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Skoda Octavia BKC Starting Problems

 
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Beitrag06-11-2018, 19:09    Titel: Skoda Octavia BKC Starting Problems Zitieren

I'm having a problem with my Skoda Octavia, which doesn't start when warm.

I initially thought it was a common issue, so I increased the throttle position sensor, but unfortunately, that didn't fix the problem.

I checked the throttle angle, which was jumping between 0 and 0.5° in the LL, so it's not the G40.

Then I disconnected the coolant temperature sensor, and it still wouldn't start. I then checked if disconnecting the G62 showed any readings, and it was always showing around 40-44° when the connector was disconnected. I then used a 4.7k resistor, and it showed 4.5° in the MWB. That seems too high to me.

I also measured the fuel pressure at the fuel pump, which was 2.7 bar in the LL, but should be at least 3.5. When I press the return line, it rises to over 10 bar, so the PD-O-rings should also be okay.

If I stop and restart immediately, it starts right away. If I wait for 2 minutes, it may take up to 20 seconds to start. You can see on the gauge that there's initially no pressure, which then slowly increases, and then at around 1.5-2 bar, it starts.

If I activate the electric pump, the gauge on the fuel pump shows around 0.05 bar.

If I let the car stand for half an hour, it starts normally again.

The error codes for the LMM and G62 are present because I disconnected them.

Here's the throttle position sensor data: at 4.5° it should normally request around 170Nm, and the actual value is around 29mg/H.

I didn't raise the throttle position sensor to 0, and that was just a test to see if it would start.

I first performed the throttle position sensor test, and then all the other tests.



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Log-TMBBS61Z158xxxxx-132910km.txt
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 Skoda Octavia BKC Starting Problems
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Beitrag06-11-2018, 22:10    Titel: Skoda Octavia BKC Starting Problems Zitieren

[quote]
Then I disconnected the coolant temperature sensor, and it still didn't start better. Then, at the very end, I checked what temperature the G62 displayed when I disconnected it, and I always thought it would show some negative temperatures. Instead, it shows 40-44° when the sensor is disconnected. I then used a 4.7k resistor, and it shows 4.5° on the G62. This seems too high to me.
Does the data set include both the original data and data adapted for the engine/control unit?

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Beitrag07-11-2018, 12:47    Titel: Skoda Octavia BKC Starting Problems Zitieren

According to Partslink, a 016BE should be installed.

While I haven't checked if it's been modified, when I imported it, it suggested a 100% identical one, and it's an older gentleman. However, I will still check to see if it's the original.
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Beitrag07-11-2018, 19:35    Titel: Skoda Octavia BKC Starting Problems Zitieren

If original, I would check the various connection cables for damage from rodents or other causes. The incorrect measurements could only have a limited number of causes...

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Beitrag08-11-2018, 11:11    Titel: Skoda Octavia BKC Starting Problems Zitieren

Is the starting speed too low?
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Beitrag08-11-2018, 18:59    Titel: Skoda Octavia BKC Starting Problems Zitieren

[quote="RĂŒdi"]Is the starting RPM too low?[/quote]
In the "Startmenge.jpg" image, he allowed the injection amount at a RPM of 0. icon_wink.gif
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Beitrag09-11-2018, 20:59    Titel: Skoda Octavia BKC Starting Problems Zitieren

[quote]Then I measured the fuel pressure on the tandem pump; it was 2.7 bar in the LL, but should be at least 3.5 bar. When I press on the return line, it rises to over 10 bar, so the PD-O-rings should also be okay.[/quote]
Unfortunately, this only states that 10 bar of pressure is being applied. There are also cases where higher pressure can shift/press the sealing rings into a different position, which may result in sealing again.
If I stop and immediately restart, it starts up immediately. If I wait for 2 minutes, it takes about 20 seconds to start. You can see on the gauge that there is initially no pressure, which then gradually increases, and then at around 1.5-2 bar, it starts.
Okay, I understand. Please provide the German text you want me to translate. I will translate only the readable text, leaving the HTML tags, BBCode tags, and URLs as they are.
How does the pressure build up in the cold state?

If the engine really reaches enough starting speed and the PDS is activated, then the only remaining cause should be air... unless the airways are blocked, for example, by a throttle or parking valve.
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**Technische Fragen bitte ins Forum und nicht in mein Postfach**
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Beitrag10-11-2018, 13:50    Titel: Skoda Octavia BKC Starting Problems Zitieren

Even when cold, it starts immediately.

If it doesn't start, I have a starting speed of 250 RPM, so I also changed the starting fuel injection setting. I haven't checked if the PDEs are being controlled yet.

I have also checked the throttle and the parking valve.
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