3.4 Idle adjustment
#1
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3.4 Idle adjustment
I was wondering how to adjust the idle on a 3.4 V6. I just swapped one into my truck, and its running fine, but seems to idle a bit high. On my 3.0 you would just adjust the distributor, but the 3.4 is distributorless, and is timed by the position of the timing belt, which cannot be adjusted. Is it computer controlled and cant be changed?
#3
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Originally Posted by MorphiasX
Is it computer controlled and cant be changed?
#4
A couple ideas to check since this is a computer controlled feature:
1. Idle-up feature of the A/C when engaged.
2. Throttle cable
Jamie's right though, this is going to take some time to track down.
1. Idle-up feature of the A/C when engaged.
2. Throttle cable
Jamie's right though, this is going to take some time to track down.
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#9
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Originally Posted by DavidA
I thought there was a screw adjustment on the throttlebody spring?
On a 5VZ (3.4L), no there isn't one.
The ECU uses the IAC valve to control idle on the 3.4L
.....which might be something to look at for this high idle condition.
Last edited by MTL_4runner; 04-20-2006 at 02:29 PM.
#11
Originally Posted by MTL_4runner
On a 3VZ (3.0L), yes, there is one.
On a 5VZ (3.4L), no there isn't one.
The ECU uses the IAC valve to control idle on the 3.4L
.....which might be something to look at for this high idle condition.
On a 5VZ (3.4L), no there isn't one.
The ECU uses the IAC valve to control idle on the 3.4L
.....which might be something to look at for this high idle condition.
#12
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Also, the idle surges. It will be running a little high, then for a split second drops to a lower rpm (one that is a little more desireable) then back to the higher rpm. I havnt done the resistor mod to my tach yet, so im not sure of the actual RPM as of yet.
#13
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Originally Posted by IS3004Runner
May I ask where is the IAC valve? sometimes, my truck is idling around 600 rpm on drive with my foot on the brake, i can feel vibrations on the seat. I have to put it in neutral as it gets annoying sitting on the traffic. once in a while it idles at 750 rpm, which is the desirable engine idle speed.
http://www.4x4wire.com/toyota/mainte...tenancep5.html
#14
Originally Posted by IS3004Runner
May I ask where is the IAC valve? sometimes, my truck is idling around 600 rpm on drive with my foot on the brake, i can feel vibrations on the seat. I have to put it in neutral as it gets annoying sitting on the traffic. once in a while it idles at 750 rpm, which is the desirable engine idle speed.
#15
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Originally Posted by kode3
This is what my 2001 is doing, I posted about this but and have changed the spark plugs and fuel filter with no change.
#17
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Originally Posted by kode3
I sure did, I used FI Throttle Body cleaner from Napa.
Keep in mind the idle will drop by about 100 rpm when the AC (or windshield defrost) comes on.
Last edited by MTL_4runner; 04-26-2006 at 04:48 AM.
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