No memory errors in T4 2.5 TDI engine, but still experiencing problems.

Yesterday, we replaced the diesel ESP in a T4 ACV automatic 1999.
The car was started for a very long time with the faulty pump before it actually started running.
Now we have installed the other pump and have initially set it to static.
Then I tried to start it, but unfortunately, all that came out of the exhaust was white smoke.
However, I couldn't find anything in the error memory either.
Also, injection is also used.
What could it be?

On my T4 ACV 1997, the idle speed sometimes increases by 100 RPM earlier in the cold.
If I briefly restart the bus, it will be normal again.
No memory errors either.
What could it be?
I was able to already read errors with my DIY adapter and the Free VAG COM software.

Best regards, Klaus

Hello

Quote:

Now we have installed the other pump and have initially set it to static. Then I tried to start it, but unfortunately, all that came out of the exhaust was white smoke. However, I couldn't find anything in the error memory either. Also, it can also be injected.

Not so perfect...

Quote:

On my T4 ACV 1997, the idle speed sometimes increases by 100 RPM earlier in the cold. If I briefly restart the bus, it's back to normal.

Either normal because it's very cold with you or the coolant temperature sensor has a fault -> check values for plausibility.

Hello, Rainer

Quote:

Either normally because it's very cold with you or the coolant temperature sensor has a fault -> check values for plausibility

The outside temperature is unlikely to be the cause. Here, the temperature is still at least 5 degrees +.
I'm going to check the temperature sensor on my T4.

Quote:

Maybe not quite as perfectly calibrated...

The other T4 is now running.
Can the adjustment instructions from the manuals be directly applied to the T4 2.5 TDI without any modifications?

Is there a separate diagram for ACV?

/viewtopic.php?t=3195

Hello Klaus

P.S. Hello Rainer. The screws for the case were put in yesterday.

Hello,

There are several temperature sensors. Compare whether the values are approximately the same at cold start in the morning.

Regarding the diagram, yes, it's specific to engine codes. Therefore, you would need to compare them. To ensure the box actually gets into the pot in the morning, simply turn it a little more towards the morning, until it starts.

With the TDI Timing Checker, the adjustment should not be a problem

Hello, Rainer

Hello!

Quote:

Compare, whether they give approximately the same values in the morning with a cold engine.

I have. They show approximately the same thing. Only 1 degree difference.
Could it possibly also be due to dirt in the pump or injectors?
The idle increases only after the cold start.
If I restart the motor after about 2 minutes, the LL is back to normal.
It also happened once, when the engine was already warm, but the T4 had been standing there for about 1 hour.

Quote:

With the TDI timing checker, the setting should not be a problem

I can therefore only verify the injection start time using the TDI Timing Checker.
With the unregistered version, there is no chance. Or?


Another question.
How can I, for example, {ACTION}?
Measurement Block 4, Field Number 4, Key Comparison. Fuel Injection Start Valve
Measurement block 1, field number 2, Injection start
extract
That's what VW is doing, essentially. Or?

Best regards, Klaus

Klausen wrote:

I can therefore only verify the injection start time using the TDI Timing Checker. With the unregistered version, there is no chance. Or? Another question. How can I, for example, {ACTION}? Measurement Block 4, Field Number 4, Key Comparison. Fuel Injection Start Valve Measurement block 1, field number 2, Injection start extract That's what VW is doing, essentially. Or? Best regards, Klaus

Hello, the setting is performed as described in the technical article, via the measurement block 0.

Sorry, I meant Measurement block 0 Field number 2 Injection start.

Also only available in the registered version. Otherwise, the story would be meaningless.