Hello.

 

I have a Scoda Octavia Scout 4x4 with a BMM engine.

 

It's cranking a bit long before it starts, comparing with other diesels.

 

This occurs both when it's warm and cold outside, but perhaps especially when it's cold. One morning when it was -16.5c celsius it seemed to crank fine but wouldn't start. When i jumped start it with the help of another battery it started.

 

Another morning when it also was more or less as cold outside it started rather fast. It tends to start a bit faster when it's warm than cold but usually not immediately when it's warm climate neither.

 

If it only occured when it's cold outside, i'd suspect the glow plugs - i may still be but i've had another car with bad glow plugs and only experienced the issue when it was cold outside.

 

I've measured the battery, it's 12.4 volts and goes down to around 10 volts when starting. It's old, so i'm going to change it - However, it still cranks rather fast so i don't think changing the battey will fix it.

 

I have some MAF-sensor cleaning spray laying around, and figure it doesn't hurt to try cleaning that as well. I was thinking about cleaning the MAP/pressure boost sensor as well. I saw there is another sensor on top of the engine most to the left - Is it a MAP sensor or a boost pressure sensor? I've only heard about people cleaning the MAP sensor so if it's a boost pressure sensor i'll skip it.

 

Another thing, the first few seconds after a cold start it seems a bit weaker as well... I have to give it some more gas for it not to stop when taking off. Other than that, it runs completely fine, pretty much always starts, have a completely even idling also at cold start. It's just the long cranking time, which is a bit more but not only, during cold starts. It has also happened that it starts rather quick when it was -15 which makes me not sure that it's related to the glow plugs. That might be something to measure, however...

 

Does anyone have any suggestion or have experienced anything similar with their Scoda Octavia Scout 2008 model?

Welcome.

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What country are you in?

 

I assume that the diesel you get is to suit your climate so waxing is not an issue.

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Has the fuel filter been replaced in recent times or years? 

I have similar problem, but I have 2 liter petrol, so also looking for solution (maybe something similar).

For me happens when I haven't driven for some time.

Thank you.

 

I'm from the Nordic part of Sweden. Luckily i have the engine pre-heater installed which is common here.

 

I just bought the car, according to the service Book the fuel filter was replaced 1100km ago so quite recently. The car has only gone 165.000km.

Just now, JonathanOctaviaScout said:

Thank you.

 

I'm from the Nordic part of Sweden. Luckily i have the engine pre-heater installed which is common here.

 

I just bought the car, according to the service Book the fuel filter was replaced 11000km ago so quite recently. The car has only gone 165.000km.

 

Check the oil level in the car. If there is a leak in the fuel system it could be causing the oil level to rise 

The oil level is fine, thanks.

 

 

Any more ideas?

You should really get a comprehensive diagnostic and history report with something like VAG Com. My thoughts are turning to a sensor failure such as a crankshaft or camshaft sensor failure.

 

 

Thanks.

 

Yes i'll probably have to diagnose that with a good scanner, planning on buying one later one.