code 14 IACV, crome options
 

Setup is:
d16z6
DSM 390's
Crome basemap
D15 throttle body <-------- Could this be the problem? I thought the only difference was the map sensor mounting point.
IHI turbo


Here's the symtoms:

Before I turboed the car, it ran fine with no CEL, idled fine. Now it idles just fine but when you give it a small amount of partial throttle, it surges some and when you coast off throttle the car bucks because of surging. I'm thinking it's an ECU problem because the car never did this N/A, and now with the chipped ECU it does.

Reason for the d15 throttle body, Had a busted TPS on the old one and I think it was a b18 T-body, got the d15 one with map sensor for cheap. But that shouldn't change ---- right? I mean the map sensor is the only difference between them right?

Here's my basemap:

Re: code 14 IACV, crome options
 

no one has any idea?

Re: code 14 IACV, crome options
 

Is it throwing a code now? If its throwing the 14, your surging idle is most likely the IACV. Have you tried playing with the IACV Duty Cylce slider in crome?
BTW, If you want to use the larger b18 tb, you can switch the tps and calibrate it using a voltmeter.

Re: code 14 IACV, crome options
 

The thing is the idle doesn't surge. It's steady as can be. What it does though is when I give it just a little gas to get it from idle to like 1500 RPMS it surges there. like between 1600 and 1400. No where else. And yes it is throwing a code 14 for the IACV.

Re: code 14 IACV, crome options
 

When I got my code 14, it was because the IACV plug was switched with that little black thingy next to it's plug, I switched them back around and the cel went away

Re: code 14 IACV, crome options
 

I have the same problem! except this happened after I did the Y8 IM swap on my Y7.. wth? let me know if you fixed it. mine was throwing p103 IACV circuit malfunction. But the symptom is same as yours.. car runs fine but it surges exactly at 1.5k and no where else!

Re: code 14 IACV, crome options
 

The low throttle 1500rpm rev limit is the result of the Code 14. Fix that, and it will go away.

Does the Y/Blk wire have 12v @ key on?
Does the other wire have continuity to A9 on the ECU?

If you dont get continuity from either wire to A9, test the other 2wire plugs in the area to see if they do. If you find one that does, thats the IACV plug.

Re: code 14 IACV, crome options
 

i threw a code 14 when the screen on the IACV was dirty. pulled it off, it didn't seem THAT dirty but i carb cleaner sprayed the F out of it. put it back in. pulled the negative terminal of the battery and the backup radio fuse. then start the car and let it idle to FULL warm WITHOUT pressing the accelerator. shut the car off.

that worked for me

-Luke

Re: code 14 IACV, crome options
 

I'm gonna try this.

Re: code 14 IACV, crome options
 

If you follow the steps I listed, you will find the problem.

Re: code 14 IACV, crome options
 

how do you get rid of the 1500 rpm rev limit?

Re: code 14 IACV, crome options
 

I opened myself a helms manual book and went through the trouble shooting. Didn't really help.. I ended up re-wiring the 2 wires from IACV to ECU. Which are blk/yel and black/blue. Tested to see if they had voltage flowing and they did.. I also tried jumping the IACV to see if that was bad.. but it clicked and helms said if it clicked then it's not the IACV.

How do you adjust or rid of this "1500 rpm rev limit"??? chime back it! I'm so frustrated with this problem.

Re: code 14 IACV, crome options
 

ok ok.. I just read from bunch of different forums and supposedly the IACV, when code 14 or P1509 throws the ECU automatically sets the 1500 rpm rev limiter.. :/ weird..

So now the question is.. what could be the problem? did I do something wrong with the wiring? I did the 3 wires to 2 wires conversion due to Y8 IM being in Y7 head.. I repinned the orange wires and left it out cuz I'm not supposed to use that wire and also took the wire out of th ECU side and repinned the blk/blue to appropriate place. Got all these sources for ffsquad.

I'm gonna try this again and see what the problem is.. I tried different ECU as well.. cuz I thought maybe my ECU went bad.

P.S. could it be because my wires are too long from ECU to IACV? cuz it goes from ECU to driver side firewall up to IACV.. is that bad?

Re: code 14 IACV, crome options
 

did you clean out the iacv screen? and clear the ecu like i mentioned?

-Luke

Re: code 14 IACV, crome options
 

yeah.. even changed with 3 other IACV.. and 2 other ECU that was working well.. found out that I'm not supposed to use my stock P2E ECU :1 :S I'm a ------ noob..

could I use a P06 if I had the obd2 - obd1 conversion harness?

Re: code 14 IACV, crome options
 

haha yah the p2e looks for a 3 wire iacv but you've converted to a 2 wire.


wait, wtf. you said your stock p2e ecu. p2e is for a y7 motor. obd2. you're running a full z6 motor, why are you talking about obd2-1 conversion harness?

what chassis is this motor in?

-Luke

Re: code 14 IACV, crome options
 

sorry.. but I thread jacked. I do have the D16Y7 motor Y8 IM. I'm planning on boosting it. :S which is the only reason why I did the manifold swap.

could I just use the P2P ECU (Y8) for now? or is that gonna run funny since it's vtec ecu.

Re: code 14 IACV, crome options
 

oohhh i didn't realize you weren't the original poster. since you plan on boosting, get the obd1-2 conversion harness and a p06 ecu. then you're all set to get it chipped and tuned for boost.

if you've tried 3 different iacv's and 2 ecu's you might have did the wiring wrong.

go to www.jdmuniverse.com and search for the y7 y8 mini me thread written by lillowek. I know he had an image about repinning. im running a boosted y7/y8 right now and when i did my mini-me i followed his writeup. just pay attention to the iacv pinning part and verify your pins. your description sounds right but i forget off the top of my head. verify that when you moved the pin you stuck it in the right spot.

-Luke

Re: code 14 IACV, crome options
 

I think that was the thread I was reading. I know I did the wiring right cuz I ran the p06 last night and it drove fine.. just really shitty though for some reason it was running pig rich. What ECU could I run for now? P2P? or other obd1 ECUs?

Re: code 14 IACV, crome options
 

you have other issues if you run pig rich on a p06. what injectors are in the car? with a p2p ecu you might run lean in lower rpm and rich above the vtec point. this is because the ecu dumps more fuel past vtec, and you might run lean because the p2p is set for 240cc injectors. assuming you are running stock injectors?

-Luke

Re: code 14 IACV, crome options
 

I just heard alot of backfire from my exhaust and I have stock tip too.. so I'm assuming it's running rich..? and when I was running the p06 it idles kinda funky and NO power.. really shitty so I switched it back to p2e.

and yea, im running stock y8 injectors.. cuz i'm using the whole Y8 IM with fuel rail as well.

what do you think? P2P or P06 or P2E and go back to 3 wire.. I would hate to go back to 3 wires though :/

Re: code 14 IACV, crome options
 

thats your problem right there.

stock y8 injectors are 240cc.
stock y7 injectors are 190cc.

put the y7 injectors back in. y7 and y8 fuel rails are identical btw. stay 2wire iacv and run the p06 ecu since you want to go boost soon anyways

-Luke

Re: code 14 IACV, crome options
 

ah!!! lose money this IM swap. :1 I'll try that. hopefully that smoothes it out! Thanks!