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Myvw polo keeps cutting out lots of fibres coming out off rear pipe

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The fibers you describe is most probably the glass fiber insulation falling apart inside your car's silencer (muffler). Since your car is switches off, it can be equated to a potato that is pushed into the exhaust pipe which will block to exhaust fumes from escaping. In theory this is probably what the glass fibers is currently doing.

Because of this, the Lambda Oxygen sensor upstream of your catalytic converter is sensing this congestion of fumes and sending pulses to the ECU (engine control unit) which kills power to the engine. The fault isn't a mechanical or electronic by rather a maintenance issue. Have your silencer (muffler) replaced and your problem will miraculously disappear.

Posted on Feb 09, 2013

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The fibres coming out of the tail pipe would be the glass wool coming out of a muffler which is breaking apart internally. Whether this is the reason for the engine cutting out is difficult to say. It is possible that the glass wool is restricting the exhaust to the extent that you are not getting sufficient evacuation of your burnt gasses or it is upsetting some of the sensors. Have the muffler problem attended to and see if that makes a difference to the engine operation, and then take it from there. If you find this helpful, please rate the solution.

Posted on May 21, 2011


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