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  #1  
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The Todal
 
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Default Engine Management System - 10-12-2008 , 07:51 AM






A 2005 Polo 1.4 with very low mileage, around 10,000 miles. After driving
down a motorway without any problem, on reaching the 30 mph area the car
starts to judder and reduce speed (but the engine doesn't actually cut out)
and the light goes on to warn of exhaust/engine management problem. The
light is blinking, but there is no other instruction message. Driver was
very worried, stopped the car, turned off engine, restarted after about 20
seconds, no further recurrence.

Is it sensible to take the car to a dealer immediately or is it likely that
they would be unable to find a problem and that this would be a waste of
money? I'm thinking let's wait till it happens again because maybe it's a
one off. Would the average exhaust centre be able to diagnose the problem,
if it was a lambda sensor or something connected to the exhaust system?

And is it unlikely that the driver (a family member, not me) would be left
stranded if this happened again and that the car would remain driveable?





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  #2  
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Chris Whelan
 
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Default Re: Engine Management System - 10-12-2008 , 07:58 AM






The Todal wrote:

Quote:
A 2005 Polo 1.4 with very low mileage, around 10,000 miles. After driving
down a motorway without any problem, on reaching the 30 mph area the car
starts to judder and reduce speed (but the engine doesn't actually cut
out) and the light goes on to warn of exhaust/engine management problem.
The
light is blinking, but there is no other instruction message. Driver was
very worried, stopped the car, turned off engine, restarted after about 20
seconds, no further recurrence.

Is it sensible to take the car to a dealer immediately or is it likely
that they would be unable to find a problem and that this would be a waste
of money? I'm thinking let's wait till it happens again because maybe it's
a
one off. Would the average exhaust centre be able to diagnose the
problem, if it was a lambda sensor or something connected to the exhaust
system?

And is it unlikely that the driver (a family member, not me) would be left
stranded if this happened again and that the car would remain driveable?
If it's still inside warranty, I would definitely get the fault logged with
a dealer.

Even if it's just outside the warranty period, as long as it has a service
history I would report it.

Chris

--
Remove prejudice to reply.


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  #3  
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Dave Baker
 
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Default Re: Engine Management System - 10-12-2008 , 08:19 AM




"The Todal" <deadmailbox (AT) beeb (DOT) net> wrote

Quote:
A 2005 Polo 1.4 with very low mileage, around 10,000 miles. After driving
down a motorway without any problem, on reaching the 30 mph area the car
starts to judder and reduce speed (but the engine doesn't actually cut out)
and the light goes on to warn of exhaust/engine management problem. The
light is blinking, but there is no other instruction message. Driver was
very worried, stopped the car, turned off engine, restarted after about 20
seconds, no further recurrence.

Is it sensible to take the car to a dealer immediately or is it likely
that they would be unable to find a problem and that this would be a waste
of money?
If the fault isn't currently manifesting it's vanishingly unlikely that a
dealer would be able to diagnose what it once had been.

I'm thinking let's wait till it happens again because maybe it's a
Quote:
one off. Would the average exhaust centre be able to diagnose the
problem, if it was a lambda sensor or something connected to the exhaust
system?
ROFL. The 'average' exhaust centre employees struggle to find the exhaust
system. Diagnosing engine faults is definitely not in their bailiwick.

Quote:
And is it unlikely that the driver (a family member, not me) would be left
stranded if this happened again and that the car would remain driveable?
Impossible to say. Most cars have a limp home mode for component faults but
if it's a bad wiring connection it could just lead to a complete breakdown.

I'd at least go round and check the basics. Water level, connections to
plugs and leads and any other wiring you can get to. It could be anything
though.
--
Dave Baker




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  #4  
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Adrian C
 
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Default Re: Engine Management System - 10-12-2008 , 08:45 AM



The Todal wrote:
Quote:
A 2005 Polo 1.4 with very low mileage, around 10,000 miles. After driving
down a motorway without any problem, on reaching the 30 mph area the car
starts to judder and reduce speed (but the engine doesn't actually cut out)
and the light goes on to warn of exhaust/engine management problem. The
light is blinking, but there is no other instruction message. Driver was
very worried, stopped the car, turned off engine, restarted after about 20
seconds, no further recurrence.

Is it sensible to take the car to a dealer immediately or is it likely that
they would be unable to find a problem and that this would be a waste of
money?
Try asking on a VW web forum. The depth of collected info on one of
these surpases usenet these days.

Some engine management systems log fault codes which can be read by the
dealer using diagnostic hardware. Given that more cars are incorporating
such hardware - service shops should be straight in with that kit,
especially since you are reporting dashboard lights indicating problems
with the EMS.

If interested and curious (like me), for VW engines a cable to connect a
laptop is not that expensive, and there is shareware/paid software that
can tell you what the problem is - but it's technical geeky stuff and
also the software has the ability to change things maybe you really
shouldn't. Alternativly there are many handheld gadgets that do the same
readout without the aid of a computer.

Have a look here.
http://www.vagproducts.co.uk/vagcom.html
http://www.ross-tech.com/vag-com/index.html

--
Adrian C


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  #5  
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Duncan Wood
 
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Default Re: Engine Management System - 10-12-2008 , 08:52 AM



On Sun, 12 Oct 2008 12:51:53 +0100, The Todal <deadmailbox (AT) beeb (DOT) net> wrote:

Quote:
A 2005 Polo 1.4 with very low mileage, around 10,000 miles. After
driving
down a motorway without any problem, on reaching the 30 mph area the car
starts to judder and reduce speed (but the engine doesn't actually cut
out)
and the light goes on to warn of exhaust/engine management problem. The
light is blinking, but there is no other instruction message. Driver was
very worried, stopped the car, turned off engine, restarted after about
20
seconds, no further recurrence.

Is it sensible to take the car to a dealer immediately or is it likely
that
they would be unable to find a problem and that this would be a waste of
money? I'm thinking let's wait till it happens again because maybe it's a
one off. Would the average exhaust centre be able to diagnose the
problem,
if it was a lambda sensor or something connected to the exhaust system?

And is it unlikely that the driver (a family member, not me) would be
left
stranded if this happened again and that the car would remain driveable?



If it's out of warranty any 1/2 way competent VW specialist can read the
fault codes which may give you a clue what happened. (Most of them will
just tell you that the engine cut out)


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  #6  
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Chris Bartram
 
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Default Re: Engine Management System - 10-12-2008 , 11:25 AM



The Todal wrote:
Quote:
A 2005 Polo 1.4 with very low mileage, around 10,000 miles. After driving
down a motorway without any problem, on reaching the 30 mph area the car
starts to judder and reduce speed (but the engine doesn't actually cut out)
and the light goes on to warn of exhaust/engine management problem. The
light is blinking, but there is no other instruction message. Driver was
very worried, stopped the car, turned off engine, restarted after about 20
seconds, no further recurrence.

Is it sensible to take the car to a dealer immediately or is it likely that
they would be unable to find a problem and that this would be a waste of
money? I'm thinking let's wait till it happens again because maybe it's a
one off. Would the average exhaust centre be able to diagnose the problem,
if it was a lambda sensor or something connected to the exhaust system?

And is it unlikely that the driver (a family member, not me) would be left
stranded if this happened again and that the car would remain driveable?


You should get the fault memory read, for a start. A dealer, an
independent VW specialist, or a nearby enthusiast can do this with
VAG-COM, and the latter can be found on VAG web forums and will
typically scan the car for the fair exchange of a few beers....


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