Hey,
Anyone running w/o the stock idle air control valve? I let my VQ30 idle for a while the other night w/ the idle air control valve tube plugged. I cracked the throttle valve open w/ the screw and it idled okay.

I'd like to hear from someone that is running this way on a daily driver. Is there any drivability issues associated w/ this?

I've been bitten w/ the cut-out-every-wire-that-isn't-necessary bug and so the stock IACV system is next on my list. That bug goes along w/ the hide-every-wire-you-can bug, so watch out.


Thanks,
allen

 

I've been running without the IACV ever since switching to the 00VI last December. I've been meaning to make myself an IACV remote mounting plate, but every time I do I end up selling it to someone else instead.

I control idle speed with the throttle plate adjustment screw on my Pathfinder throttle body. The idle speed is a bit too low on cold mornings until the engine warms up a bit (since the PF TB doesn't have the cold start fast idle cam like the A32 TB), but other than that I haven't had any problems running this way.

 

Does running without IACV throw a code?

 

Yes it throws a CEL, 0205...

Im running without an IACV too.....

StephenMax, does your idle bounce around if u try to hold rev it to 1300 or so like the IACV would do to warm up the car faster? It jumps(like a misfire) up and down about 100rpm or 200rpm while I hold the throttle, then once the car reaches the cold line the idle shoots up about 500rpm and holds steady.

 

I'm also running no IACV



The ONLY issue I can think of without running an IACV, is when you are coasting and still in a gear, the TB at this point is closed, but the engine still needs to breathe. If and only if the IACV opens at this point, running without an IACV would sort of cause the engine to "choke", but since you are in gear, that is what keeps the engine alive.

 

if you adjusted the TB adjuster screw for idle the TB will never close fully to choke it

 

Pretend you are at 3500 rpm, 2nd gear, you lay off, TB closes, @ 3500 the engine needs more air to breathe than at idle (which your TB is set for). The engine is still breathing in air, but in a sense, not enough.

It's sort of like breathing through one straw instead of multiple straws. Much more difficult.

 

ah, ok I understand your point now

 

Yeah, there's a bit of unsteadiness first startup of the day. It settles down after a little while.

I don't get any codes, but I've got all the idle air control solenoids plugged into their connectors.

 

So what is the concern? You have the throttle closed for a reason, i.e. decelerating.

 

It doesn't matter how much air the engine gets when you're decelerating regardless of RPM because the ECU does a fuel cut upon deceleration. No fuel = no combustion = no need for air.

 

Really? I tried that and the ECU still throws me a 0205 code for IACV

 

I stand corrected.
My sister's car also throws a code even with the IACV plugged in.