2015 Golf TDI long crank first start of the day

drewpul

Member
Joined
Sep 2, 2019
Location
Glen Ellyn, IL
TDI
2015 VW Golf Sportwagen S TDI - Silk Blue Metallic
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.
 
Last edited:

pedroYUL

Top Post Dawg
Joined
Sep 8, 2011
Location
MI, USA
TDI
2015 Passat CVCA; 2015 GSW CRUA; 2012 wagon CJAA; 2004 wagon BEW(brother)
More battery than alternator, but yes, good investigating!
 

ticaf

Veteran Member
Joined
Nov 15, 2018
Location
US Mid-Atlantic
TDI
Stock 2015 Golf SW S Manual TDI
You mentioned temperature....
Did you check all the temperature sensors, are they all working?
 

VAGent

Member
Joined
Dec 22, 2023
Location
Schiller Park, IL
TDI
2015 Golf Sportwagen TDI
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

Member
Joined
Sep 2, 2019
Location
Glen Ellyn, IL
TDI
2015 VW Golf Sportwagen S TDI - Silk Blue Metallic
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?
 

drewpul

Member
Joined
Sep 2, 2019
Location
Glen Ellyn, IL
TDI
2015 VW Golf Sportwagen S TDI - Silk Blue Metallic
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.
 
Top