Before attemping these adjustments, heed what the FSM says:
1. INITIAL CONDITIONS
(a) Engine at normal operating temperature
(b) Air cleaner installed
(c) All pipes and hoses of air intake system connected
(d) All accessories switched OFF
(e) All vacuum lines properly connected
HINT: All vacuum hoses for the air suction, EGR sys–
tems, etc. should be properly connected.
(f) MFI system wiring connectors fully plugged
(g) Ignition timing set correctly
(h) Transmission in neutral
Engine discussed: 22RE. there are slight variations of the lay out/exact location of each part discussed. All 22RE's operate the same, just some look slightly different.
Factory specifies idle speed is 850 for 4x4 Auto trans and 750 for all others. I find 750 too low, and run closer to 850-875.
This pic shows where to use your standard screw driver. turn this screw to get fast results with your idle. this is called the auxiliary air valve
when the first method does not set you idle low enough, use a 8mm wrench and a tiny allen wrench to adjust the throttle stop. this only has a minimal effect. I am using the screwdriver to point to the set screw
this is the dashpot works like a buffer. so when you snap the throttle closed (let off the pedal suddenly), instead of closing rapidly, it slows the rate down. the dashpot draws a slight amount of air into and exhausts. the dashpot valve which contacts the throttle linkage set screw must contact slightly for this anti snap effect to work. if either the valve or filter is dirty, it can either prevent the anti snap, or raise the idle slightly. particularly if the set screw is adjusted out too far. in this pic, i am holding the filter. you can use WD-40 to clean the valve, and unsnap the filter and clean it to insure proper operation.
