FYI VVT min/max duty and cold weather startups
04-07-2021, 06:46 AM
#1
Elite Member
Thread Starter
Join Date: Mar 2006
Location: Schwarzenberg, Germany
Posts: 1,554
Total Cats: 101
FYI VVT min/max duty and cold weather startups
Hi,
I just wanted to share a finding, that lately really annoyed the hell out of me.
My cold start tests in the cold weather (~0°C/32°F) were very bad, with very rough idling, and hickups during the first minutes of a drive.
Looking at the logs I realized after a while that the VVT angle was way too high, even with minimum duty. (I did the complete setup procedure and found all the sweet spots for
min/max duty etc.)
Problem with the cold weather and quite thick oil (10W60) seems to be, that the VVT is not able to get the VVT angle into the correct position.
I changed the min. VVT duty to 0 and everything was fine again - VVT angle got back to the commanded position.
I just wanted to share a finding, that lately really annoyed the hell out of me.
My cold start tests in the cold weather (~0°C/32°F) were very bad, with very rough idling, and hickups during the first minutes of a drive.
Looking at the logs I realized after a while that the VVT angle was way too high, even with minimum duty. (I did the complete setup procedure and found all the sweet spots for
min/max duty etc.)
Problem with the cold weather and quite thick oil (10W60) seems to be, that the VVT is not able to get the VVT angle into the correct position.
I changed the min. VVT duty to 0 and everything was fine again - VVT angle got back to the commanded position.
Reply
0
0
Thread
Thread Starter
Forum
Replies
Last Post
