Hey Buds,

MODEL: 94 D21, 4CLY, 200K, AUTO
ISSUE: Erratic Idle

I've got an issue WITH my Truck...can't see to get the idle to stay consistent (FLUXUATES up and down, even while driving i can feel it)

There seems to be 3 replaceable parts, in the Throttle body.

See Diagram (s)




I've replaced MAF sensor (B), However, i have yet to change Part A and C.

Part A seems to be some kinda spring with a Valve inside of it (it might be Idle Air Control Valve)???

Can anyone tell me what these are...and if they are worth replacing?

THANKS very Much~

ps. i recently changed, plugs, wires, rotor and cap and fuel injectors.

Fuel Injectors made a difference, but did not affect fluctuating idle

You can download the complete repair manual for your D21 @ Cardiagn.com.Youll have to select manufacturer & model. Can't remember if mine came up or had to scroll to bottom of page and select manufacturer and scroll through manuals to find the D21 but it's there. I'd for some reason you can't pull it up I have the complete manual. I just put a D21 in a 2000 Frontier. This site has almost every model car and year.