G4 90 PS TDI: Starting Problems & Solutions

Hello.

My friend's Golf 4 starts well when it's warm, but when it's hot, you have to crank it for a while before it finally starts!

Was könnte die Ursache sein? Ein Temperaturfühler? Welcher? UAnd why?

Best regards,

Sure, here is the translation of the text from German to English:

'Didl' is a German word that means 'a small, round object.' It can be used to refer to a variety of things, such as a ball, a marble, or a button.

Here is an example of how the word 'Didl' might be used in a sentence:

'The child was playing with a Didl in the garden.'

didl wrote:

It starts well in the warm state, but if it is warm , you have to "crank" it for a while

.

What is the author trying to tell us with this

Oh shoot... sorry!

When it's in a warm state, it doesn't start well.
Great in the cold!

didl wrote:

oh sh...t, sorry! When it's warm, it starts poorly. good in the COLD!!!!

Hi.

Then try using the search function .

In addition, there is a technical article (regarding preheating systems and other starting problems).

If you have read everything and tried it out on the car, please post the results again - then we can see what to do next .

It starts well in the warm state, but if it is warm , you have to 'crank' it for a while, .

What is the author trying to tell us with this

Hello,

It could be due to the initial fuel injection amount, as less fuel is injected when the engine is warm.
If the starter motor is still a bit slow, it won't be enough.

Lois wrote:

It could be due to the initial amount, as less fuel is injected when it's warm. If the starter motor is still a bit slow, then it won't be enough.

Hi Lois,

Besides that, there are also several other possibilities...

Since you're new here:
To avoid having to painstakingly list out all the possible causes for these frequently encountered problems each time (and to prevent the forum from being endlessly cluttered), Rainer's website now features a large number of articles covering frequently asked questions.

Regarding your previous answer:
If a car newly also starts well when warm, but the warm start becomes worse with increasing age, it will likely be due to various factors, but rarely to the pre-programmed (and therefore fundamentally unchangeable) starting quantity.

So, for example, it's more likely to be related to the starter motor, which gradually becomes weaker due to corroded cables - and exactly those kinds of things are described in the aforementioned technical article .

Hi,

First, use VAG-COM to check the fuel injection start and valve timing (the locking pin must fit into the ESP wheel when the crankshaft is at its top dead center position, see the search function for crankshaft pulley), especially if the engine is difficult to start after a few hours of standstill (cylinder head is slightly warm).