Thread: 5k idle completely stumped

Being an EMS user, although I don't run a turbo, I'll see if I can take a stab at it.

If you were N/A I'd lean towards a gasket leak, however, to suck in enough air to get to 5,000RPM, the air has to be metered, once again, you're running a MAP, so it adds to the unknowns.

If you had an actual leak in the piping, e.g a gasket leak, I'd imagine, you'd know already because you're boosting. Of course, you should be at a vacuum inside the I.M. since the throttle body is shut.

Anyway, the most likely scenario is too much air is getting past your throttle body or your IACV or your AAC. The AAC valve and IACV are 2 separate units, the AAC is under the I.M, the IACV is usually on the far end of the I.M opposite the throttle body.

Here's what I suggest you do.
First off, take off your throttle body. Clean it, inspect it, make sure it shuts completely, check for cracks or missing screws. Second, remove the IACV and AAC units completely, seal the hole with a gasket and plate.

Make your own IACV. Utilize one of the nipples on the I.M, such as the PCV or Brake Booster port. Run a line straight from the boosted side of the throttle body to the vacuum side of the throttle body and literally, put a valve on that line that you can adjust by hand.

My AEM has a very steady idle with no IACV, I just adjust the incoming air and I'm done.

Here's a drawing of my suggestion:

I agree totally with this. I am doing the same thing myself because I am sick of dealing with the idle system

I'm too broke right now though which is why all I have is a clamp on the air reg hose!

got the idle issue worked out THANK GOD! it was actully not a simple ordeal and was complicated but now that i know what was wrong i can see how it was doing it

basicly tps was nOt set on right volts and aem ems wasnt calibrated riht with the tps
the idle% vs idle target table was set high
i pulled the aac valve rebuild it used hondabond for the gasket and plug it in and it WORKED!
i set the tps voltages to the right spec closed and open
adjusted the idle screw on he aac valve
then i adjusted and calibrated the idle% vs idle trget table smoothed out the idle target table and smoothed out the idle% vs target table

basicly now its running at 1200rpm which i am fine with considering i have cams and they dont like much lower than 1krpm, it still needs a little it more fine idle tuning ofthe tables but the aac valve is responding to my carlibrations so that is GREAT

Odd, my EMS is self-adjusting on the TPS, so long as the TPS works, and you set a goal idle, it should automatically figure out what voltage = closed and what voltage = WOT. Not to mention, it utilizes no IACV whatsoever. I make all idle adjustments (rough and fine) by hand. Stock ECU allows you to make the rough adjustment, but all fine adjustments are made by the computer.

yeah mine configues the tps like that also, im really not sure on the tps, and i also dialed inon the fine idle adjustments, i think it was a combo between mechancial and software issue which made it such a weird problem or at least a problem that definitly stumped me