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?

 

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.

 

awesome thats perfect thank you!

 

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

 

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?

 

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?

 

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

 

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

 

Got, thats all pretty easy stuff thanks!

 

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.

 

What will come up when checking the diagnostic?

 

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

 

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.

 

never mind i understand now