Hey guys,

I have been problem solving my idle issue for a few months now and i had a thought last night.

If i remove the battry for the required amount of time (i think its 2 hours) the ecu will reset and you have to let the car idle for abit and it will sort itself out, will this adjust my idle? Mal played with the screw and opened it up, its fine when in neutral but when it gets into D it will drop to around 500 and the lights go dim and its REAL annoying.

Or will disconecting the battery and the transmission needing to be eased in so it knows when to shift be too much trouble?

any help is greatly appreciated.

presti

Hey guys,

I have been problem solving my idle issue for a few months now and i had a thought last night.

If i remove the battry for the required amount of time (i think its 2 hours) the ecu will reset and you have to let the car idle for abit and it will sort itself out, will this adjust my idle? Mal played with the screw and opened it up, its fine when in neutral but when it gets into D it will drop to around 500 and the lights go dim and its REAL annoying.

Or will disconecting the battery and the transmission needing to be eased in so it knows when to shift be too much trouble?

any help is greatly appreciated.

presti

from what i remember,turning the idle screw on the manifold/TB alone will work for a short time ,then the ecu,stepper motor will pull it back to previous setting,only way to do it properly is to have the MUT tool connected to zero the ICM and then adjust the base idle,then it will hold its setting (lower or higher idle)

from what i remember,turning the idle screw on the manifold/TB alone will work for a short time ,then the ecu,stepper motor will pull it back to previous setting,only way to do it properly is to have the MUT tool connected to zero the ICM and then adjust the base idle,then it will hold its setting (lower or higher idle)


where do you go to get this done? or how should i say?

where do you go to get this done? or how should i say?

mitsubishi service department,or anyone with a MUTT tool and appropriate service manual for info on how to perform the adjustment

alright thanks for that.

I dont know, but just a thought, can you change it by moving the tps? just a thought.

I dont know, but just a thought, can you change it by moving the tps? just a thought.

i've removed and changed my ISC a few times but i was told that the TPS wouldn't be any different

ahhh, ok. Because i noticed that they have a twist adjustment.

if you manual adjust it , it recorects itself?

ahhh, ok. Because i noticed that they have a twist adjustment.

ah
i might have a look, where is it located in the engine? near the TB?

if you manual adjust it , it recorects itself?

yeah i noticed that, its like the computer is too smart and just goes back to its normal settings. its annoying..

When i went from auto to manual i had to raise the idle speed with the screw on the tb. It never corrected itself, always stayed where i had set it.

i had Mal change it and it just went back to the same 500 on idle, very rough and drops to around 250-300 when i come to a stop. i thought my ECU might need a reflash or to be reset so it finds the factory spot again. Does anyone think i should?

it is the circulat plug on the radiator side of the tb, it has 2 screws holding it in, and both have slides that allow adjust ment, kinda looks like an adjustble dizzy cap, by small. it alo ga wires runnig into it. Just remember where it is when you start, and put it back there if it doesnt work properly. mayby you need a new one, but i am just putting it out there, i am not saying that it is the problem.

also, like your saying, it doesnt hurt just to unplug the battery for 5-10 mins just to reset the computer.

I would think, that a ECU reset might be called for.

Since i had my ECU power DCd for several hours last week (its come good now thankfully), the engine now idles at a slighly lower RPM than before the reset happened.

The downside of course to ECU Resetting, is the learning to idle again... and if Auto, having to have the transmission retaught on how to do its thing.

Maybe the ECU wants to be reset, after Mal adjusted the idle screw - this way the ECU will pick this point of slightly raised RPM as its new base point perhaps?
Just a couple of thoughts :)

Had the same problem after disconnecting my battery, the idle was very low. I tried the transmission relearning process thinking that would help but it didnt.
So I disconnected the battery and tried again and still no luck. But after a day it seemed to fix itself.

what else does keeping the battery off hours do? remap fuel and oxygen mixtures and stuff?

what else does keeping the battery off hours do? remap fuel and oxygen mixtures and stuff?

It will also clear any fault codes logged in the ECU,
EG - if your O2 sensor was sending wrong signals, it will log a code.
even though you have changed the O2 sensor, you must still clear the code tell the engine everything is again all good. resetting the codes, can be done with the MUT2 scanner, or by DCing the batter.

The ecu, will alays have a base map to work with (unless you get it wiped for some reason)
The ecu will learn on its own, what works best to keep the engine idling / running - this is most likely why Magna engines stall a lot on a reconnection of the battery after ECU reset - the ECU is still adjusting its own maps, to keep the engine running (and trans shifting etc etc)
Automotive world acroding to me anyway - please feel free to correct me if im wrong :)

It will also clear any fault codes logged in the ECU,
EG - if your O2 sensor was sending wrong signals, it will log a code.
even though you have changed the O2 sensor, you must still clear the code tell the engine everything is again all good. resetting the codes, can be done with the MUT2 scanner, or by DCing the batter.

The ecu, will alays have a base map to work with (unless you get it wiped for some reason)
The ecu will learn on its own, what works best to keep the engine idling / running - this is most likely why Magna engines stall a lot on a reconnection of the battery after ECU reset - the ECU is still adjusting its own maps, to keep the engine running (and trans shifting etc etc)
Automotive world acroding to me anyway - please feel free to correct me if im wrong :)


thanks man that does make alot of sense.

ill disconnect the battery, but for how long do you rekon? im going to disconnect, rotate tires on the car and check the ECU isn't damp :) so maybe an hour or more?

i had Mal change it and it just went back to the same 500 on idle, very rough and drops to around 250-300 when i come to a stop. i thought my ECU might need a reflash or to be reset so it finds the factory spot again. Does anyone think i should?

Might be worth cleaning your PCV valve too. I know these things have an effect on idle.

Might be worth cleaning your PCV valve too. I know these things have an effect on idle.

if thats the valve that allows air when the butterfly valve is shut i've done that, i removed my throttle body and cleaned it all up very well ( i hope haha)

currently have the battery disconnected and has been for around 45mins. will reconnect in around half an hour or so :)

The PCV valve goes from the rocker cover to the air intake pipe behind the throttle body. When you shake it you should be able to hear a ball bouncing around inside it, if you can't its dirty and should be cleaned or replaced. You can clean it out with carby cleaner.

The PCV valve goes from the rocker cover to the air intake pipe behind the throttle body. When you shake it you should be able to hear a ball bouncing around inside it, if you can't its dirty and should be cleaned or replaced. You can clean it out with carby cleaner.


ill go have a look as the idle was great for about 10 mins and then it started to play up again.

when i first started the car after the while the idle was real high then i played with teh screw and it was sitting perfect, and yeah started to drop again.

http://i86.photobucket.com/albums/k111/presti_01/IMGP0480.jpg

Tobed0g (http://www.aussiemagna.com/forums/member.php?u=21891) can you show me which pipe the PCV valve is?

number one or two? im unsure which one it is.

Thanks,
presti

I can't see the ends of the hoses onto the engine. One of the hoses will go straight onto the cover and the other one will go into a little cylinder or similar. The little cylinder/bolt is the PCV valve.

number one goes into like a little nipple that extends from the TB itself, the 2nd goes into the intake of the tb (the plastic black thing)

ah its all so confusing :(

I meant on the engine end...

I meant on the engine end...

oh okay well i cant find it, i guess ill try to search for an image.

thanks

while looking into the engine bay,look to your left were the rocker cover changes direction, (to the left and below the oil filler cap)you will see a pipe there,it is connected on to the valve whick fits into a rubber grommet in the rocker cover

http://i694.photobucket.com/albums/vv302/robssei/IMG_3914-1.jpg

ah shiiit, i was looking at the throttle body haha thanks guys! appreciate it :)