T5 Hard Starting: Troubleshooting & Fixes

Hello!

"Today I had a problem where my T5 2.5L PD AXD from 2006 wouldn't start in the morning, even after cranking for a long time. It only started after a while when I tried using starting spray."

I replaced the DFI (Direct Fuel Injection) system about 30,000 km ago.

I've generated some log files; could someone please take a look at them?

"Thank you, Chris."

Have you checked the values from the temperature sensor to see if they are providing reasonable readings?
It's important that the engine is cold.


To test the spark plugs, it would be interesting to know whether ceramic glow plugs are used.
You can identify them by the white or green marking on the spark plugs. You should be able to see this even with the connector unplugged. The ceramic spark plugs have a white marking.

Okay, thanks, I'll check that out.

It's not easy to access the glow plugs on a T5 AXD.

What's slightly concerning is the LL (Longitudinal Load) value of 2.2 on cylinder 1; the other cylinders are quite similar.

Hello,

Is the PD unit leaking? The high LL value is very noticeable – it would be very unfortunate and costly!

"That sounds like a good fit. How many kilometers are on the engine?"
Are there any issues with a warm start?

Some people in the Touareg forum are struggling with this issue as well; some have had the units re-sealed, while others need to replace the entire head.

Hopefully, it's just a sensor or the glow plugs!

Sure thing! Please provide the German text you would like me to translate into English. I will only provide the translation without any explanations.
Alevuz.

120,000 km

There are no problems when the engine is warm; this issue occurred for the first time today, and we experienced temperatures of -18 degrees Celsius today.

Hello,

Cylinder 1 is at the limit; further monitoring is essential.

The cause of the starting problem is not him, but first, as already mentioned, check the temperatures in measurement block 7. This is especially important if the engine is cold.

Best regards, Rainer.

Can the measured value block (MWb) of the idle speed control actually be used to determine whether the sealing rings of the common rail injectors are functioning correctly, or is that unrelated ?

Thank you, Chris.

It's an indicator. If everything else were absolutely fine, then it would be a fairly good sign.