Adaptronic
Sponsored by:
Sponsored by:

Restoring idle control to the OEM ECU

 
Old 12-28-2009, 09:47 AM
  #1  
Senior Member
Thread Starter
iTrader: (19)
 
Join Date: Oct 2007
Location: MoCo, MD
Posts: 703
Total Cats: 0
Default Restoring idle control to the OEM ECU

Over the weekend I swapped back to "stock" in order to pass MD state emissions testing. The Adaptronic ECU is now completely out of the loop, with the stock ECU controlling the idle, which is now infinitely better than anything I've been able to obtain with the Adaptronic.

When I plug the Adaptronic back in, how can I bypass it's idle control? Looking at the FSM, it appears there are just two wires that connect the stock ECU to the IAC, 2M and 2O (or 3M and 3O, can't recall). Is it as simple as putting these back in the loop to the factory ECU or am I missing something?

What's throwing me off is there's just one wire dedicated to IAC control in the Adaptronic literature, which is Aux output 1. If I snip that before it makes its way to the Adaptronic unit, what do I have to connect it to?
pschmidt is offline  
Old 12-28-2009, 09:50 AM
  #2  
Boost Czar
iTrader: (62)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 76,372
Total Cats: 2,294
Default

The oem ecu will need to see all the other signals (cas, ait, clt, etc.) or it wont know what to do and just spit CELs.
Braineack is offline  
Old 12-28-2009, 10:09 AM
  #3  
Ben
Supporting Vendor
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,651
Total Cats: 111
Default

The stock valve gets engine-on +12V from 3M and a pulsed ground at 3O. There would be no reason to interrupt 3M.

As I understand, the adap locks stock AIT and CLT to a fixed value. This probably does not bode well for allowing the stock PCM to control idle.

You may find that opening the mechanical bypass a bit more will do wonders for idle.
__________________
DIYAutoTune.com Tech Support
10AE-T|BEGi S4|MSPNP-Pro EMS|Enthuza Duals|6UL|Etc
Track Rat|2001|VVT|MS3-Pro EMS|Enthuza|Exocet in Progress

Originally Posted by concealer404 View Post
Buy an MSPNP Pro, you'll feel better.
Ben is offline  
Old 12-28-2009, 10:57 AM
  #4  
y8s
2 Props,3 Dildos,& 1 Cat
iTrader: (8)
 
y8s's Avatar
 
Join Date: Jun 2005
Location: Fake Virginia
Posts: 19,179
Total Cats: 509
Default

to idle, he stock ECU needs:

TPS
IAT
CLT
A/C trigger
Power Steering trigger
RPM

and maybe MAF, but I dont think so.
y8s is offline  
Old 12-28-2009, 12:54 PM
  #5  
Senior Member
 
Join Date: Nov 2007
Location: somewhere in NoVA
Posts: 533
Total Cats: -1
Default

Pat,

What fuel injectors are you running? Can the factory ECU handle idling 600cc or 550cc injectors?

If it can... then I would be curious to do the same thing... I had a horrid time in traffic this weekend with my idle issues...

Cheers,
[email protected]
Prospero is offline  
Old 12-28-2009, 01:40 PM
  #6  
Senior Member
iTrader: (4)
 
Join Date: Nov 2009
Location: Toronto, ON
Posts: 1,447
Total Cats: 6
Default

I doubt the oem ECU can handle 600cc injectors. I wish I could leave cranking and idle to the factory ecu.
dgmorr is offline  
Old 12-28-2009, 03:38 PM
  #7  
Senior Member
Thread Starter
iTrader: (19)
 
Join Date: Oct 2007
Location: MoCo, MD
Posts: 703
Total Cats: 0
Default

Thanks guys, it seemed too easy.

Matt, I'm back on stock injectors for the week in order to get through VEIP.

When I installed Xede a few years back I tried running the 550ccs on the stock ecu; no luck.
pschmidt is offline  
Old 12-29-2009, 04:14 PM
  #8  
Senior Member
 
Join Date: Dec 2004
Location: Brisbane, Australia
Posts: 1,276
Total Cats: 34
Default

Does anyone here have their idle/cold start sorted so they can honestly say its like stock again?
timk is offline  
Old 12-29-2009, 05:45 PM
  #9  
Senior Member
iTrader: (4)
 
Join Date: Nov 2009
Location: Toronto, ON
Posts: 1,447
Total Cats: 6
Default

y8s says his cranks and catches quickly. I'm definitely envious of that. Still waiting on my 600cc injectors and other bits so I can fully use some of the better maps that have been posted.
dgmorr is offline  
Old 12-29-2009, 09:43 PM
  #10  
Junior Member
 
Join Date: Jul 2007
Location: Mundelein, IL
Posts: 59
Total Cats: 0
Default

Not like stock yet, but getting closer...

hot starts (like just recently shut down), almost like stock
warm starts, sometimes it cranks quite a bit, but I have to turn the key no more than twice to get it to catch anymore.
cold starts, same as warm but a little easier, but I've got my crank fuel set to 142 @5* C as of today... Does that sound reasonable? Does it really need that much fuel when it gets cold? I'm on stock injectors...

Warm idle, nice and steady at 900-950... Headlights or other elec. load makes the idle drop to about 600 then slowly recover back to 900 or so. Gotta work on that. Very slight hunting.
Cold idle, right after start, it idles very low like 500 or so if I don't help it, then wakes up and idles perfectly after about 5 seconds. I can start it and get it to idle without touching the gas down to 0C so far.

I'm not sure what I'm doing wrong with enrichments for the cold start/idle that don't let the rpm's jump up faster...
micagreenmachine is offline  
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
bigmackloud
Miata parts for sale/trade
16
03-03-2019 03:41 PM
nbdooey
Miata parts for sale/trade
9
08-30-2017 09:50 PM
Quinn
Cars for sale/trade
6
10-23-2016 07:58 AM
The Gleas
MEGAsquirt
3
10-01-2015 09:30 AM


Thread Tools
Search this Thread
Quick Reply: Restoring idle control to the OEM ECU


Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.