Renault Clio 2 - Loose Wiring Loom Cover Cutting Into ECU Loom*FIXED* - Page 11 - Renault Forums :: Independent Renault forum

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post #51 of 80 (permalink) Old 22nd February 2010
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Smile Re: Renault Clio 2 - Loose Wiring Loom Cover Cutting Into ECU Loom*FIXED*

Hi i have just joined this forum.
I would like to share with you how I solved the problem with the engine management light coming on my daughters Clio 2002.
Symptoms: Oil in air box, management light coming on after de-acceleration and small amount of white emulsified oil inside oil filler cap.
I took the car to an auto electrician and the fault code pointed to the map sensor. This was replaced free of charge as they broke it taking the old one off! This did not cure the problem.
I decided to strip the top half of engine to inspect.
I took the air box/inlet manifold off, and also the rocker cover.
Inside there are 2 adjoined breather tubes from the crankcase these were both blocked. The smaller outlet runs directly to the inlet manifold chamber where the map sensor is located.
So the map sensor was working fine; it was the increased pressure in the inlet manifold triggering the sensor due to the blocked crankcase breather.
I cleaned all components, and used a small drill bit to remove small carbon deposits inside the smaller breather tube.
Also discovered where the oil was coming from. There are 4 or five rocker cover bolts that are inside the main rocker seal or wet joints. These needed to be resealed with silicon joint sealer.
Everything was put back together using new gaskets and seals. Added product called Kalimex K-Seal to the water, which is an engine block and gasket sealer. Flushed the engine using an oil flush product, then replaced oil and filter.
The car is now cured and my daughter is happy.
Having read all previous posts I have found this very useful. The engine wiring loom seems to be the 1st culprit for diagnoses when the engine management light comes on, but this is not always the case.
Lirk
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post #52 of 80 (permalink) Old 24th February 2010
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Exclamation Re: Renault Clio 2 - Loose Wiring Loom Cover Cutting Into ECU Loom*FIXED*

hi there,
cant believe how common this problem is!
Ive just had the same issue with the wires being slightly cut.
Got that tested and sorted out (100) and the car still plays up.
The light comes on (as shown in the pic) and it wont idle properly eventually cutting out. This happens mostly when the engine is warm, eg when sitting at junctions/in traffic/or when stopping for petrol etc.

Took it back to the garage who then told me it was the mapping sensor which is currently on order. They fitted a sensor from their megane courtesy car, however the same is still happening!!!!

Any ideas on what this could be? Its driving me crazy, and i dont want too keep spending money trying to fix it!
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post #53 of 80 (permalink) Old 25th February 2010
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Re: Renault Clio 2 - Loose Wiring Loom Cover Cutting Into ECU Loom*FIXED*

Quote:
Originally Posted by beddin90 View Post
hi there,
cant believe how common this problem is!
Ive just had the same issue with the wires being slightly cut.
Got that tested and sorted out (100) and the car still plays up.
The light comes on (as shown in the pic) and it wont idle properly eventually cutting out. This happens mostly when the engine is warm, eg when sitting at junctions/in traffic/or when stopping for petrol etc.

Took it back to the garage who then told me it was the mapping sensor which is currently on order. They fitted a sensor from their megane courtesy car, however the same is still happening!!!!

Any ideas on what this could be? Its driving me crazy, and i dont want too keep spending money trying to fix it!
Ref 23rd Feb 2010

Hi Beddin90
If your map sensor is showing a fault and the wiring looks OK its best strip down inlet manifold and check breather pipes for blockages. (See my previous post)
If these breathers are blocked this will increase the vacuum within the inlet manifold especially so on de-acceleration, this in turn will trigger the sensor causing the management light to come on. You may find as you accelerate the light will go off. This is because more air is drawn through the throttle body and allowing the sensor to come back into range.

Possible causes of blocked pipes as follows;
Emulsified oil- water in oil usually head gasket
Carbon build up or lack of oil/filter maintenance.
Hope this helps
Kevin (LIRK)
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post #54 of 80 (permalink) Old 26th February 2010
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Re: Renault Clio 2 - Loose Wiring Loom Cover Cutting Into ECU Loom*FIXED*

hi lirk, before doing all this did you or anyone here clicking noises coming from back of dash
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post #55 of 80 (permalink) Old 26th February 2010
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Re: Renault Clio 2 - Loose Wiring Loom Cover Cutting Into ECU Loom*FIXED*

Quote:
Originally Posted by bushas View Post
hi lirk, before doing all this did you or anyone here clicking noises coming from back of dash
No.
If you have any unusual noises you will have to be more specific. ie when the car is moving. When the ignition is switsced on, or related to engine speed ect ect.
Lirk
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clio , cover , cutting , ecu , loom , loomfixed , loose , renault , wiring

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