Feels like DI isn't kicking in but no CEL
 

Uhh oh...what did I do? So this morning on my way to work I was stopped at the top of a hill, but when I went to take off forgot I was still in third...chug...chug...die, slight moment of embarrassment. When I went to fire the engine back up I noticed it took several cranks...like so many more than normal that I'm bringing it up. But it eventually turned over and off I went.

I got about half a mile or so down the road and went to turn onto another street and accelerated in first, and instantly noticed that it felt like half my power was missing. For example instead of feeling the slight pull at around 3500 or so there was nothing until around 5500 and even that felt off. Got to work, parked it, thought...eah maybe it's just in my head.

This evening after work, jumped back in and nope...wasn't in my head. No power up until 5500/6000 and it just doesn't feel "right". No CEL though...which I find strange. Almost feels like it's starved for air, like something's choking it out. I pulled the air box off of it just to check and nothing at the filter level or down in the inlet pipe is obstructing airflow (for as far back as I could fit my hand (the piece that runs into the front bumper cover)).

Started thinking maybe the DI system isn't engaging...but you'd think there'd be a CEL in that case. Has anyone else experienced anything like this? Have any ideas?

Not sure if it's worth mentioning or not, but I have a stage 1 OFT flash on the ecu (that was done like 4 or 5 months ago with no issues).

Bonus question: If I wind up taking this to the dealer should I flash back to the factory tune? I mean it's a 2013 that has no warranty left on anything. If I don't need to, I'd rather not flash it back.

Did you fill it with the wrong fuel? My car runs like absolute shit on regular 87 octane. Very sluggish.

Try just doing a battery disconnect reset and see if that helps.
If you do take it back to the dealer it should be on a factory tune or else their equipment won’t be able to access it.

Negative. Nothing but 93 since I've owned it. But your comment does remind me of an issue I had on a DSM once. Fuel filter was trash and so much dirt had gotten into the injectors that they were barely able to fire. Actually feels kind of similar to what that did if I'm remembering correctly.

I've got this OFT. I'm wondering if I did a datalog if that would show anything. Like if the narrowband would report accurately enough that I could tell if it's running rich or leaning out?

Sadly, I just tried this (left disconnected for a good 2 minutes) and it seemed to have no effect. Appreciate the idea though.

The next thing I was going to suggest was datalog and upload to datazap.

RPM, Maf Voltage, Engine Load, Command AFR, AFR, FLKC, IAM


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You may have to drive it for 50 miles or so for any change to be felt. It doesn’t take ahold right away.

Will do the log this evening and post findings (unless the condition progresses into throwing a CEL during today's commute).

Log it in a steady state, IE cruising. If there is anything wrong with the MAF or O2 it should pop out and we can see it there.

Got it. Other than the mentioned channels: (RPM, Maf Voltage, Engine Load, Command AFR, AFR, FLKC, IAM) should I include any others?

Maybe injection mode. Really, we are just trying to see what the MAF and O2 are doing.

I don't see iam in here is that an acronym for something else? Ignition advance multiplier?

It might just say advance multiplier. I can't remember.

Got it. I'll have these graphs up in the next couple hours.

Log successfully uploaded to datazap: https://datazap.me/u/ziltoid/001?log=0&data=1

Started from a dead stop on an on ramp, accelerated then cruised for about a mile or so, hit stoplight...waited...then did another pull and cruised for maybe 1/4mi