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86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

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Old 05-25-2009, 06:52 PM   #1
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Adjusting Idle on a '91 Toyota v6 pickup 4wd.

Does anyone know how to adjust the idle on a '91 v6 4x4? It is set so low it loaps and goes dead on me. I think you have to have a special tool. Someone PLEASE help. I am sick of it going dead at redlights. . Thank you.
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Old 05-25-2009, 07:01 PM   #2
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On my 92 3VZE there's a large flat blade screw that you use to adjust the idle right on the front of the intake facing the front of the engine. It's dead obvious, just grab your largest flate blade screw driver, pop your hood and look near the large intake hose as it enters your engine.

I'm sure if you use the search a little you'll find a picture, if not I can run out and snap one.
Just turn the screw while the trucks running and you'll notice the difference - I just went by quarter turns of the adjuster screw....

Just went outside to look, there's even a small "TOYOTA" imprinted on top of where the screw is located - screw faces directly forward.

Last edited by snelson; 05-25-2009 at 07:09 PM.
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Old 05-25-2009, 07:34 PM   #3
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yep, thats what i do for my idle....always seems to drop back down after a while though.
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Old 05-26-2009, 07:08 AM   #4
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Here is what I had to do to mine. I adjusted it and it kept going back down(the ECU adjusts it). So I jumpered the service connector and still did it. So to get it to finally set here is the steps I took:
1. Bought Carb & Throttle body spray cleaner.
2. Removed hose to Throttle body so I could see into TB
3. Removed the screw entirely, sprayed it clean, had alot of carbon buildup on it. Put the little hose on the cleaner spray can and sprayed the crap out of the hole where the screw goes.
4. Sprayed all inside the TB, cleaned the butterfly, walls of the TB and the hole at the bottom under the butterfly.
5. Put it back together.
6. Started truck, let it warm up completely, made sure AC was off.
7. Jumpered the diagnostic connector, reved it a couple times and let it get back to idle.
8. Adjusted to 750 RPM, removed jumper.

Has been fine since. Good luck.
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Old 05-26-2009, 09:28 AM   #5
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Nelson, i would love to see the picture because mine is not a flat screw unless it is hidden to the side that i can not see or something. Thank you for the replies.
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Old 05-26-2009, 09:32 AM   #6
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this look familiar>?

Click the image to open in full size.
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Old 05-26-2009, 01:31 PM   #7
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You need to find out why the idle is so low in the first place. I doubt if the screw just turned itself in one day. Turning it out may help but I bet there are other contributing factors at play. Maybe the TPS is out of specs? Not only will it effect your idle but your timing as well.
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Old 05-26-2009, 04:32 PM   #8
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aha! i saw that but thought it had nothing to do with the idle because it screws almost all the way out. i am going to try that.
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Old 05-28-2009, 08:50 AM   #9
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I am trying to fix the same problem. Truck stops to keep low rpm when I was stuck in mud it happed suddenly.

No error codes, TPS fine, spark plugs, spark wires fine, distributor fine, voltage on ECU fine, resistance on ECU connector fine except +B E2 (looks like no connection should be 0,2-0,4 k ohm. Air temp sensor fine, air flow measuring fine. I didn't check oxygen sensor jet but its connected.


There is no motor on TB so it looks like ECU should give correct fuel amount to keep low idle.

What about EGR ?

One interesting think - car runs the same with TPS disconected. TPS has correct resistance.

Last edited by xmaro; 05-28-2009 at 09:05 AM.
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Old 05-28-2009, 08:50 AM
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1984, 91, 94, adjust, adjusting, adjustment, idle, low, o2, pickup, sensor, speed, toyota, toyotav6, tps, truck, v6

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