Skoda Octavia problem starting when warm

An 04 plate diesel ought to be fully obd compliant,and as it's really a VW I'd say diagnostics should be good.
Maybe your guy isn't up to date with his scan tools,replacing parts to "see" if they fix it are hit or miss at best.
You need the vehicle for work so take it to the dealer,pay for the hours rate diagnostic,and get a full print out of everything,then if you want to go back to your guy armed with this information.

Here is another suggested solution from Skoda forum on same fault,




Briskodian


Group:FREEDOM
Posts:2317
Joined:16-May 04
Car:Octavia TDi 110


Posted 13 September 2009 - 07:40

It's a well known problem. The solution is to replace the battery. What confuses most owners is that the battery tests 'OK' when you go to get it tested. The is because they don't test the CCA.

In the car manual it states 'Batteries, which are more than 5 years old, must be replaced'. This is for average use. If you do a lot of stop/start jouneys you will need to do it sooner.

Below is my post from a previous thread...

This is a known problem with these cars.

When cold, the ECU instructs the injection pump to supply fuel immediately - regardless of engine rpm.

When warm, the ECU instructs the injection pump to supply fuel immediately only when the engine is cranked at 260rpm (or greater).

As the starter motor loses efficiency and/or the battery starts to degrade, it takes longer to start the car. My understanding is that it takes 1 second longer for every 2 rpm under 260. At 30 seconds the pump always receives the instruction to inject regardless of engine rpm.

A good number of people who have had this problem opt to get a new battery and it usually works. The current battery will test 'good' (Delphi batteries will have still have a green 'eye'). They are just not as good as they used to be. The CCA which is not usually tested, will be way down from when new.

A quick test to see if this is your problem would be to use jumper leads when the car is warm. My guess is that it will start immediately

And


octywagon


Briskodian


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Posts:119
Joined:01-July 05
Location:solihull, West mids, uk
Car:Octy elegance TDI wagon


Posted 19 September 2009 - 22:57

new battery fixed mine :thumbup: - rwbaldwin has said it all really.

here is a link to a thread - read the bottom half,

http://briskoda.net/....en-hot/149290/

hope you get it sorted.

I had this problem on one of my cars a few weeks ago (2004 Octavia 1.9 TDi). It started fine from cold but took ages to start when warm. Turned out to be the Engine coolant temperature sensor. Hope this helps.

I have had similar problems. Finally checked out the steering column control unit which is fixed to the ignition unit. With the engine running warm up this control module with a hair drier and see if everything shuts down. It did on mine right down to engine cut out. When cooled down everything functions correctly. Try the hair drier to heat up this unit.