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Dear Cap'tan Pete,
Good a.m. and may this find you well. I beg leave to point out that the device I described is not a speed limiter.
Rather, it is a device - present on gasoline-fired cars (possibly not on diesel cars) - that prevents fuel being sent to the engine, if the engine is not turning. It reads the rotation of the fly-wheel or flex-plate and signals the engine computer to order the fuel pump to send fuel to the engine.
If an accident damages and so stops the engine, this device will cut power to the fuel pump. That prevents fuel from being moved towards an engine, which may be on fire.
If this device - a crank or RPM sensor (Volvo Part No. 3547847-8) NOT a speed limiter - fails, the engine dies. If the wires to this sensor deteriorate with time, it will work intermittently, until it stops working entirely. A failing crank sensor definitely could work when cold, but not work when hot.
Ask your Volvo dealer if your car has this device. It is located on top of the transmission bell housing, just to the passenger side of the center line. It is visible from the passenger-side, rear corner of the engine. It is held on by a single 10mm bolt.
I'd be surprised if there isn't one.
Am I right to think that coolant or air temp sensors proved not be present?
Keep digging: you'll find the cause.
Yours faithfully,
spook
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