Variable Valve Timing (VVT) ES300
#1
Pit Crew
Thread Starter
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
Do the VVT solenoids (Bank 1 and 2) affect engine idle in any way if they are not working properly?
I understand how a poorly functioning VVT affects acceleration, but do they cause poor idling as well?
I understand how a poorly functioning VVT affects acceleration, but do they cause poor idling as well?
#2
Lexus Champion
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
I don't think the VVTi system is active at idle. You could quickly find out by disconnected the oil control valves.
#3
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
Yes, often they can cause a rough idle/stalling when warm. The reason is that the VVT 1MZ uses valve trickery - through VVT operation - to achieve the same effect as the older, non-VVT motor did using dedicated EGR hardware.
EGR is not on during cold start or WOT; only at warm idle or part-throttle operation. So if the VVT system is not working properly, EGR isn't either and you get the same symptoms - problems at idle and WOT.
But VVT codes are pretty cut-and-dried, you'll almost always get a specific code for a solenoid or misfire codes for a whole bank.
EGR is not on during cold start or WOT; only at warm idle or part-throttle operation. So if the VVT system is not working properly, EGR isn't either and you get the same symptoms - problems at idle and WOT.
But VVT codes are pretty cut-and-dried, you'll almost always get a specific code for a solenoid or misfire codes for a whole bank.
The following users liked this post:
ES300TX (12-02-17)
#5
Thread
Thread Starter
Forum
Replies
Last Post
wan8dan
ES - 1st to 4th Gen (1990-2006)
3
09-03-13 05:31 PM