idle adjust

[tekazgtr1984]

Anyone know how to adjust the idle? I did a TB cleaning and now my idle's sitting higher than it should (~950rpm).

 

I thought maybe the TB needed replacing but I think the temp. regulator cam spring just needs adjusting. That being said, I have no idea how to do that and before trying anything (and risking making matter worse), I'm wondering if anyone has done this before with any success.

 

I took some shots up close of the two springs, to show how the hardware sits at cold temperature. When I start up the rig, the revs jump to about 1800rpm, then sits around 15-1600rpm until it warms up, at which point idle sits at ~950rpm. That's about 200+ compared to what I thought was normal idle (750rpm).

 

 

 

Does this look right compared to your VG33E at cold temp.? I noticed that fin on the temp. reg. cam spring has two notches on it, which I assume indicated where the throttle pin should rest at cold and hot. I'm thinking adjustment can be made to the lower spring hardware but I won't try anything until I know more. In the meantime, I have to deal with this high idle and butchered gas mileage.

 

Thanks for the help in advance!

[rick88ss]

Check all of your vacuum lines. Vacuum leaks can cause a higher idle.

Edited May 19, 2009 by rick88ss

[tekazgtr1984]

[nissandoms47]

In your first picture, see the tiny phillips screw marked with a dab of paint? loosen the nut with i think an 8mm then slowly screw out the screw while watching your RPMs.

[tekazgtr1984]

In your first picture, see the tiny phillips screw marked with a dab of paint? loosen the nut with i think an 8mm then slowly screw out the screw while watching your RPMs.

 

Thanks, I'll give that a shot.

 

So it wouldn't be temp. reg. cam hardware below the TB?

[sd92129]

You may already know this, but if you disconnected the battery at anytime, the ECU will lose its learned settings and have to relearn them over the course of a few hours of driving. So the idle may be a bit off for awhile.

 

Also, when warm, idle in park or neutral should be about 950. Idle in a gear like D, 2, 1 with the brakes applied is more like 750. The ranges on these values are +/- 50 rpm.