ScoobyDuck

iTrader: (1)

does sound like either the ECU or the ISCV got it's nickers in a twist. thinking that it was in a shut position, when it actually wasnt.
an on/off cured it.

think Andrew might be right - could be a silly bug in that version chipset.
will have to get myself one of these one day..as they're nothing else I can do without butchering my loom!

Steve

[Edited by ScoobyDuck - 11/6/2003 9:10:12 PM]

Triple X

iTrader: (1)

Thats brilliant Bob, i will see if i can get in touch with Andrew regarding the boost prob. Like i say though if i do something more to the car that requires ecu changes i wont hesitate to sort a mapping session with yourself.
Is the boost prob something that i could sort myself (with your guidance of course) using a Link tuning module?

[Edited by Triple X - 11/7/2003 7:48:06 AM]

Triple X

iTrader: (1)

Something strange happened last night and was wondering if someone could tell me if im right with my assumption.
Car in an STi V5 with Link ECU fitted.

Basically i was asked to move my car at work, the car was cold and sometimes struggles on idle which is usual but as the car was still trying to get to a steady idle i turned the ignition off.

Later on i started the car and set of home but noticed that the idle was resting at nearly 2000rpm and would fall back down slowly and the same would happen if i blipped the throttle.

I began thinking wether it was because of the earlier situation where i had turned the ignition off when it was trying to find its idle point. I stopped the car and then restarted it hoping it would clear since it had now found its idle point and as hoped it was fine and has been since.

Is what ive described a normal feature of the ECU?

Tone Loc

iTrader: (1)

Can't say that this has happened to mine (in the very short time i've had a link). Do you have a hand controller or serial/usb link for a laptop? If so what are the hot and cold duty cyles set at now and what is the actual duty cycle showing while 'fast idling'? Can't really think of a resaon why this would happen, i've had to start from cold and then stop a couple of seconds later while moving the car out of the garage (i know i shouldn't ) without any problems???

Tony.

Tone Loc

iTrader: (1)

Just noticed yours is a V5, believe the idle setup is different on these to the pre99 cars due to the stepper motor rather than ISCV....

Tony.

nom

The stepper motor might just be filled with ick - I did a precautionary clean of mine once & the idle was most interesting for a while! Worth a go, seeming it's an easy job?

Triple X

iTrader: (1)

No way of linking to the ECU im afraid. The wierd thing is that this was the only time its ever done it and it went away as soon as i turned the ignition off and restarted it which kinda made me think the ECU had maybe tried to compensate for the ignition being turned off while it was trying to find a steady idle. Could be coincidence mind.

Triple X

iTrader: (1)

No way of linking to the ECU im afraid. The wierd thing is that this was the only time its ever done it and it went away as soon as i turned the ignition off and restarted it which kinda made me think the ECU had maybe tried to compensate for the ignition being turned off while it was trying to find a steady idle. Could be coincidence mind.

SCOOBY TOWERS

iTrader: (7)

Youv'e just said that

TBMeech

John,

Yep it's a Link problem, the latest 10 row chip is nowhere near as bad as the older chips.

Basically what happens is the revs rise and fall from 600-2500 usually until the car has reached a temperature of 80deg.

Did you let the fuel pump prime before you started the car?

A common mistake is to just put keys in and start the car, with the Link you should turn the key to on, then you'll hear the pump whirring, probably for 2-3 seconds, then start the car and it will be fine.

Triple X

iTrader: (1)

Toby yeah i always let the pump prime, its always been a bit lumpy when cold (which is fine) but even when it was fully warm the idle revs would stick at around 2000rpm, it wasnt hunting but was holding at that until i turned the car off and 30secs later turned it back on again then hey presto back to normal!?

Triple X

iTrader: (1)

Oh yes and chris, GET BACK TO WORK!!!!!!!!!!!!!!!!!

Tone Loc

iTrader: (1)

Toby... are you saying that you'd expect the car to idle like that every time until up top operating temp??? My car idles basically as well as the old JECS cold or warm (doesn't quite start as well tho ).

Tony.

SCOOBY TOWERS

iTrader: (7)

This is work !
I see your working as hard as you where when I last visited.
Feet still up on the table ?
4/5 various copies of today's tabloids in the bin ?

Pot & Kettle springs to mind
Chris
P.s. Did you find out the pin info / voltage etc ?

Nezz10

When mine idles quite high I turn the engine off and restart it then let the idle control valve sort itself out (the rising and falling of revs just after start up) once it has done that usually it idles fine.

The only other problem I have is if in traffic and crawling in 1st at about 1.5K/2K rpm then push the clutch in to roll to a stop, the revs dive below 800rpm and it sometimes stalls. I find I have to raise the revs to 3K and let them drop from there, it seems fine then.

Tone Loc

iTrader: (1)

Maybe i've found the sweet spot for the settings as i can't really fault mine (famous last words.... bet it plays up on the way home tonight ).

Tony.

Triple X

iTrader: (1)

Towers, you still wandering around site with that all important bit of paper?
Found out the pin number so can get some readings if you can sort access to the ecu.

My car idles perfect after a couple of mins (apart from last night) but i know what you mean Nezz10 about crawling in traffic, revs sometimes dip to near stalling.

TBMeech

John,

Oooo not sure about that one then

May be worth getting on the Mr Rawle hotline to see what he suggests?

Ton Loc,

No I wasnt suggesting it happened all the time, ie at Idle, but if you were to start the car when cold without priming the fuel pump.

Andy McCord

john, drop me an e-mail when i can try that pump please mate
cheers
Andy

SCOOBY TOWERS

iTrader: (7)

Nope - I've got two pieces now !
R U in work Tomorrow ?

Triple X

iTrader: (1)

Andy, YHM

Towers, yeah im in tommorrow so give us a mail in the morning if you want to look at the Lambda readings.

AndrewC

Bit late to jump in on this one, but isn't this a known problem with the V5 Q-Revision chipset.

On mine (WRX97Q chipset) there is a vague area between the ECU coming off cold enrichment at 70C until it's hot (80+C), I get round this by setting the idle zones a little rich and letting the closed loop control lean it out a little as it heats up, but I digress, your problem is I believe specific to your chipset version.

If you want anything changing or just some logs taking let me know (I'm in preston).

Andrew...

Triple X

iTrader: (1)

Andrew thats great to know (Prestonian myself!) as its quite a long way to Swindon for the odd change here and there!

I do have a problem in that on cold days the car tends to hit its overboost setting of 1.5bar. Its ok up to third gear then if i put my foot down in 4th or 5th and im relatively low down in the rev range it can hit the limit with a resulting jerk of the car. Its ok if i slowly feed the throttle but it still catches me out at times. If throttle added slowly then the boost will steady itself at around 1.35bar and slowly tail off.
Ive spoke to Bob about this and he mentioned that the boost response could be set too errr whats the word "responsive".
I have to hold my hand up and say im not too clued up on ECU's so what would need doing? Simple fix?

Any advise is great!

Triple X

iTrader: (1)

I should add that the car was stone cold and not in the vague area when i was asked to move it at work, and usually when its struggling on cold idle a couple of prolonged blips on the throttle usually settles it but i didnt do that and turned it off when it was struggling.
Then when restarted it was idling at around 2000rpm from cold to fully warm until like i say i turned it off and restarted it again to see if the problem would go away which it did.

Bob Rawle

Its a lot more simple than that, there are several settings that relate to idle, one of those is a vac setting below which the ecu will not control idle, idle also does not start to control til below 1300 rpm and 13 throttle setting (base is 10) so in moving the car and switching off and on the ecu opened the stepper motor twice for cold start, that set the idle outside the 1300 rpm limit and above the vac limit so it simply decided not to control, having warmed itself up a bit turning off then on caused the ecu to reset, as it now idled initially below the limit idle control worked.

Triple X I can fix your overboost problem in about 5 mins, its an adjustment to one maybe two boost control settings. If Andrew would like to get in touch then, provided he does exactly what I tell him and does not touch any other part of the ecu setup, I would be prepared to cooporate in sorting it this way. I would not normally condone a third party adjusting an ecu I had mapped as that then passes responsibility for the ecu settings to that third party. In your case I would make the exception.

cheers

bob

Bob Rawle

If you have the use of a tuning module its straightforward to talk you through it.

bob

Triple X

iTrader: (1)

Might be worth purchasing the tuning module then. Just been looking at the Link manual, i guess the wastegate rpm or wastegate sensitivity are the parameters that need adjusting slightly?