Thank you for the tip. Is there any way to test the crankshaft speed position sensor with multimeter? Renault quoted around £50 for the part and it will be good to know, if possible, if the sensor is faulty before going for a new one.
Is it possible that bad earth can cause similar problems?
Bad earth points seem to be quite common issue with these cars (three days ago I had to fix bad earth of the rear light panel in my car which is the same model and age; see also car-by-car breakdown on this site). I recall the garage mentioning that at some point during a "cough" even the plugged in test unit lost power. I assume one possible explanation for such "blackout" could be an unreliable earth point of the ECU.
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Clicking sounds from fuel pump relay and injectors could indicate a poor earth connection for the fuel injection control unit.The ground earth points are usually on the front of the engine block or at the rear of the engine below inlet manifold.Another possibility is poor connections to the efi control unit multiplug , situated behind o/s headlight by inner wing area.
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nin
The crank sensor should show a resistance of around 200 ohms across it's two [disconnected] terminals. An oscilloscope is the preferred method of testing; but they're not widely available. If you can test it when it's not starting; then resistance may well be good enough.
Bad earths/bad wires/bad connexions are very possible; but it's the temperature component of the symptoms that suggests something that gets hot is at the root of the problem. This is a very common fault on all Renaults.
Some Renault engines break their engine management earth wires where they connect onto a bolted terminal at either the inlet manifold area or near the alternator. Given the scanner incident; worth a check. If not; maybe a secondhand crank sensor from a breakers for a quick test?
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elekie&a/c doctor , Screwloose
Thank you for the advice and detailed descriptions.
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We called local mobile electrician/mechanic who quickly found the offender. As elekie&a/c doctor suggested it was bad ECU connection: good cleaning of both the plug and the socket had fixed it.
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