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Mystery box

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Old 01-01-2011, 07:25 PM
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Mystery box
while doing the clock mod today I came across a box/ module looking thingie directly behind the glove box. It has a knob labled RPM, and "+", and "-" , any idea what the heck it is ?
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Old 01-01-2011, 07:30 PM
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Probably changes the idle rpms....
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Old 01-01-2011, 08:50 PM
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Thought the main engine computer took care of all that ??
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Old 01-01-2011, 08:54 PM
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why don't you go outside, start the truck, and turn the knob?
if it raises the idle you'll know?
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Old 01-01-2011, 08:57 PM
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Maybe tomorrow ....
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Old 01-01-2011, 08:57 PM
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Take a picture. Sounds like an aftermarket part someone put on.

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Old 01-01-2011, 09:00 PM
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Appears to be stock, sis bought new in 89 and I've had it the past 8 years. Will take pic tomorrow .
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Old 01-01-2011, 09:00 PM
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Originally Posted by Blue 89 Runner
Appears to be stock, sis bought new in 89 and I've had it the past 8 years. Will take pic tomorrow .
dude you're in vegas, nobody is going to care if you go outside and start your truck for a minute..
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Old 01-01-2011, 09:04 PM
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Its the idle up adjustment for the A/C, so if you have A/C in your truck and its working fine, there is no reason to adjust it.
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Old 01-01-2011, 10:18 PM
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Originally Posted by myyota
Its the idle up adjustment for the A/C, so if you have A/C in your truck and its working fine, there is no reason to adjust it.
+1


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Old 01-01-2011, 10:33 PM
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Dang it! peer pressure failed!
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Old 01-02-2011, 04:19 AM
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Originally Posted by razed
hmm...
89 4Runner...
a/c idle speed is set by a big, white nylon screw with a spring under it, under the hood, on the side of the intake manifold
... not by a knob under the dash
The box under the dash doesn't set the engine idle speed, it sets the detected engine speed at which the compressor will kick on.
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Old 01-02-2011, 10:31 PM
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Does your ride have an aftermarket alarm?? Could be the alarm sensitivity switch
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