TDC Sensor Replacement (with pictures!) - Page 34 - Renault Forums :: Independent Renault forum

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post #166 of 308 (permalink) Old 11th May 2009
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Hi all! Can anyone point me in the direction of a picture showing where the TDC sensor is on a 1.2 16v 2003 Clio? As usual the haynes manual is about as much use as hammering in a nail with a fish!

Thanks in advance!

Rik,
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post #167 of 308 (permalink) Old 20th May 2009
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why did you have to replace this what fault were you having
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post #168 of 308 (permalink) Old 4th June 2009
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Nothing Wrong With The Crank Position Sensor

Hi All,
Let me explain a bit about this problem. I work in the machine construction industry, where we fit proximity sensors to machines all the time, which is what the Crank Position Sensor is. The sensors have a very limited range of about 1.5mm. My brothers Clio Mk2 kept failing to start when it was warm and occasionally when cold. We fitted a new sensor which was fine for three months then the problem came back.
I took the sensor off and took it to work to test it. Attached it to an oscilloscope and all was fine, nothing wrong with it. Bearing in mind that knowing these sensors have a very limited range I decided to file out the mounting holes on the sensor bracket in an upward direction so I could position the sensor closer to the flywheel.
We rocked the car back and forth with it in first gear until the TDC mark on the flywheel was under the sensor.
I placed a 0.5mm feeler gauge between the sensor and the flywheel mark and tightened the bolts.
Since doing this to the old sensor we refitted it and the problem has never come back.
I am convinced that these sensors are mounted at their absolute maximum working distance from the flywheel. Once the engine warms up and expands by the tinyest amount, it moves the sensor to far away from the flywheel to sense it.
This also seemed to have cured the occasional cold starting problem he had aswell.
Darren.
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post #169 of 308 (permalink) Old 4th June 2009
 
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Originally Posted by 1938TubeStock View Post
Hi All,
Let me explain a bit about this problem. I work in the machine construction industry, where we fit proximity sensors to machines all the time, which is what the Crank Position Sensor is. The sensors have a very limited range of about 1.5mm. My brothers Clio Mk2 kept failing to start when it was warm and occasionally when cold. We fitted a new sensor which was fine for three months then the problem came back.
I took the sensor off and took it to work to test it. Attached it to an oscilloscope and all was fine, nothing wrong with it. Bearing in mind that knowing these sensors have a very limited range I decided to file out the mounting holes on the sensor bracket in an upward direction so I could position the sensor closer to the flywheel.
We rocked the car back and forth with it in first gear until the TDC mark on the flywheel was under the sensor.
I placed a 0.5mm feeler gauge between the sensor and the flywheel mark and tightened the bolts.
Since doing this to the old sensor we refitted it and the problem has never come back.
I am convinced that these sensors are mounted at their absolute maximum working distance from the flywheel. Once the engine warms up and expands by the tinyest amount, it moves the sensor to far away from the flywheel to sense it.
This also seemed to have cured the occasional cold starting problem he had aswell.
Darren.
hmm... Interesting. Good post, nice one.
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post #170 of 308 (permalink) Old 6th June 2009
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Smile Megane Scenic T reg 1.6 RT Alize tdc sensor

Hi folks, I'd just like to thank everyone who has contributed to this post and especially those with pictures as it's helped me loads.

I was having the well known issue of crappy idling, stalling at lights when in neutral and the worst of the bunch the issue of turning over but refusing to start, all of which were starting to become more frequent.

I've got a Megane Scenic T reg 1.6 RT Alize which has the K7M engine and I've just cleaned and replaced the TDC sensor after reading this thread and although it's too early to tell and could just be my imagination, I am sure that already I have noticed a marked improvement in how the engine is running and it seems to be firing up first try as it was when I bought it back in November. Time will tell but it's looking good so far.

One thing I am extremely happy about is that I was expecting it to be an awkward git to get to as so many seem to be but on the K7M engine there is quite literally nothing to move to get to it and access was a dream come true. In total it only took me 10 mins to find, clean and replace the sensor after giving it a squirt of good old WD40 which I'm guessing is as much for rust prevention as anything else. The sensor itself I'm guessing must have been replaced just before I bought the car as the tip is still shiny but there were some small metal filings on the end so I'm guessing that's really all it takes to throw it off.

Anyway, thanks again to all and happy motoring. :-D
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