2015 Golf TDI long crank first start of the day

[drewpul]

I've actually changed the oil twice this year thinking that it may be contributing to this problem.

First I ran some Mobil 1 in it for 2,000 miles or so. Then ran LiquiMoly engine flush for 15 mins. And then put in Rowe 507 spec oil. 5w-30 of course.

One other random thing I tried.... I put the car on my 5amp trickle charger overnight. And both yesterday and today it started without any hesitation. I'm going to continue this experiment a couple more days. See if it's a random fluke. But if this solves the problem, that would point to battery/alternator.

EDIT: This was a random fluke. The trickle charger had no consistent impact.

 

[pedroYUL]

More battery than alternator, but yes, good investigating!

 

[ticaf]

You mentioned temperature....
Did you check all the temperature sensors, are they all working?

 

[VAGent]

I had long crank issue in the morning only if the outside temperature is higher then 55-60.
No any results after I changed:
- battery
- glow plugs
- glow plugs control module
- VVT
- lifter pump
- proper timing (camshaft and hpfp)

Only when I finished with retrofit of CP3 with proper tune - FINALY EVERYTHING LIKE IT SHOULD BE)

 

[drewpul]

I had long crank issue in the morning only if the outside temperature is higher then 55-60.
No any results after I changed:
- battery
- glow plugs
- glow plugs control module
- VVT
- lifter pump
- proper timing (camshaft and hpfp)

Only when I finished with retrofit of CP3 with proper tune - FINALY EVERYTHING LIKE IT SHOULD BE)

What is CP3 retrofit?

 

[VAGent]

What is CP3 retrofit?

CP3 High Pressure Fuel Pump

 

[drewpul]

Thanks VAGent. I was totally unaware of the CP3 vs CP4.1 and just read a bunch. Thanks for your posts in the CP3 threads.

 

[whizznbyu]

CP3 High Pressure Fuel Pump

Is this the correct CP3?
Bosch CP3 Common Rail Injection Pump Duramax (dieselpowerproducts.com)

 

[VAGent]

Is this the correct CP3?
Bosch CP3 Common Rail Injection Pump Duramax (dieselpowerproducts.com)

Mk7 US Spec CRUA CP3 Fuel Pump Upgrade Kit

CP3 Fuel Pump Upgrade Kit for US Spec CRUA 2.0 TDI Common Rail Engines

www.darksidedevelopments.co.uk