Yeah should keep the intake manifold looking purdy too

 

Egr delete Ported 4G93 manifold with Evo throttle body
Mine has never had any idle issues and still running a Maf
Possible for the idle speed motor to be bad ?

 

Nope cleaned it thoroughly and swapped mine with RyanCB's Idle control motor, his still idled fine and mine still dipped

 

I keep forgetting to mention this. I noticed that my LTFT Low (idle trim) does not adjust unless I give a little throttle to raise the airflow Hz to probably 35 or so. I recall RS explaining how to raise my idle Hz in ecuflash but I think I misunderstood as I tried adjusting the maf scaling and smoothing lowering and raising but my idle persists at 25Hz, anyone know how to raise this?

 

My map sensor failed and threw the idle way off when the sensor gave bad data. Do you have anything in the logs, if you log everything, any one thing that changes first? would you mind sending me your current rom? I want to pick through it and see if anything is much different than mine, it's so hard to remember what all I've tweaked through the years and why.

 

I have two stock map sensors and both give me the same result :-/. I have doubles of alot of stock parts so over the months I have swapped one at a time with no real change. I am not currently at my tuning computer but I will send it to you. It is probably going to look quite jacked at the moment because I have been swapping values between different roms trying to find a remedy. RS was kind enough to sift through some of my idle logs and other than the very apparent dip in rpms he couldnt see anything in the logs causing the issue. I am happy to send you some idle logs as well Hornstar if you dont mind taking a peek . Have to go fix a Mazda 6 now lol.

 

I decided to revisit the logs and your video against just for good measure today. The only thing that sort of bugs me about the whole deal is the o2 sensor is going all over the place when its idling. I think you should pop the rom into full time open loop and see if the whackness continues it may be a sign of soon to fail o2 sensor or an exhaust leak.

I also noted that your idle timing is pretty high. Not sure if its high enough to induce a miss but something thats easily testable. The only thing not in your log is the EGR switch which i'm not sure can easily be logged.

Just for the sake of curiosity do you happen to own a timing light? If one of your coils is crapping out the timing light should miss a beat right along with it should be a nice visible sign.

 

I have just gotten serious about boostin my car its an 03 lancer ES with about 78k on the motor and body

 

I do own a timing light I will try it . However I also have inline spark checkers that you install between the plug and plug wire and it will blip a light while its running, I have used that and unfortunately the coil didn't miss a beat when it dipped it was still firing to the plug. As far as the timing is concerned, I upped this awhile back to what the stock lancer rom runs at idle in yet another attempt to stop the dips. I think the Tephra rom was originally at 5* so I upped it to the stock lancer 8*.

What can we gather from monitoring the egr switch? Recently I disabled the egr system (left all the components attached though) to see if that had any effect on the idle... it didn't, all I got was an occasional cel saying the egr flow was insufficient so I have since re enabled the egr. As far as the afrs are concerned when it is stable its a healthy 14.7-14.8. As soon as it dips she goes real rich down in the 10's, usually before the afr can stabilize it drops again and the wideband just goes crazy so I think (and hope) that the wacked out afrs are just due to the dipping rpms. I was just thinking today to go back into full open loop at idle just to eliminate one variable until I can get this sorted out.

Another thing though is you said something awhile back about raising the idle hz and I have been unable to accomplish this, for some reason 25 hz is all I get even when I move maf scaling +/-100 points lol. I think you were on to something there however as I have come to realize my LTFT low will not update unless I hold the throttle open slighty just enough to raise the hz a little.

Just about the only consistent thing that I get is that it never ever dips while its cold and also never ever dips when the a/c compressor is spinning.

 

Awesome man you wont be disappointed for sure, just remember they were not built for boost so expect problems

 

Isn't that the truth. Also expect to be upgrading other things as well. (radiator)

 

03 did you ever try my idle timing?

 

Hmm so spark is fine but AFRs go rich when missfire happens. hmm...

The only thing you probably haven't checked is fuel pressure during the event. Does the lancer have that solenoid on it like the evo does between the FPR and the vacuum line? I know its supposed to help on starts by adjusting fuel pressure but i have to wonder if there was a problem with it what would it do?

And I was talking about the load at idle not the hz When load dips beyond a certain rpm/load range the computer seems to think the car is coasting downhill and fuel cuts. I had this happen in early experimentation with speed density.

 

No I haven't, I may take a peek at it and give it a shot, couldn't hurt lol.

No solenoid for us by the fpr, all mechanical there. I do have an adjustable rr fpr, its cheap and I dont dare use it for any driving situations (as I found out) but it does have a pressure gauge on it so I could slap it on for diagnosing purposes... it is fine idling just does not respond very fast while boosting resulting in severe lean spikes.

That makes sense with load not hz, I somehow got that confused. I am going to look back on some logs where I adjusted the maf and watch the idle load.

 

im just curious since my idle used to sound like a miss after that dyno day check over if you recall.