TorqueZombie

iTrader: (6)

Ever since I updated my firmware the issues are coming out of the woodwork. I didn't drive it much for a couple weeks while sorting out the firmware update. I drive 60 miles each way for school a couple times a week and I've noticed an odd hesitation I can't seem to find in the logs and not sure what to look for.

Cruising down the highway at appox. 75mph ish it seems fine, but it feels like the car misses a cylinder every so often. My wife noticed it last night coming home so it isn't just in my head. If you stare at the afr gauge it VERY quickly, as in almost imperishable, blips the gauge quite lean. I've been trying to figure out if it is related, but ever since the update VEAL wants to pour fuel at high rpm and low load. It's trying to crank fuel up about 20% or so. Nothing mechanically has changed as far as I can tell to call for this weird issue. I've been looking for vacuum leaks and anything that could have changed.

On the highway if you wind up the motor to 5-6k rpm and hold it there is feels like the car is missing and "stacking up" sometimes. Imagine if you drop a couple gears to pass and hold it waiting for a spot to open up and the car sputters and if you mash the throttle it goes away. I let VEAL mess with it a bit and if I allow the VE table to go rich as hell it gets better I think, maybe placebo effect. It doesn't do it every time, but fairly often.

I think I just realized I can look at .csv in megalog viewer haha. Looking at page 30 it looks like the sensors just cut out for a tic and resume like all is okay after. Can someone school me on reading logs? I've only been looking at the live feed and screen captures until now. Can I somehow take all that .csv file, jam it into excel, and graph it to look for a squigly graph with a sudden drop to zero to find issue spots. I'm still a bit lost. Every time I swear I have a handle on this new issues come up.

As always I really appreciate the help and for some reason my laptop isn't saving the datalogs from last week. I'll see if I can replicate the stutter on Monday. It snowed here last night and I have adulting to do until then.

TorqueZombie

iTrader: (6)

Apparently the .csv is too big. Here is the shareable link.

https://drive.google.com/open?id=0B8...HpCVGtROGFGVEE

Matt Cramer

Can you post a regular data log of this as well?

shuiend

iTrader: (24)

When you are driving and taking a normal datalog, next time it happens hit the space bar button. This will cause a mark in the log so you know where to look when you go to review it.

TorqueZombie

iTrader: (6)

I'll try to get a normal data log tomorrow night on my drive back home. I'll try the data log space bar again. My only problem is the last couple logs didn't save for some reason. My old tuning laptop is having some issues currenly and it just may be time to replace the old girl.

TorqueZombie

iTrader: (6)

Here are the last two from the drive home. I've scanned through them, but to be honest not sure what I'm looking for. I can see the blips in afr and the MAP and Tps seem solid horizontal lines. It feels like somethings breaking up, but I can't find it. I know as per usual I'm missing something simple.

TorqueZombie

iTrader: (6)

This file near the end gets spazzy.

• DataLogs\2017-03-15_20.24.18.msl

This one I'm not sure of as it was the first bit of the drive.

• DataLogs\2017-03-15_20.03.58.msl

I do apologize for the repeated hits to the space bar. I was driving at the time and wanted to ensure I hit it in the dark car without out looking and to try to hit the spacebar repeatedly while an event kept happening to try and give a beginning and an end to the event.

TorqueZombie

iTrader: (6)

The more I play it in my head the more I think a crack in the header may be the issue. Engine bay checks out at least by visual and grab it and shake it methods. Like wiring or vac leaks. Small bits of air getting in a crack might **** off the afr sender......

Matt Cramer

Both the MAP sensor and the TPS dropped to suspiciously low readings - it's like the ECU lost part of its VREF.

TorqueZombie

iTrader: (6)

Huh, I sort of see what you mention. I looked at the logs again and it does appear that the MAP and TPS just drop to low levels for unknown reason. It should be mostly highway cruising so it is suspicious. I'll try to recreate it and ensure the drop is during driving and not just throttle lift. I'll be back at the car saturday and I'll see what I find. Thanks, it gives me something to looks at. I'll check the wiring.

I should verify that Vref is the +5volts to the TPS and the MAP. Odd thing is I'm using the internal MAP sensor in the MS3 box. Not sure if they are junctioned together in the box, but thought I'd ask/mention it.

TorqueZombie

iTrader: (6)

Hopefully to finish this out the header may have been the issue. A couple weeks ago I swapped in a new Racing Beat header and without changing anything else and I can't seem to get the surge to come back. I can't see any cracks on the old knock of OBX I had, but it was at least second hand to me. Who knows. Maybe I'll build a pressure test rig, or just toss it in the metal bin to make sure it doesn't hurt anyone else.