Renault Troubleshooting: Starting Problems

Hello.

"I've been having a problem for a while now with my Renault Trafic, manufactured in 2008, with a 115dci engine (M9R). It's very difficult to start when the engine is cold. It now has 120,000 km on the clock... It takes a very long time for it to crank before it finally sputters and starts. Once it's running, there are no more problems, but the initial start is always the issue."

The following items have already been replaced or inspected:
- The preheating control unit and glow plugs have been replaced and are functioning correctly.
- Battery
- The oil cooler line was replaced.
- Rail pressure was checked and is within the correct range.
- A diesel return flow test was also performed, and everything was okay.

I've already spent a few hundred euros at the workshop, so I'm asking here to see if anyone has any other suggestions about what might be the problem.

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

"MFG" is an abbreviation for "Mit freundlichen Grüßen," which means "Sincerely" or "Best regards" in English.

What are the compression values?

Hello,


What is the initial speed? Can data be logged using a tester during engine start?

In many diesel vehicles, the fuel is only "released" after a certain engine speed has been reached during startup.


Regards, Mpire.

Compression has not yet been tested.

I think it's around 300 rpm, which is what I've seen. Is that too low? It starts quite slowly even with the new battery...

Starting the car today in -19 degrees Celsius was a real ordeal - it gurgled for a long time, then coughed, and that happened several times before it finally started...

Remove the starter motor, disassemble it, verschandeln it. If the brushes are worn, replace them. Lubricate with grease that does not harden, and then reassemble.

The fresh oil we recently put in our AFN engine in the Galaxy has worked wonders; it was sluggish before, but now the starter motor is working properly again.

It takes some time, but if the coal is intact, it costs exactly €0.00.

Okay, thanks, I'll do it over the weekend.

Stay tuned!

I installed a new starter. It spins faster, but it still starts very hard. } When it does start, there's a huge white cloud. } I'm at a loss. }

Measure the compression; there must be sufficient pressure for a diesel engine to start.

Manufacturer specifications typically range from 22-25 bar. Diesel engines usually start relatively well up to 20 bar, good values are around 28-30 bar, and the pressure should be consistent across all cylinders.

Aha ok..
Could that be the case at 130,000 km?

Engines can do a lot, and there are engines that last 600,000 km and others that don't even last 50,000 km.

Since compression is a crucial factor for diesel engines to start, I'm checking it.