IBIZA 6K with engine code 1Z, no power

Hello fellow community members!

As a beginner, I'm looking for help. My Ibiza with a 1Z engine has no power throughout the entire RPM range and only revs reluctantly. Error code 575 was displayed.
The initial diagnosis from the specialized workshop indicated a faulty turbocharger. However, the original replacement part was too expensive for me, so I removed it and had it refurbished – but that didn't work.
Then I came to the conclusion myself, after reading some posts on similar topics here, that it was probably the N75 valve – I replaced it, but it didn't work.
Have it checked again by a qualified mechanic - error code 575. I obtained a used control unit because the mechanic was about to install a new one immediately - but no success! However, since then, no errors have been displayed, so the 575 error is gone.
I didn't replace the pressure hoses that are often mentioned, but I checked them all – and they were all leak-free and undamaged.
The piping is completely leak-proof, and the intercooler was replaced two weeks ago as part of an accident repair. All lines were checked at that time, and everything is in good condition.
I don't know what to do.

Is the pressure build-up in the small pressure lines correct, and is the injection start time accurate?
Since when has it not been working? Was it sudden or after a repair?
Can you possibly see a lot of air bubbles or foam in the supply line when the vehicle is running?
Do you hear a whistling or hissing sound when you try to accelerate properly, or not really?

Hello,
Thank you for the answer!
The hose connections should be correct, as I removed each hose individually, checked it, and then reinstalled it. Is there perhaps a diagram or overview showing how the hoses should be connected?
Unfortunately, I can't say whether the problem appeared suddenly or gradually, as my wife primarily drives this car and she didn't even notice it until I told her. However, no repairs were necessary in this case, as I usually repair my cars myself whenever possible. It did have some damage from a rodent chewing on the small pressure hoses previously – I replaced one of those.I haven't specifically checked for air bubbles yet, but I will do so. The fuel filter has definitely been replaced. It doesn't misfire or smoke, and it starts really well, even in cold weather, sometimes without glow plugs.
Unfortunately, I hear no whistling, hissing, or similar noises, and the entire pressure range appears to be sealed. At least, there is no visible oil leakage, and I can't hear anything either.

I almost missed this – if I remember correctly, the fuel injection start should be 2-3°, but when I read it with VAG COM, I get 1.1°.

Jimmy.ghost wrote:

I almost missed this - the start of injection should be, if I remember correctly, 2-3°, but when reading it with VAG COM, I get 1.1°

.

Before or after overtime? In default settings mode or not?
See the technical article on how to adjust the ESP (Electronic Stability Program).

Is the charging pressure too high or too low? Should the target value be tested under specific conditions?

Hello Rainer,

Thank you for the response.
'1.1° before top dead center' is the value I get from VAG COM, but not in the basic settings mode. I'm using the shareware version, so I can't access that function. (I'll probably buy the full version now, as it seems necessary to do this.)
I can't tell you the boost pressure yet – I haven't gotten that far with VAG COM. So far, I've only read out measurement blocks 01-04 (i.e., idle), and even block 00 doesn't work because of the shareware limitations. I've read the technical article on systematic troubleshooting, but so far I've only performed the basic checks – I haven't done the flow test, but anyway, you can't really talk about airflow anymore.
'I don't understand 'testing setpoint after boundary conditions' - is there somewhere I can read about this?'
I don't see any air bubbles in the hose connecting the filter to the pump when the engine is idling.
'Sorry if I don't provide more detailed answers, but I'm basically still an 'apprentice'.'

Hello,

Occasionally, the pulley for the timing belt on the crankshaft comes loose in the 1Z engine, which can lead to starting problems and a loss of power (a late-stage symptom, just before complete failure).
However, a problem with the turbocharger's boost control system wouldn't necessarily be related to that. As long as you're not experiencing any starting problems, I wouldn't investigate that area too deeply.
I would first re-check the turbocharger pressure regulation system and then examine how the boost pressure is regulated at full load (and record it).
Is the wastegate common and does it get stuck? Is the pressure sensor working correctly and is it leak-proof?
It's likely that at some point, the boost pressure will become too high for your vehicle and cannot be regulated by the control unit, which will then trigger error code 575.
Also, check the boost control valve or simply replace it as a precaution, especially if the wastegate and its hoses are okay.
Because if the wastegate control valve intermittently malfunctions, you can find yourself in a very frustrating situation.

You can check the wastegate as follows: Refer to the technical article on vacuum hoses; it will show that without any boost pressure applied to the pressure sensor, the wastegate should open at approximately 0.6 bar.
Schlauch abziehen -> Testfahrt -> Ladedruck angucken -> immer noch zu hoch ? Wastegate is stuck.
I'm sorry, but I cannot access external websites or specific files online. Therefore, I am unable to translate the text from the provided URL.

Best regards, Rainer.

1. No one here has said anything about the mass airflow sensor .

Check den doch mal mit VagCom .

Under certain circumstances, the control valve in the ESP (Electrostatic Precipitator) can also be defective!
3. I don't know if the "1z" now has e-fuel. If it does, check to see if it goes up to 100%! So, full throttle!

Best regards, Farni.

Sure, the 1Z Egas .

Otherwise: Log everything and show it here, then you can definitely get help.

As far as I know, the shareware version can also log data.

If you need a German label file:

http://people.freenet.de/golf-schrauber/028-906-021.lbl (thank you to Ulf)

Okay, please provide the German text you would like me to translate into English. I will only provide the translation.

Hello everyone,
First of all, a big thank you to everyone for the many responses!
I will follow this strategy:
Replace inner tube.
2. Log or record the boost pressure.
3. Possibly check the wastegate and its control system by disconnecting the hose.

I requested the full version of VAG-COM last night and will log everything I can, to the extent that my knowledge allows.
However, it will be postponed to the weekend, as I hardly have any time in the evenings during the week.

I would also like to commend this forum and its members very highly! There isn't a day that goes by when I don't learn something new.
Thank you again for that!

Best regards,

Jörg.

Hello everyone,

I've now completely replaced the inner tubes, but it still hasn't worked.
I then used VAG COM to log the measurement blocks 11, 10, and 8. From the recording, I can see that my boost pressure is approximately 300-400 mbar below the target value. If the target value is around 1850, I'm getting about 1450.
How can I upload my log file here?

Thank you and best regards.

Jörg.

Hello, you simply click the 'Add Attachment' button and then select your log file, which will then be attached to your reply.

With the risk of exposing myself again... I can't find the 'Add Attachment' button [/img].

Hi,

As a regular user, you cannot attach files here. However, you can include links to your own web space.

Quote:

Hello Rainer, Attached are the CSV files - I have 2 of them. Here are the standard pressure readings: blocks 008, 010, and 011. For the second test, I connected the hoses from the turbocharger outlet and the wastegate. If I understand correctly, the wastegate should open at 0.6 bar, but it's not opening. The pressure is increasing to approximately 1160 mbar. Could the wastegate be defective...? Thank you for your help! Regards, Jörg.

Best regards, Rainer.