Nearly stalling when starting from cold

[Tony C]

will get the log up shortly
ta mate

[Tony C]

just looking through MT,
would i benefit from setting in the injection settings Settings-> Injector Settings the fire all banks while cranking? its set to alternate at the moment.

[dnb]

Altenate is fine.  It just means it fires the injectors as normal during start IIRC

[Jorgen]

Without ignition control you should disable the ignition timing base idle control as it can slow down the idle motor a bit. You find it under Extras->ignition settings advanced.

I was afraid that the dual stall behaviour could happen with the new settings. A log would help but I suspect that we can drop the "Idle afterstart RPM, value added" value down to 100 again. I we probably need some code tweaking before an high afterstart rpm will work properly, at the end of the period the rpm target seem to be lowered suddenly instead of fading out.

Under Extras-> Idle settings Advanced, we find "Assymetric PID conf", try setting that to enabled. IIRC this fairly undocumented feature will make the PID more responsive to low rpm then it is to high rpm.

Then there is a setting that I don't find any definition for in a stepper application. It's under Extras->idle settings general and is called "Idle actuator speed/PWM frequency". It should be set to 6 or 7, yours is currently set to 0.

[Tony C]

Cheers Jorgen,
will try these settings the weekend,

thanks for every ones help so far...

[Tony C]

just booted the laptop up,
and cannot find them settings you posted above on my Megatune Jorgen,
is there another version of MT i should be using????

[Tony C]

just found the latest version of MT,
downloading this to laptop now, will i need to upload any other software to the ecu when using this latest version?????????

[Tony C]

just loaded the latest version (i think) of MT, opened my stored .msq file and it came up with a box with errors,
it said something about values wrong, and not to upload to ecu :(

[Tony C]

Without ignition control you should disable the ignition timing base idle control as it can slow down the idle motor a bit. You find it under Extras->ignition settings advanced.

cannot find this mate, im now using MT 1.0.53

[[email protected]]

The MegaTune in 1.0.53 release will probably not work with your current firmware - if you check the version number on the top bar of the window it will tell you what firmware version you are running

Rob

[Tony C]

Hi Rob,

i hope this is the right one:
on the old MT it says version 2.25 beta built on Oct 15 2005

on the 1.0.53 it says version 2.25 built on Feb 5 2006

[[email protected]]

Stick with the earlier megatune or upgrade the firmware to one of the the newer versions.  Upgrading is not a trivial task though.

[Tony C]

ooops been playing with the newer MT but with the old firmware :(

how do you update the firm ware mate???
mmm sounds like another post for you guys on firmware updating,

[Tony C]

still having grief with cold start :(
it idles around 400-500 rpm then picks up to the set 900-1000 rpm at around 77C

[[email protected]]

Question is - is this a IACV or mixture issue?