Audi A6 Avant 2.5TDI - Poor Warm Starting

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Tue 15 Mar 2011 21:04
Audi A6 Avant 2.5TDI - Poor Warm Starting - Petestan

Hi bought a 2002 A6 Avant 2.5TDI. Runs really well, starts from cold fine but is very difficult to start when warm specially when say the car has been run then left for an hour or so. Bought the diagnostic software and lead but no fault codes are listed.

Has anyone had the same experience or could advise on what the problem could be?

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Wed 16 Mar 2011 20:55
Audi A6 Avant 2.5TDI - Poor Warm Starting - Avant

Moved to Technical.

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Thu 17 Mar 2011 12:58
Audi A6 Avant 2.5TDI - Poor Warm Starting - injection doc

it really needs the fuel pressure readings taken whilst cranking. Its possible its a crank sensor, as this often doesnt flag as a fault as the ECU doesnt know its turning over if it doesntr get a signal. Sometimes if they are continually cranked for a long duration 15-20 sec it may flag a crank sensor fault ! Not good for the starter.

If you can access the crank sensor when hot, remove and try freezing with pipe freeze and refit and if it starts you know its the sensor, unless you have a scope ?

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Mon 26 Sep 2011 21:54
Audi A6 Avant 2.5TDI - Poor Warm Starting - StewartG

I have the same fault on the same car and was wondering if the fault was now fixed ans what cured it?

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Mon 26 Sep 2011 21:55
Audi A6 Avant 2.5TDI - Poor Warm Starting - StewartG

I have the same fault on the same car and was wondering if the fault was now fixed ans what cured it?

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