BMW S52 - Idles but wont run off idle

[Dandeman]

Feeling super new ...

Initial start up this weekend.  The car will idle but as soon as you touch the throttle it will die.  Looks like it will go way lean.  It also does not sound right - but obviously not able to check base timing.

Also I have the back fire issue when you cycle the key and restart the ecu.  I do need to check to see if there is a vacuum leak caused by this misfire.

I feel like I have not turned something off, and there is a conflict in the software.

This car does have mild cams and bigger injectors than stock.

I have attached the file I was using.  Any additional direction would be helpful.

Thx!!

BMW E36 G4X Dan Initial Set up.pclx

[Adamw]

Our ECU is not designed for the S52.  Have you changed the wiring to match the M50 pinout?  What do you mean you cant check base timing?  That should be one of the first steps.   Have you adjusted the master fuel while running to see if more or less fuel helps?

Also, doesnt the S52 have dual vanos?  If so you will need to use the S52 trigger mode.  Can you do a triggerscope - either cranking or idling.

[Dandeman]

Hello Adam!

Yes - running the M50 harness and components.  Sorry - the "US S52" if converted back to OBDI, or M50/S50 will run just fine - all single vanos.  Apologies for the confusion - I should have been more specific.

Adding or subtracting master fuel did not change this condition.  Also, I feel like when you first started the car hot, it took a few seconds for the idle to come up to set point from being very low - like 600 rpm.

I will try and get a triggerscope to you at some point.  I do need to check timing, even at idle. 

Also need to check all lines in the intake as the backfire thing may have popped a line off - though I would not think this would change the MAP readings.

[Adamw]

Confirm base timing first.  Then give us a log and triggerscope.

[koracing]

Try turning off transient ignition retard (or check the new version software base map where this is turned off to compare). 

[koracing]

deleted

[Dandeman]

Hello Adam!

I turned off a bunch of settings or set them to open loop or off (thanks koracing - this helped).  Idle, lambda control, etc.  Car is now basically in open loop.

Checked base timing at high idle - this was off 10 degrees and now corrected to -318*. 

Changed / calculated master fuel and fuel mixtures based on what I was getting before for a mixture number and adapted the base file mixture.  Unfortunately I do not have data from Bosch for my injectors which would have helped.  Even though, I did get pretty close - within a couple percent at idle.

Car now idles at a good set point and I can actuate the throttle without it wanting to die, though it still wants to go lean.  I now feel like it is mixture / timing as I can adjust this and get differing results.  Also I feel like I can now get it into the trailer to get to the dyno and be productive there.

Trigger scope is attached.  Also attached the main file again.  Please provide any feedback if you see something interesting.

FYI - I believe the back fire thing is related to actuating the ignition switch from run (position 2) back to position 1.  US cars need to do this, which resets the ability to engage the starter from the switch, but also cycles the ecu as you go back to position 2.  I'm guessing there is a signal sent from the ecu at initial start up, and this may ignite fuel in a cylinder if it was just previously running.  This was solved by using a remote starter switch.

TriggerScopeLog_DanBMW-12-28-20.llgx BMW E36 G4X Dan Initial Set up.pclx