Chasing hesitation issue/ please review logs - N54Tech.com

Rube23 · 2019-02-02 21_08_41.csv (8.6 KB, 68 views)

Hey everyone,

I recently purchased a brand new JB4 and installed it and noted hesitation issues when rolling into throttle. So to verify if it was the JB4 causing any issue, i selected map 0 and still seeing the hesitation. No check engine lights ever popped up and using the JB4 to check for any codes, i didn't have any. Car is a stock 07 335i with only an upgraded ER charge pipe.
So the other night i did a log (Map 0) and managed to capture the hesitation as i rolled into the throttle. I'm nowhere near an expert so can someone please check the log and see if anything jumps out as to what the issue could be?
One thing i noticed is I'm seeing more than stock boost levels, the boost looks to be all over the place in the 3400-3800 range, same with ign1 and trims in the same area.

Thanks!
Rube

Rube23 · 02-05-2019, 12:48 PM

just some more info on the car. 109k miles, the previous owner gave me some BNW invoices which showed the turbos were replaced at 78k miles. no wastegate rattle
Bosch plugs, delphi coils and new index 12 injectors (i coded them as well) were installed by me about 6k miles ago, when i first got the car.

codesx · 02-05-2019, 04:00 PM

I believe I see the 'blip' on line 24 and 25, looking at the "Throttle". Very brief.
The "Pedal" doesn't show any release.

AFR jumps immediately prior. We're talking only 200ms.
The blip is also reflected in the RPM.

So, Pedal steady, Throttle drops from 48 to 15, then spikes to 68.
Ignition drops from 15 to 1.5. Expected.

Basically, everything responds to corroborate your observed symptom.
Hard to say which is the initiating factor is based on the log. The AFR is the only field that precedes the Throttle blip.

I can't see traction control being related, as you are barely on it.

---

Well, looking at your boost, you are WAY OVER... I should have started there.
You have to figure out why your target is 1.8 and you are pushing 12.9 PSI. When target is 8, you are over 13 PSI.

Check all your settings against the Stickies.
This is Map 0. You should see no difference than w/o the JB4.
Test on Map 4 (Safety Map) and see if you are still wildly Over Target.

Enable 6 Cyl timing. (though the Target and Boost is what the focus is at this time)

** EDIT ** Also verify the FW is the latest (even though new, confirm)
Could there have been a BEF (Back End Flash) installed w/o your knowledge prior to you buying?

Did you get to drive this for a while prior to installing the JB4?

Rube23 · 02-05-2019, 05:15 PM

Quote:

Originally Posted by codesx

I believe I see the 'blip' on line 24 and 25, looking at the "Throttle". Very brief.
The "Pedal" doesn't show any release.

AFR jumps immediately prior. We're talking only 200ms.
The blip is also reflected in the RPM.

So, Pedal steady, Throttle drops from 48 to 15, then spikes to 68.
Ignition drops from 15 to 1.5. Expected.

Basically, everything responds to corroborate your observed symptom.
Hard to say which is the initiating factor is based on the log. The AFR is the only field that precedes the Throttle blip.

I can't see traction control being related, as you are barely on it.

---

Well, looking at your boost, you are WAY OVER... I should have started there.
You have to figure out why your target is 1.8 and you are pushing 12.9 PSI. When target is 8, you are over 13 PSI.

Check all your settings against the Stickies.
This is Map 0. You should see no difference than w/o the JB4.
Test on Map 4 (Safety Map) and see if you are still wildly Over Target.

Enable 6 Cyl timing. (though the Target and Boost is what the focus is at this time)

** EDIT ** Also verify the FW is the latest (even though new, confirm)
Could there have been a BEF (Back End Flash) installed w/o your knowledge prior to you buying?
Did you get to drive this for a while prior to installing the JB4?

Thanks for looking and responding! The car was bone stock when I bought it but Now I’m wondering if maybe a Cobb tune could have been installed? I doubt it but not sure how i could even check that.
I should mention that on my very first drive after the jb4 install that the car just didn’t feel right in map 1 or 5. I didn’t receive any check engine light but using the jb4 I had this code
2AB4 DME Internal error: RAM-checksum
I cleared it and it never came back. I think I’ll probably physically remove the jb4 just to rule out any issues with the wiring or pins and also check the boost solenoids and related vacuum lines to rule those out.

Dave @ BMS/Fuel-It! · 02-05-2019, 11:22 PM

Quote:

Originally Posted by Rube23

Thanks for looking and responding! The car was bone stock when I bought it but Now I’m wondering if maybe a Cobb tune could have been installed? I doubt it but not sure how i could even check that.
I should mention that on my very first drive after the jb4 install that the car just didn’t feel right in map 1 or 5. I didn’t receive any check engine light but using the jb4 I had this code
2AB4 DME Internal error: RAM-checksum
I cleared it and it never came back. I think I’ll probably physically remove the jb4 just to rule out any issues with the wiring or pins and also check the boost solenoids and related vacuum lines to rule those out.

What is your menu 4 set to?

Make sure it’s set to 4/3 since you do not have the BEF.

Rube23 · 02-06-2019, 05:47 AM

Quote:

Originally Posted by Dave @ BMS/Fuel-It!

What is your menu 4 set to?

Make sure it’s set to 4/3 since you do not have the BEF.

Yes the menu 4 is set to 4/3. I’m Not sure if it makes a difference when map is set to 0 however as the Attached log is at map 0. Is it possible a boost solenoid or hose going bad could cause overboost issues? I haven’t looked yet but I’m going to check the condition of then vac lines and vac reservoir and boost solenoids. I’ll report back
If someone else has any thoughts upon reviewing the log please let me know.
Thanks !

Streetpro · 02-11-2019, 05:56 AM

I had a similar issue while car was responding with a delay or rather not building the boost right of the line and it turned out to be vanos solenoid related... and it was not giving any codes at the early stage...
later it went into blimp mode and caused vanos intake, intake cam position and boost faults to come on...
Perhaps it may be an exhaust solenoid in your case causing too much of cams overlap? If you don't know their condition I'd still take them out, clean&swap them just to rule it out... it had a very positive effect on my previous ride (N53 engine) by smoothing the idle substantially... it is like 30min max procedure...