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hi fellows,

i got randomly rough idle with grey/black smoke when idle in auto "D", nearly stall, maybe will stall later. driving is ok. when open bonnet, i found the plug is disconnect from solenoid between throttle and plenum. what's that for? does it cause the problem when idle?

thanks.

post-137368-0-52909200-1462669341_thumb.jpg

Edited by YangLIU

No idea, why would you leave it unplugged? At a guess it could, as the solenoid is likely open at idle.

ah...forgot to connect it back when do some mod.... ;););)

btw, i mean the power plug is disconnect, so i assume there is no air leak causing rough idle problem even though the solenoid does not have power.

Edited by YangLIU

Looks like the aac to control ya auxiliary air control. Makes sense as I've heard it might give you a rough idle. Please confirm ppls

i re-connected the power plug for that aac, so far no rough idle. but there was only randomly rough idle before, so i can't make sure if rough idle really get sorted.

Edited by YangLIU

It's not aac, iac or any other idle valve, it is a purge solenoid for the fuel tank. As you are stuffing around with the amount of air getting into the plenum it may help anyway, but I wouldn't touch it.

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