Ah, I think it's only a 500 rpm change for better fuel efficiency (what it was primarilydesigned for in the first place, right?), from what I understand and read up on the board the 2005 has the same mivec settings as a 2006 less a slightly different oil temperature setting for engagement hence the ~500 rpm difference? I would think that the cam and the ecu won't argue with one another over it

But if you do have access to a reflash ha could lower the mivec engagement.

 

It is sad to inform that the ECU did not work...

 

check and re-check your timing, vac lines, all connectors/plugs, grounds, EVERYTHING. could be something as simple as accidentally knocking of a vac line. pull your plugs and have a look now too. you can tell a lot by the way your plugs look. timing could be off causing premature detonation.... you could be getting too much fuel and when it idles down floods out.

 

The shop went over timing multiple times :/

 

I had the same problem about a year ago...granted, my mods are different, but it was only with a drastic temperature/humidity change outside when my car didn't hold an idle.

Keeping in mind, our cars have no mechanical idle adjustment per se, that it's controlled by the ECU...

What I ended up doing, which may or may not help you; disassemble and clean everything that the ECU uses to determine idle. The idle controler valve, on the intake manifold near the throttle, I ended up taking it apart and cleaning/lubing stuff in there. Since then, I've gone through both a MN winter and a crazy hot/humid stretch this summer, and my car's been able to compensate. Maybe give that a whirl...

 

Idle controller valve? I know the shot cleaned the throttle body but im not sure if they knew about the valve... Ill give them a call in morning. If they dont figure it out soon im sendin the car to rrm

 

So i drove the car today. the mechanic had got it to idle with new ecu but then switched them to see it if was ecu and it wouldnt idle again. then swapped ecu to new one again and no idle. I did drive it to try and get it to learn. while driving the car feels great. Full power not hesitation. just wont idle at stand still. Hes takin it to a diff shop to datalog it and see what the deal is. he thinks something to do with the throttle body.

does anyone have a pic of where the idler control valve is on the car?

 

Ok so the mechanic called me. They hooked it up to a laptop and have determined that the throttle body is not getting sufficient voltage under 1200 rpm. He says to swap the throttle body out. So looks like im upgrading to the eclipse v6 body sooner than i thought.

 

The 2006 ECU is completely different because it communicates with the dash and such using CAN. It will absolutely not work with an earlier car. It gets worse too. I've found that sometimes even the same year ECU won't work correctly because some sensors and wiring was changed mid-year. For example the fuel tank pressure sensor changed in '04. I've tuned some NA cars with the Eclipse TB that had the exact problem you described. Once we ripped out the piggyback it idled OK. Depending on which ECU you have there are torque limits and airflow limits that you're going to hit with mods plus the larger TB and that requires a reflash.

-Michael

 

Ok so i installed a new throttle body, re adjusted the throttle to stock, and the car WANTS to idle. It dips to low now and dies. Tried to drive it sent me back to limp mode. Ressetting battery now. Any ideas? its throwing a p2173 code TAC throttle actuator control system-high airflow detected

 

Ok whelp I disconnected the piggy, and viola problems solved :/

 

Lol ALLL that work and money just because you thought the piggy back would be to much work to remove. That sucks but at least you got the car to stay at idle

 

It wasn't that i thought it would be TOO much trouble it just didnt make sense that it would conk out when the timing belt went. Maybe from setting so long disconected from battery it lost its memory?

 

Weird...didn't think something like that would loose it's memory for SITTING for too long

 

Yeah im just waiting to hear back from rob before i try to reinstall the piggy