Not sure what to make of this, log included

[ddevil]

I've been noticing my AFR sometimes as low at 8.8 and was logging my drive all the way home today and caught something but I don't know what to make of it. I was driving on the highway and it felt like I lost a bit of power all of the sudden while cruising and I immediately let off the pedal and and everything seemed fine the rest of the way home. The logs are in this spreadsheet under the worksheet 'Issue'. You can see the AFR suddenly drop to 8.96 and then WGD jump to 57% out of no where. I have been getting a P0401 for the EGR exhaust gas recirculation insufficient. Not sure if that could cause something like this.

I also did a quick 2nd gear WOT to see what would turn up in the logs. In that one you can see the AFR is really rich dropping down into the 9s. The logs for this is in the same spreadsheet above under the '2nd WOT' worksheet.

Does anyone know what to make of these or should I be concerned?

My mods are BNR S1, HTP 2.5" Turbo Inlet, GS EBCS, and Freaktune OTS+Map.

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Last edited by ddevil; 11-17-2014 at 04:41 PM.

[chaser27]

Might want to actually attach the file here instead of a link somewhere else. 2nd gear log isn't going to give us anything. Try 4th or at least 3rd.
If AFR is dropping and holding 8.8 you probably have a mechanical issue somewhere. IE. boost leak, but I would get with @Justin@Freektune since he is your tuner

[rfinkle2]

@Justin@Freektune.com; You are having some sort of electrical issue, imo.

For whatever reason, your throttle position is spiking to what the ecu thinks is full throttle.

I would

1) clean the connection @ the throttle body
2) hard reset the ecu.

3) Wait until Justin gets with you until you drive the car hard.

This is likely just a bad connection and nothing overly concerning.

When the ecu interprets the TP as full throttle, it is driving the bcs so you see wgdc spike.

[ASHMS3]

Provide a little more info too, Year/model/mileage of the car?

[ddevil]

Thanks, I'll try those as soon as I can. I emailed Justin a couple days ago but haven't heard back yet. I'll go ahead and send him the logs and take it easy on the car until I can get a response.

Originally Posted by ASHMS3 Provide a little more info too, Year/model/mileage of the car?

2007 MS3. 94k but with a brand new motor and turbo. About 500 miles on those.

[Agent_Orange]

You need to take WOT logs in at least 3rd gear, preferably 4th. Your also missing some important parameters to log, like Injector Duty Cycle. Just log everything.

When you experience the power drop and AFR going rich, is it under hard acceleration? Do you have the wheel turned at all? When you see AFRs drop into the 9.xx region it's usually do to SWAS intervention.

[ddevil]

Originally Posted by Agent_Orange You need to take WOT logs in at least 3rd gear, preferably 4th. Your also missing some important parameters to log, like Injector Duty Cycle. Just log everything. When you experience the power drop and AFR going rich, is it under hard acceleration? Do you have the wheel turned at all? When you see AFRs drop into the 9.xx region it's usually do to SWAS intervention.

Probably wait till I hear from Justin whether he things it's safe to do WOT then I can get some better logs. This is only what I had from today just logging a normal drive home.

The short power drop was while cruising on the highway going straight. I believe I was going over a dip in the road though which could possibly have triggered SWAS? Not sure what would cause the low AFR though for the 2nd gear log.