Learning View Snapshots \ Discussions

[KiDo_Tuning]

Hey dle, have you checked the vac hose on your MAP sensor? (just left of the alternator when you remove the engine cover)

I've had it happen before when the dealership left it off, horrible erratic idle.

My MY05GT developed a bad idle again, after resetting ECU I checked and it looked like it was still on. Did LV and I'm getting +15 under AF learning #1 at idle. BOV vacuum suction is nice and strong.

Took a closer look, and the hose fell off at the other end! not the MAP end.

Going to reset and take for another drive soon.

pips06 had same issue in Canberra, MAP sensor hose off... Lucky I had zipties and a screwdriver!

[dle]

I logged some values (on idle) and compared them to values indicated in diagnostic section in service manual and they all seem to be within range. Even the A/F learning 1 says +/-15

Still have very intermittent misfire though. Any other ideas? Hopefully I won't need to replace injectors? Any chance it's not just a faulty o2 sensor that's on the way out? I don't have any CELs or anything

[maj]

Hey dle, have you checked the vac hose on your MAP sensor? (just left of the alternator when you remove the engine cover)

I've had it happen before when the dealership left it off, horrible erratic idle.

My MY05GT developed a bad idle again, after resetting ECU I checked and it looked like it was still on. Did LV and I'm getting +15 under AF learning #1 at idle. BOV vacuum suction is nice and strong.

Took a closer look, and the hose fell off at the other end! not the MAP end.

Going to reset and take for another drive soon.

pips06 had same issue in Canberra, MAP sensor hose off... Lucky I had zipties and a screwdriver!

I'm going to have a chat with my dealer, mine had torn on the intake manifold side and obviously quite brittle, which doesnt surprise me since that's where they spray in UEC.
For an 8 year old car having that vac hose removed every 4 months, I'm surprised they don't occasionally bother replacing it every once in a while, it's like 10cm max!

Anyway I've reset ECU and let it idle for a while before driving around. Now seeing +2 on idle, then 0, -1 and -3.8 for the others. Much better.
IAM is at 0.875 because I haven't had a traffic free road for long enough to do the fast relearn trick. I expect by the drive home this arvo it should be back to 1.000.
Idle is back to being rock solid, helps that I cleaned out the MAF too.

I initially thought mine was front O2 related, but I couldn't see any symptoms that would be suggesting that since my erratic idle came and went every so often, no codes either. On RomRaider watching AF learning #1 I would constantly see it going between -15 and +15 very quickly, obviously it was running too rich and causing it to almost stall (sometimes it actually would stall), then immediately tried to compensate.

[Hotwire]

After a week, variety of driving with plenty of short runs to/from school by the wife also (lots of cold start/idling) and still looking good

[BlackSTI]

My first learning view...

I only just got the car back yesterday from getting the head gaskets redone, so not sure if the ECU was reset or not. I have reset this morning and will have a look after a week or so (If that's whats recommended).

Does anyone see anything of interest? Looks like its running a bit rich in the higher air flows?

[maj]

It's actually running leaner, which is normal, negative values means it's taking away fuel.

From my rather uneducated eye, everything is looking good though.

[bass_straitener]

It's actually running leaner, which is normal, negative values means it's taking away fuel.

From my rather uneducated eye, everything is looking good though.

Correct it is running a little leaner in the OL fueling table. Whilst I'd say that's perfectly fine for a stock tune which runs a lot richer than a tuned car, and can cope with, and is in fact designed that way to cater for a dirty air filter etc.

A tuned car such as yours should ideally be set at optimal level during the tuning process and therefore shouldn't have the OL fueling influenced by a CL management setting.

A quick fix of the tune to stop OL fueling being affected is required via the AF correction ranges being adjusted.

This applies only to your car still running the ChipTorque tune.

If you've reverted back to the stock tune, you're completely fine.

[BlackSTI]

It's actually running leaner, which is normal, negative values means it's taking away fuel.

From my rather uneducated eye, everything is looking good though.

Correct it is running a little leaner in the OL fueling table. Whilst I'd say that's perfectly fine for a stock tune which runs a lot richer than a tuned car, and can cope with, and is in fact designed that way to cater for a dirty air filter etc.

A tuned car such as yours should ideally be set at optimal level during the tuning process and therefore shouldn't have the OL fueling influenced by a CL management setting.

A quick fix of the tune to stop OL fueling being affected is required via the AF correction ranges being adjusted.

This applies only to your car still running the ChipTorque tune.

If you've reverted back to the stock tune, you're completely fine.

Thanks bass and maj.

My car still is running a ChipTorque tune, but from what I have read / conclusions I have come to, I can not modify this tune. When I try and read the tune off the ECU it disconnects at the same point that (locked) EcuTec tunes do. Happy for anyone to prove me wrong though

I do have the option to restore the stock tune and unlock it with the ezyflash pro hand held box.

So I see a few options, leave it on the tune it is (not sure if that's advisable).
Revert to stock and leave it there.
Revert to stock and get a kido tune or similar.

For the time being until I have time to organise another tune (I would no way consider trying tuning yet), should I revert to stock (only modifications are dump/exhaust)?

[KiDo_Tuning]

You can add tunes to the EzyFlash unit Done about 30 of them NIK027 is in Toowoomba with a Forester XT and we just loaded a new tune so he could test them back to back

[BlackSTI]

You can add tunes to the EzyFlash unit Done about 30 of them NIK027 is in Toowoomba and we just loaded a new tune so he could test them back to back

Whoa what... I thought you had to pay for the software to do that?

Can you modify existing tunes on there?

[KiDo_Tuning]

You can add tunes to the EzyFlash unit Done about 30 of them NIK027 is in Toowoomba and we just loaded a new tune so he could test them back to back

Whoa what... I thought you had to pay for the software to do that?

Can you modify existing tunes on there?

Cannot modify existing tunes, as they are locked to the device BUT you can add extra slots. There is 20 tunes per device available. So stock in Slot 1, then the various tunes Chiptorque load and then load in a new tune to the device etc.

There 'may' also be other ways around it though.

[BlackSTI]

After a few days of being back on the stock tune

[dr20t]

D range AFcorrection is not good

Leaning out in closed loop at mid range which is the most dangerous part to lean out at (as this is generaly peak torque area) and I would say this is partially causing the knock retard you're seeing of 0.70

[bass_straitener]

On the stock tune, nothing to worry about as its quite fat from factory. A slight correction like that is perfectly normal.

Also the correction is during CL which is perfectly managed by by the ECU in its attempt to reach stoich.

Peak torque on stock cams is at 4400rpm so no real concern either.

If this was a custom tune, then yes AF correction range D should be 0 as it also has influence over the OL fueling table which should have been set perfectly on a dyno or via sufficient logging,

[dr20t]

Yeah you're probably right Bruce - didnt actually think of stock having headroom (was looking at it as if its my own - I wouldn't be happy with 6% correction in D range, although standard D range is 40g/s + and mine is 80.

And yes also agree about open loop being ok but I still wouldn't like to risk correction in higher airflow ranges with the ej255 which is known to be susceptible to hg / ringland problems once any lean conditions or knock are detected. Especially lately...

Agree though that theres no need for massive concern

Mick