Miata Turbo Forum - Boost cars, acquire cats.

Miata Turbo Forum - Boost cars, acquire cats. (https://www.miataturbo.net/)
-   Engine Performance (https://www.miataturbo.net/engine-performance-56/)
-   -   can i delete my iac? (https://www.miataturbo.net/engine-performance-56/can-i-delete-my-iac-84449/)

RSager11 05-20-2015 10:46 AM

can i delete my iac?
 
I'm running a megasquirt diypnp I can't bring down the idle. So Phil suggests a look as the iac I found that the air valve on the throttle body is stuck open. I think this is my problem. Is their a way to stop the iac from doing this and just use the idle screw to a adjust my idle. Please help

thommorud 05-20-2015 10:54 AM

Are you sure its stuck open or is MS keeping it open. What does Megasquirt show that the Idle duty cycle is?

18psi 05-20-2015 10:58 AM

you want to delete a very important part of the idle control system because you're too cheap/lazy to actually fix the part that's not working right?

....or is this a race car and you don't care about cold starts and idle stability?

Braineack 05-20-2015 10:59 AM

l2t.

RSager11 05-20-2015 11:12 AM

It's not that I'm to cheap I can't get the part right know and I need my car for the weekend. I'm still in the process of ilde tuning. And I with the air valve stuck open it won't go below 2700 rpm. This is tetemporary. Till I can get my hands on the part. Is their any easy way around this for now. So I can move my car?

18psi 05-20-2015 11:14 AM

If it's temporary then sure.

RSager11 05-20-2015 11:51 AM


Originally Posted by 18psi (Post 1233068)
If it's temporary then sure.

Can I just use vise grips to clamp the hose from the intake going to the iat would that be the best way to go about it ?

RSager11 05-20-2015 12:14 PM


Originally Posted by thommorud (Post 1233057)
Are you sure its stuck open or is MS keeping it open. What does Megasquirt show that the Idle duty cycle is?

I think the na miatas are mostly temp controled. But I Sent my tune to autotune who sugested to look at the iat. Where I tested to find the air valve is stuck open. And hopefully causing the high idle around 2700rpm

18psi 05-20-2015 12:19 PM

ait =/= iacv
so you still need to try what he is telling you

Leafy 05-20-2015 12:23 PM

You can probably get it unstuck with an old toothbrush and some carb cleaner.

RSager11 05-20-2015 12:36 PM


Originally Posted by Leafy (Post 1233103)
You can probably get it unstuck with an old toothbrush and some carb cleaner.

Looks like theirs quite a bit of corrosion. But It's with a try.

Braineack 05-20-2015 12:38 PM

how did you find that it was stuck open?
how did you determine is was mechanically stuck open and not just told to stay open?

18psi 05-20-2015 12:42 PM

telepathy

RSager11 05-20-2015 12:55 PM


Originally Posted by Braineack (Post 1233111)
how did you find that it was stuck open?
how did you determine is was mechanically stuck open and not just told to stay open?

I took it off and checked it then heated with a heat gun to see if it moves I'm not just guesing . as all-data says to do. And it does not move

18psi 05-20-2015 01:00 PM


Originally Posted by RSager11 (Post 1233123)
I took it off and checked it then heated with a heat gun to see if it moves I'm not just guesing . as all-data says to do. And it does not move

you heated up the idle air control valve to see if it will move?

:laugh:

Are you confusing it with a thermostat?

RSager11 05-20-2015 01:16 PM


Originally Posted by 18psi (Post 1233127)
you heated up the idle air control valve to see if it will move?

:laugh:

Are you confusing it with a thermostat?

I'm not confused with the thermostat. Though this part works just like a themostat . the part I'm talking about is connected the the intake manifold. With 2 hoses that go to the thermostat. The heat from the antifreeze opens this air valve like a thermostat would. And let's air past the throttle blade. As shown here http://www.justanswer.com/car/2p5e2-remove-clean-replace-idle-air-control-valve.html

18psi 05-20-2015 01:20 PM


Originally Posted by RSager11 (Post 1233134)
I'm not confused with the thermostat. Though this part works just like a themostat . the part I'm talking about is connected the the intake manifold. With 2 hoses that go to the thermostat. The heat from the antifreeze opens this air valve like a thermostat would. And let's air past the throttle blade. As shown here http://www.justanswer.com/car/2p5e2-...rol-valve.html

ummmmm, the one that controls your idle is the one under the TB

RSager11 05-20-2015 01:21 PM

I'm new to tuning . not Car I've been an auto Tec for 6 years professionaly I still have stuff to learn , but I'm not confused. Maybe im confusing when I type or somthing. I'm just looking for away around this temporarily.

RSager11 05-20-2015 01:38 PM

This is a better diagram to see how it would effect idle . https://www.google.com/search?q=does+a+93+miata+have+an+iac%3F&source=lnm s&tbm=isch&sa=X&ei=S8BcVcahEae_sQTFi4HgCg&ved=0CAs Q_AUoAA&biw=360&bih=517#tbm=isch&q=93+miata+iac+ai r+valve&imgrc=sf8UN-qPVJIa1M%253A%3BJh4qkr8taUDb4M%3Bhttp%253A%252F%25 2Fwww.miata.net%252Fgarage%252Fisc_files%252Fimage 002.jpg%3Bhttp%253A%252F%252Fwww.miata.net%252Fgar age%252Fisc.html%3B568%3B524

Braineack 05-20-2015 02:28 PM

he's talking about the stupid air valve on the IM. if that was stuck open your idle would not be stuck at 2700rpm.

go ahead and block it forever.

18psi 05-20-2015 02:30 PM

and then go ahead and follow the steps already outlined in this thread to troubleshoot your REAL idle control valve

ScottyP3821 05-20-2015 04:34 PM

block that shit off and then adjust the screw. Did the 1.6 use this for hot restarts?

RSager11 05-20-2015 05:08 PM

Blocking the hose that went from the intake plumbing to the the iac that's under the throttle body brought down my idle. And I'm able to use the idle screw to a adjust my idle. This is not a permanent fix. But I'm it will got me started.

thommorud 05-20-2015 07:02 PM

So we still don't know what your IAC duty cycle is in Megasquirt.... and if you have even tried tuning it with Megasquirt to fix your idle.

deezums 05-20-2015 07:08 PM


Originally Posted by ScottyP3821 (Post 1233248)
block that shit off and then adjust the screw. Did the 1.6 use this for hot restarts?

There is nothing in the 1.6 ecu for adding idle valve duty on cold starts, if the coolant is cold the thermostat in the air valve will be closed and the idle will be faster. It's action can be completely replaced if you know how to tune.

Mine is still installed with no block off plate and no coolant lines, it does not bother my idle enough for me to bother making a blocking plate.

ryansmoneypit 05-22-2015 10:13 PM

Sounds like my problem, the first time I started my car with Ms and had no clue what I was actually doing.

Find the post on How to tune your idle. I forgot who wrote it. Anyone? Was it hornetball??

Edit: I still don't know what the fuck I'm doing.


All times are GMT -4. The time now is 02:39 AM.


© 2024 MH Sub I, LLC dba Internet Brands