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TOPIC: 1994 Toyota 4runner

1994 Toyota 4runner 20 Feb 2021 19:59 #25

  • Mike Miller
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Quick search online and found a pic. This will adjust the idle for 3.0 v6. CCW will raise it and CW will lower it. Its just a needle pointed screw that adjusts the airflow. 22 re looks the same just on top of the TB.

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1994 Toyota 4runner 24 Feb 2021 00:45 #26

  • Tracy Gallaway
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Hi Mike, hey if you have any pics of this I'd appreciate it. I think I've possibly seen this on older Toyota's, these engines always had mystery about them . It often seemed like things should be obvious- like I'm just looking at this thing, and it felt like thinks were somehow hidden.
Thanks Mike!
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1994 Toyota 4runner 24 Feb 2021 20:32 #27

  • Mike Miller
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Here's some pictures of the early Toyota TBs. First one is the 3.0 the "idle adjustment screw" is on the side just behind the accelerator cable spring. The second pic is for the 22re, circled red, its on top of the TB. I was surprised years ago, when a mechanic friend showed me this. Being able to adjust idle on an EFI system, almost like a carb came in very handy.

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1994 Toyota 4runner 24 Feb 2021 20:47 #28

  • GregK
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I would bet that those idle adjust screws are to allow for fine-tuning of the variances allowed in manufacturing (and aging of the vehicle)...throttle cable stretch, miniscule vacuum leaks - these sorts of things.
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1994 Toyota 4runner 25 Feb 2021 18:00 #29

  • Mike Miller
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As a follow up, there is an o-ring around the screw that gets old and degraded over time. This o-ring is what keeps the tension on the screw so it doesn't "self adjust" with engine vibration. It can be unscrewed all the way out and easily replaced.
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1994 Toyota 4runner 25 Feb 2021 23:18 #30

  • Tracy Gallaway
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Thanks, Mike! Both your info here, plus Greg K's addition, would have come in really handy a few years back when I was working on a mid-eighties Toyota Celica w/ the 22R 4 cylinder. Toyota seems to be one MFG. that needs some "decoding" at times. If I recall the idle RPM was too high, that O-ring on this idle adjust screw might have been the culprit:pinch:
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That's what this forum is for!!

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1994 Toyota 4runner 26 Feb 2021 08:56 #31

  • GregK
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Tracy Gallaway wrote: If I recall the idle RPM was too high, that O-ring on this idle adjust screw might have been the culprit:pinch:
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That's what this forum is for!!

TracyG


Agreed! we're all about the knowledge (both sacred and arcane) of making engines run better here!
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