austinmacry

Does anyone know where the idler screw is? And which was to turn it to lower the idle? Also what is the proper idling rpm is for a 91 4runner manual 3VZE?

abecedarian

Screw- turn in (clockwise) to lower idle, turn out (counter-clockwise) to raise idle:
(Screw is just barely right of center of image)



850 rpm's for idle speed.

austinmacry

awesome thats perfect thank you!

abecedarian

make sure you adjust your timing when you change your idle.

austinmacry

Im adjusting the idle because I just got done putting new plugs/wires and re-timing the distributor and the rpm is sitting at 1700. So your confusing me on the timing thing?

abecedarian

Timing is set at a particular idle speed. Changing the idle speed can change timing.
Both are rather intimately related- changing one affects the other.
So you have to set both: timing @ 10BTDC with idle @ 850.
Make sense?

austinmacry

Okay I understand what your saying except I dont know what 10btdc means.

abecedarian

ignition timing set to 10 degrees before top dead center (10BTDC)

austinmacry

Got, thats all pretty easy stuff thanks!

abecedarian

yep. set the idle, jumper the diagnostic plug and check / set timing, then set idle, and repeat until you have the idle and timing set.

ethemm

What will come up when checking the diagnostic?

82toyotamike

Does any one know why my idler screw keeps comeing unscrewd? And how i can make it stop?

TNRabbit

It needs a new o-ring. Dealer or if you have the old one you can take it in to any parts store & get a replacement.

ethemm

never mind i understand now