TDC Sensor Replacement (with pictures!) - Page 16 - Renault Forums :: Independent Renault forum

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post #76 of 310 (permalink) Old 9th September 2007
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Hmm, food for thought, thanks for the advice, now you state this I just hope the problem remains solved for many months to come so that I do not become tempted to do it again.

As for removal, trust on this one, after I removed airbox and located TDC sensor there was no way I was going to get a spanner that I own in place to remove the sensor. So if the problem does come back then it will be to the garage for me.

At least I should be able to avoid any diagnostic charges and just state what I would like done.
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post #77 of 310 (permalink) Old 1st October 2007
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Quote:
Originally Posted by madnoel10 View Post
Hi Liz - the Top Dead Centre sensor and the crank sensor are the some thing - to be tedhnocally correct it should be referred to as the "crankshaft speed/position sensor". It may be worth giving it a clean and see if it helps - would be cheaper than paying for a diagnosis
Hi. Just reading through these problems and I have a Laguna II 1.9dci that occasionally does not start.. I think I will remove the camshaft position sensor and try and clean it to see what happens.

They have 2 sensors. 1 is for the crankshaft position ( TDC ) and the other is the camshaft position sensor on the top of the head and gets its signal from the camshaft....

They are 2 totally different sensors. If the engine looses its crankshaft signal ( TDC ) it will stall.... and will not start. The engine will not send any fuel. If the engine looses the camshaft sensor signal the engine will still run until you try to start it again... and usually when the engine is hot the camshaft sensor will usually work....The engine will still give fuel but needs both sensors to start the engine.

I think that is right. Maybe someone can clarify??

Thanks
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post #78 of 310 (permalink) Old 2nd October 2007
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Actually Merky,the sensor on the camshaft isn't the TDC sensor,it is the Camshaft Position Sensor!.It tells the ECU which cylinder is in the firing position,as if the engine is at TDC it doesn't guarantee that cylinder 1 is firing.

If the TDC /Crankshaft Position sensor is faulty it will cause starting problems and sometimes running problems.If the Camshaft Position Sensor is fautly the engine will still usually run,but like a bag of s##te!.

99% of the time the TDC sensor is at fault as small metal filings from the flywheel/clutch area stick to the magnetic pick up and block the signal,hence why cleaning it usually has a positive effect.The Camshaft Position Sensor is usually placed in an area where metal fragments are less of a problem......

I'd rather push my Alfa than drive a BMW....
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post #79 of 310 (permalink) Old 2nd October 2007
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Hi
My Laguna was cutting out and would not start so I changed the crankshaft sensor and all was ok..

Now occasionally the car takes a very long time to start. I've fitted glow plugs etc..

So I'm thinking maybe my camshaft sensor is at fault..

I've recently replaced my fuel tank, so I suspected something there but when the car starts it runs perfect.

Cheers
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post #80 of 310 (permalink) Old 4th October 2007
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This is an excellent post very helpful thankyou very much.

Wilky
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