you have to troubleshoot with.

Don't lose faith. Your problem is an interesting one, and I love interesting problems. I am, admittedly, not an MB-only tech, but when you get down to brass tacks, there's only 3 things you need for an engine to run. Air, fuel & ignition.

Does it matter how fast you take a corner? Have you tried turning at different speeds? 5mph, 10mph, 20mph, etc...

From what you describe, I'm kind of with the pawoSD - this sounds like a a contact made by inertial forces. It could just be 2 wires rubbing together. Regardless of make, I've come across tons of bad wiring that cause the strangest symptoms...

Does it happen when you turn in either direction? Are there wires anywhere near your engine mounts? Relays usually have make or break contacts which travel in one direction, so if it dies in both directions, that is indeed interesting.

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A.S.E Tech A1,A6,A7,A8 & MVAC 609 + EPA 608

Unless stated otherwise, any question I ask is about my greymarket 1985 380SEL.