Is that normal?

 

Its because your car is running solely on the open loop tables when you first take off. Log the issue and see what your AFR's are doing when it hiccups and the RPM/LOAD range, mine would go way lean (17+ AFR) and it would bog a bit. I adjusted the open loop tables in the problem areas and never had the issue since. Since its in open loop, there is no fuel trim, just the table settings which are set in stone.

 

I am getting the same problem as inprogress. When I pull inot my inclined driveway and give the car gas and then come to an immediate stop, then the AFR fluctuates and goes really lean (17-18:1). Then it settles back down to 14.7:1. This started happening after I installed the AEM intake. It is annoying and would like to fix it.

What specifically did you do to the open loop tables? Your talking about the two open loop tables in the rom, right?

Thanks

 

Hmm, ok I'll try and log it and post it here in the next few days since I'm out of town right now.

Thanks for all of the help everyone!!!

 

NJ,, I don't want to talk over JOT
but

pretty sure, as you think, he is correcting his fuel map in the area he saw the lean spot.
But, if I read him correctly, he is just talking about right after start up, when his car is still in open loop.

Sounds like you are referring to a warmed up car. In which case you could change the open loop load, that would change that problem area to a map tunable condition.

Since it sounds like an anomaly I'm not sure changing the open loop area will not affect a more general aspect of daily driving as well. Lets say you conquer the lean spot, since it may be a generally used load /rpm area, then that generally used area will be affected too.

hopefully, your lean condition is not normally exercised.

 

Inprogress, I made a video of my car on a cold startup this morning (85F 49% humidity, deep South Texas). It hunts at startup and again around 1:40, is that what your talking about?. You can hear little misfires here and there, something I always thought was pretty standard fare for an Evo.

http://videos.streetfire.net/video/C...Evo_166119.htm

 

Mr. Evo IX,

Did you turn on the A/C during that video?

I believe mine does what yours did during the start of the video (not sure because I couldn't see the RPMS clearly) but it was towards the start of it the video.

I also noticed it happening again during the 1.41 mark, I believe mine behaves the same way.

I'll try and take a video of it from my camera (I just realized my point and shoot records video w/sound) as soon as I get home.

 

AC was off.

 

Ok so I tried more logs, i did a near 20 min cruise and 14 minute idle log and the trims did not change. During the cruise, i went on hills so the car would see inclines and declines, but the trims did not budge out of 100.

I havent tried changing the scaling to see if that causes the trims to move around, so i'll prob try that soon.

Anyone have any other thoughts?

 

Maybe you could try the scantech software as that shows trims changing in realtime and then I think the ECU averages these values somehow and then writes them to your longer trim values like the one in Evoscan or mitsulogger. This might provide insight as to what is going on. My midterm trim would not budge if the scaling values was way off with my injectors.

 

Ohhh, are you using the standard 100% scaling in evoscan? I had that issue at the beginning and when I changed everything over using the (0.1961*x)-25 formula for the +/-25% scaling, everything actually moved for the first time.

 

this is the current eval

0.78125*x

Is that off?

 

anyone?

 

I logged for over 16 minutes and the trims did not move while I was cruising. The formula is the one you're speaking of (0.1961*x)-25 and still no difference.

Any suggestions?

 

Was your 02 feedback % changing?

I use mitsulogger for fuel trims. Just seems to work better for me.