Restoring idle control to the OEM ECU
#1
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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?
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?
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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.
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.
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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.
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.
#10
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...
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...
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