Pump Nozzle Problems: Troubleshooting & Repair

Hello,

I have a Caddy from 2007 with a 77kW BLS engine and 190,000 km on the odometer.
The car starts perfectly when it's cold, but it has major problems when it's warm.

Perhaps someone here can give me a tip about what I can do.

Best regards,

How does the starting process behave when using a tow start or bump start in a warm condition?

There have been numerous lengthy troubleshooting efforts online regarding warm start problems in VW TDI vehicles, which were ultimately resolved by replacing the starter motor. I had (and still have) an AFN engine.

Hi.

Disconnect the engine temperature sensor and test it, but be aware that this will likely trigger an error code.

At the AFN, I reconfigured the MSG (Message Generator) from switch mode to automatic mode, and since then, the problem has disappeared.

An AFN is not a PD.
Herbert.

However, it could still be due to a too-low starter motor speed.
Therefore: Observe/log these.

The reason why recoding some TDI engines to automatic mode can help is because it allows the engine to start at lower RPMs. When the coolant temperature sensor is disconnected, the engine control unit (ECU) assumes a very low temperature value, causing the ECU to interpret it as a cold start. During a cold start, any existing RPM threshold for starting is typically much lower, or even at 0.

There are various discussions about the "warm start" problem in this forum. Simply search for "warm start problem" and click through the similar topics (located in the bottom left corner of each topic).

Best regards, Rainer.

That was a response related to the comment before mine; it suggested that he should try it with the plug.