TDC Sensor Replacement (with pictures!) - Page 20 - Renault Forums :: Independent Renault forum

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post #96 of 308 (permalink) Old 3rd December 2007
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It's not unusual to see a light coat of rust on the flywheel - much beeter than a coat of oil which would be a sign of a leak. Excessive rust could be the result of the engine bay being power washed or steam cleaned sometime in its life.
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post #97 of 308 (permalink) Old 3rd December 2007
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Things that helped me with my Scenic

Quote:
Originally Posted by smiggles View Post
I've just performed this little stunt on a W plate 1.6L 16V Scenic Alize and it was nowhere as easy as you would think...

The sensor (made by renault) has two quite deep captive nuts fastened to the front plate that will only fit into the rear of the mounting points on my vehicle (not the front) as shown in your pictures. This means that width of the sensor now causes serious clearance issues and it took me 20 minutes to get the old one out and nearly an hour and a half to get the replacement in.

Because you have to come at it from the back getting the sensor back in requires you to work blind in a space not quite big enought to tilt the sensor to its correct orientation without serious risk of damaging the wiring connector (I seriously recommend you don't try to fit it with the wires pre-connected).

The whole process is seriously hampered by the placement of the main wiring loom only centimeters above where the sensor should go (as in your pictures). This loom is unmoveable and caused me some serious grief- as it seems to be deliberately designed to hurt anybody attempting the process via some quite sharp dodgy moldings on its underside directly above where the senor fits.

All in all a pain. I'm not a mechanic, but i am reasonably competent at this sort of stuff - and I wouldn't attempt it again on this particular type of car - my poor twisted fingers will happily pay for someone else to do it next time.

This car has only got 33k on it and this is the second replacement that its had.

A poor product badly designed.

I had the same problems as smiggles. It was a very frustrating job - I just finished it - took me several hours to remove and reinsert the sensor.
I unscrewed three bolts that held the main wiring loom - this allowed me to lift it a few millimeters. Along with some WD40 on loom's bottom eased the release of the TDC sensor.
Since the room for play is very little the position of the sensor when being removed and reinserted is very important. For me - it was with the the washers side up - that is when removing it I tried to lift the sensor and rotate it counter-clockwise so that the magnet that was facing the flying wheel was now facing the battery side - and then slide it away from me to the firewall side. Same route for reinserting it.
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Last edited by raananh; 3rd December 2007 at 03:07 PM. Reason: clarification
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post #98 of 308 (permalink) Old 4th December 2007
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The cleaning works - it's dirty not faulty

Quote:
Originally Posted by madnoel10 View Post
It's not unusual to see a light coat of rust on the flywheel - much beeter than a coat of oil which would be a sign of a leak. Excessive rust could be the result of the engine bay being power washed or steam cleaned sometime in its life.
Thanks that was assuring. I'd never wash my engine before but when it rains it pours over here...

Had the Ignition coil problem before but solved it by just wrapping the affected area with cheap insulaton tape..seems to be work just fine...the tiny hole on the plastic spark plug connector was caused by a water droplet pulling the spark from the end of connector and grounds on the water droplet and the spark punched thru the thin wall of the plastic connector which was the cause of spark leakage which cause severe misfirings and severe loss of power..

TDC sensor and ignition coil - the common inherent probs of all Renault heh,..

The lack of sealing rubber o-ring on the connectors (there are notches for the o ring) enables moisture going into the spark plug chambers/tubes.

The TDC sensor issue was the cause of 2nd gear jerking at low RPM range also which later will lead to more serious prob - hard to start...the jerking's just a minor symptom before it then renders your car lifeless - engine can't be started.

3 days now - it's all fine now by just cleaning the sensor..I doubt the sensor spoilts easily, sooner or later even you'd changed the sensor, it will return to haunt you.
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post #99 of 308 (permalink) Old 8th December 2007
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A couple of weeks ago my baby managed to remove the code and the central locking did not work or immobiliser, my car wouldnt start either ( renault megane scenic S-Reg ).

A fella came down and poked a button on the dashboard and put the code in then the car started.

Everything was fine for about 2 weeks and i went to restart the car today after driving it around for most of the morning, Came out of the house to start it the central locking worked and everything appeared fine,

but the car would not start and there is no spark coming from the spark plugs, i have changed the spark plugs and there is still no spark from the plugs at all.

Could anyone give me advice of what this problem is and how to resolve it ???

thanks
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post #100 of 308 (permalink) Old 8th December 2007
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hi

i have just taken out the tdc sensor and cleaned it with a wire brush, wd40 and a cloth and put it back on but still i cant get the scenic started

any ideas???
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