Poor cold start - faulty fuel injection pump?

I went to VW today to have the immobilizer coded for my new instrument cluster...
In this case, the car needs to be started briefly using the keys.
'And mine just doesn't start up very easily. You don't have to crank it for long, but it does take a second or two for the starter to engage...'
The nice gentleman from the workshop immediately said that the fuel injection pump was defective.

I'm not an expert, but I'm not entirely convinced by that explanation... Also, it always starts right away when it's cold.

The amount of fuel being injected with a warm engine is correct; I've had it checked multiple times. I also temporarily disconnected the temperature sensor to test it. However, it still happens occasionally that the engine doesn't start immediately when it's warm.

Does anyone have any ideas?

Okay, the engine is the 110 horsepower AHF in the Golf IV.

Hello,

What values did you get for the fuel injection amount during a warm start?

Draven wrote:

"And mine just doesn't start up very easily. You don't have to crank it for long, but it does take a second or two for the starter to engage..." The nice gentleman from the workshop immediately said that the fuel injection pump was defective. and I also once tested by disconnecting the temperature sensor.

However, it still happens occasionally that it doesn't start immediately when it's warm...

Hi.

My 110 starts warm from delivery, but runs rough when cold.

This can be partially corrected by adjusting the injection amount (by moving the pump head), but then the car will jerk more noticeably at low RPM .

I suspect that the amount of memory allocated for warm start might be a bit too small in some software installations.

Does your car also start better when the temperature sensor is disconnected?

Unfortunately, I never checked the values myself, but always had it done at the workshop. 'Back then, it didn't have a diagnostic connector yet...'

with reduced temperature. Unfortunately, the engine didn't start much better with the new sensor.

I suspect it might be related to the pump. During the timing belt replacement, they probably didn't adjust the pump correctly – or they adjusted something incorrectly. After that, it almost wouldn't start at all; it only started after cranking the starter for almost a minute, and then it produced a lot of white smoke.
It wasn't until after another visit to the workshop that it started working again.

Could it be that this adjustment has caused permanent damage to the motor or the pump?
Or perhaps the pump isn't quite adjusted correctly?

Hi.

The starting behavior is, of course, also dependent on the timing of the fuel injection or injection start.
Even more so than the partial load behavior, because during startup, the injection timing control is not yet active (NBF signals cannot yet be evaluated at the starter motor speed).

So, if the workshop is "capable" of making a mistake with the initial pump settings, why should they be perfectly accurate now, after the adjustment (and in the same workshop)?