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Clio 1.2 16v - toxic warning & non-starter!

tlracer

New Member
I'd appreciate any advice on a problem that has me stumped!

Car is a 51-plate 1.2 16v Clio (D4F engine).

On Saturday afternoon the toxic fume warning light came on. After about a minute's slow driving it went out again and stayed out, after which the car was fine, with no apparent issues.

On Monday morning it wouldn't start - engines turns over strongly but doesn't fire. The toxic fume light comes on and stays on, but no other warning lights.

4 years ago the car had the common 'toxic fume/electrical fault' lights on due to oil build-up in the air intake system, so in case this had happened again this was stripped and all cleaned. Still wouldn't start and the toxic fume light is still permanently on.

It has fresh fuel in the tank and there is fuel pressure. There was apparently no spark, so the coil/leads were changed for new assembly. There is still no spark with the new leads.

My OBD reader shows no error codes.

Any thoughts on what else I could try? I'm starting to think it could be the ECU that's failed as I can't fathom anything else that would give rise to a lack of spark and the single warning light, which otherwise don't seem connected.
 
Check the wiring loom above the ECU, back of engine. The 1.2 16V as a daft anti-tamper cover the plug's, that works loose, and cut the wire's. Give that a look first. Also check the TDC sensor above the gearbox. this may only need a clean, this tells the ecu when to fire.
 
Hi Peter - anti-tamper box all okay (top section removed a few years ago and the lower part packed-out to prevent movement/chafing on the wires).

I've checked the TDC sensor - it was a little dirty but otherwise appeared visually ok. Haven't checked the resistance - any idea what it should be?

UPDATE: Looked up the resistance of the TDC sensor (200-270 ohm), so once it stopped raining I took mine off again and checked...about 1M ohm, so a new one is on order!
 
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