surging through the rev range particularly cold

[05gtwagonman]

Just had a rather interesting morning driving around with the state(qld) service manager for Subaru. We had a computer monitoring real time and logging all of the information from the ECU. He reset the ECU about half way through the drive. In my case (everyone is likely to be different)
The lumpyness through the boost range is totally down to ecu recalibrations. The ecu was retarding by as much as 6 deg. at times under hard boost! He was saying that this fluctuation of the timing ( to ensure there is no pre detonation) is what will make things a little lumpy at times. It wouold seem that the fuel quality is the stongest influence across this. I only run 98, but there can be stong differences in the quality of each tank adn the ecu takes a little time to readujust back to optimum after a bad tank. (really important not to be stupid, or duped by shonky operators into putting 91 in there, it can take months if you don't reset apparently). Anyway, it would appear that I am just being a little too picky on this front. It refused to do the bake pedal issue, or the off boost pig root witht the computer attached, so we are no further ahead with those...
Thought htis might have been of interest tho.

[Spec B Wgn]

i still think the 02 sensor is stuffed.. but anyway

what was your advance multiplier at ??? these drop off if you have a bad fuel scenario.

peak target should be about 16.. i bet yours was about 6 or 8 ??

when he reset your ECU did you give it a good boot full to get the AM up ??

otherwise you are back to square 1 again

[05gtwagonman]

ok, you know a lot more about this sh#t than I do... didn't hear anything about advance multipliers (good tools ) I'm somewhat in the hands of the gods with ECU stuff.
Genuine question- what have you experienced that is giving you all this information. I keep asking the State guy about the o2 and he feels really certain it has very little if not nothing to do with... No critisim from me, just trying to get some ammo as to why you would know when I talk to him next...
At any rate, despite the feeling that I was about to be written off as a fool, they ae getting another set of diagnostics in to set me up with a set in the car for the week, with a trigger, that will save the last ten minutes of data that it has recorded. So I can set it off whenever I experience any of the issues that we are chasing. This surely will fnd the issue.
BTW did you get an indication as to how expensive the O2 sensor was, is it the cost that is stopping them wanting to replace it JIC?
Thanks for the help...

[Spec B Wgn]

the advance multiplier basically is a value grade on how well your car is running..

16 is the target figure to strive for... bad fuel or pussy footing around town can see this drop off....

I've seen 8 on my STI .... reset the ECU ... and a spirited right foot through the rev range should see this get up into the 14's or higher

A stuffed 02 sensor will see surging, hesitation etc etc

try these guys for an 02 sensor ... Subaru will charge you over $350


www.petroject.com.au

[BlackGT]

I'm getting this problem and has become more obvious the last few months. Will be getting tune-up on Tuesday and will get MRT on the case. If it's a faulty O2 sensor then that's annoying since I already have changed that part under warranty!

[05gtwagonman]

Let me know what happens.

I have been looking very closely at the MRT kit options, and although I had gotten to the point that I believed that MRT was probably one of the few outfits that was cautious and senslible about their modifications, I have noticed a few disgruntled punters about. Is it that they can't please all people all the time, or are they not as good as I thought?

Anyways let us all know how you go...

[Spec B Wgn]

Let me know what happens.

I have been looking very closely at the MRT kit options, and although I had gotten to the point that I believed that MRT was probably one of the few outfits that was cautious and senslible about their modifications, I have noticed a few disgruntled punters about. Is it that they can't please all people all the time, or are they not as good as I thought?

Anyways let us all know how you go...

I use MRT stuff & Kits but installed /serviced by S&J (MRT agents) i cant complain with their service.. everyone has a bad story to tell.. i go by personal experience rather then hear sake on the internet.

[BlackGT]

So I dropped my car off to MRT for my 62500 service last week and mentioned the above problems. After getting my car back the problem was no longer limited to when the engine was cold (ie first 2 minutes after starting car) it now did it throughout the gear range and when the car was warm.

So I've taken it back to MRT for further study. Am told I will have the the car after a few days

I can't recall a time where I havn't had to take the car back to them for something wrong

[Spec B Wgn]

if this doesnt get sorted out by MRT ...

pm me

[05gtwagonman]

Blackgt- very interesting to have two cars doing something so similar at the same time...
My problem seems to be that if it is bad cold, it is better hot. But if they reset the ecu/ idle somthing or other or anything that helps the cold prob. then the hot gets worse. It is a balancing act...
I think there is a good chance that the outcome for one will assist the other so please stay in touch.
On my front, last week i ran with the diagnostic computer for three days logging data. I am still waiting to hear back from Subaru, but I think that this is the best chance we have had of getting to the botom of this issue..
All the best, let me know...

[Spec B Wgn]

On my front, last week i ran with the diagnostic computer for three days logging data. I am still waiting to hear back from Subaru, but I think that this is the best chance we have had of getting to the botom of this issue..

they dont know what the issue is otherwise they would have told you...
3 days of data logging ....why

the problem should show up straight away on the log...

Dont hold your breath waiting..cos they are scratching their heads trying to think of another excuse for you.

i presume you havent changed your 02 sensor yet ???

[05gtwagonman]

nope, can't convince subi that they need to look at changing it.
If they get nothing worthy looking through the log, I will get to the very high pitched insistance stage...
At the moment I am happy that they are still treating me with respect, I think Holden or Ford ETC would have told me to F*^k off before now, as it has been rather ellusive and refused to replicate the problem with the state guy on board...
Have you got any further ammo I can use to convince them it is the o2 sensor?
I was thinking that if the log result was inconclusive then I would suggest that with no better alternative, put the new O2 in for a day or two and take it back out if that's not it...

[BlackGT]

if this doesnt get sorted out by MRT ...

pm me

I will thanks...btw I love that profile pic

[BlackGT]

Blackgt- very interesting to have two cars doing something so similar at the same time...
My problem seems to be that if it is bad cold, it is better hot. But if they reset the ecu/ idle somthing or other or anything that helps the cold prob. then the hot gets worse. It is a balancing act...
I think there is a good chance that the outcome for one will assist the other so please stay in touch.
On my front, last week i ran with the diagnostic computer for three days logging data. I am still waiting to hear back from Subaru, but I think that this is the best chance we have had of getting to the botom of this issue..
All the best, let me know...

I think I'm kind of lucky having someone else having a similar problem so I will definately like to share knowledge on this problem and hopefully get everyone over the line.

For me it was only when it was cold but now I can feel it whenever. That is awesome that you had the diagnostic computer. If you get some feedback I would love to give this to MRT.

This sucks!

[Spec B Wgn]

Blackgt- very interesting to have two cars doing something so similar at the same time...
My problem seems to be that if it is bad cold, it is better hot. But if they reset the ecu/ idle somthing or other or anything that helps the cold prob. then the hot gets worse. It is a balancing act...
I think there is a good chance that the outcome for one will assist the other so please stay in touch.
On my front, last week i ran with the diagnostic computer for three days logging data. I am still waiting to hear back from Subaru, but I think that this is the best chance we have had of getting to the botom of this issue..
All the best, let me know...

I think I'm kind of lucky having someone else having a similar problem so I will definately like to share knowledge on this problem and hopefully get everyone over the line.

For me it was only when it was cold but now I can feel it whenever. That is awesome that you had the diagnostic computer. If you get some feedback I would love to give this to MRT.

This sucks!

mate MRT will log yours as well... the lap top plugs into the OBD port under the dash ... im confident they will fix this for you.