Cars got a cold

[Sxfash]

When you turn the engine off about 2seconds later the car coughs like a thud only just started doing it yesterday anyone know what this could be thanks ash

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[@Lee]

year? Engine code?

[LGM]

Have you changed/replaced anything over the last week?

[devonutopia]

EGR unit not closing the anti shudder valve?

 

Are you saying this is 2 seconds once the engine has fully stopped turning?

[giandougl]

In the old days that was called pre-ignition where carbon remained hot and ignited what petrol vapour was left in combustion chamber.

Is your Fabia VRS petrol or diesel?

[Sxfash]

[q uote name=devonutopia" post="3738032" timestamp="1397597333]EGR unit not closing the anti shudder valve?

Are you saying this is 2 seconds once the engine has fully stopped turning?

Ye bang on pal

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[Sxfash]

Diesel

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[danny6189]

I would say the egr anti-shudder valve aswell

[Sxfash]

Is that the thing on right hand side of engine

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[devonutopia]

Its the thing with a flying saucer on top at the back left of the engine.  The black boost pipe comes up to it from the front offside corner of the front bumper, and does a right turn in to the EGR.  However, if the engine has turned off for 2 seconds, i.e is "dead" I don't see how the EGR can be to blame.  In theory it has done its job of shutting the car down, and I cannot think where there could be a pressure to release somewhere after everything has shut down?

[Sxfash]

Just tried it now it's as the engine is shutting down

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[devonutopia]

Does it sound more like it's stalling when shutting down, than actually cleanly turning off?   If so, then that is EGR I think.  I'd be tempted to unbolt it and see how cacky it is inside.  Car high miles?

[Sxfash]

Be 150.000 tomorrow an already cleaned it 10000 miles back but got someone to turn it me of while I was under bonnet an it from the air filter lad who had it before me stuck a silly cone filter on

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[Steve Neate]

Are there any codes on the ecu?

 

The ASV in an eye watering £300+.

 

SN

Edited 16 April, 2014 by Steve Neate

[fletch101]

Hard npicew to explain. But when I have cold air feed off of mine (to make it louder)

When I turn engine off it makes a wind down noice then a "KUDUNK " noice.

it mayne just your turbo spooling down ?

[Sxfash]

He exactly same pal just wondered why it's only just started making it

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[Guest BigJase88]

Just tried it now it's as the engine is shutting down

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If its the egr / anti-shudder (faulty) it wont 'cough' on shut down every time. All depends what position the engine is on shutdown. Sometimes it will shut off cleanly, other times it will shudder.

Good time to ditch the egr / ccv.

[06vrsandy]

If its BLT engine (2006/55+) its electronic antishudder valve and you can check its operating by removing the corner pipe at back left of engine before egr, get someone turn key back and forth from position II (without starting engine) and you should see it open and close.

 

My BLT also makes a noise about 2 seconds after engine has fully stopped, a sort of quite quiet hollow deep inhilation, like the release of a vacuum, rather than detonation or run-on. My anti shudder valve is working fine by the looks of things and still makes this noise.  I initially wondered if its the opening of the anti shudder valve releasing a vacuum after the engine has ceased that causes it.

 

If its any help I suspect my EGR is thoroughly gakked up judging by the gak caked on onto the ASV flap.

Edited 16 April, 2014 by 06vrsandy

[Sxfash]

Okay thanks for advice

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[devonutopia]

The kudunk might just be the engine shaking on the lower dogbone mount as it shuts down.