I feel it when I'm coasting on the freeway and similiar situations...

The plot here... coasting at 40 MPH, in 3rd setting at 2500 RPM.



I'm read up on this, but seem to be even more losted... Everything from TPS to bad ground to ingition.

Basic background info...

New O2 sensor (stock replacement narrowband, I'm not reading my ECU with the WB)... replaced like a week ago. universal type from Autozone.
B18B with OBDI conversion... Running uberdata and a base map (something I found online with a similar setup)
I doubled up on my grounding cables (basically instead of replacing my stock ground cables, I added)
I don't know if this is relevent... car is turboed (t3/t4b, dsm 450cc injectors, 2.5 dp.. etc... stock ignition hardware)

Any ideas?

 

Fluctuation is normal with a narow band, am I wrong?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by scartail &raquo;</TD></TR><TR><TD CLASS="quote">I feel it when I'm coasting on the freeway and similiar situations...

The plot here... coasting at 40 MPH, in 3rd setting at 2500 RPM.


I'm read up on this, but seem to be even more losted... Everything from TPS to bad ground to ingition.

Basic background info...

New O2 sensor (stock replacement narrowband, I'm not reading my ECU with the WB)... replaced like a week ago. universal type from Autozone.
B18B with OBDI conversion... Running uberdata and a base map (something I found online with a similar setup)
I doubled up on my grounding cables (basically instead of replacing my stock ground cables, I added)
I don't know if this is relevent... car is turboed (t3/t4b, dsm 450cc injectors, 2.5 dp.. etc... stock ignition hardware)

Any ideas?</TD></TR></TABLE>

Thats what an O2 sensor waveform should look like. Is there something wrong with the way the car runs?

 

When I'm coasting at a constant speed/rpm... I can feel the car hesitate... and pulse...

 

Seems like a tuning issue, or something with fuel.

 

use the o2 correction in uberdata and reduce it little by little until the "pulsing" goes away. i suggest you start at 50% and go from there.

with my 750cc injectors i had to reduce mine to 5% or the car would not run right at all in closed loop.

 

Just to make sure... b/c I took the bin file straight of the net.. so.. I'm adjusting the "IACV Adjust"... Thanks for the suggestion. ... Oh... I'm using the stable version of 1.7. I don't see any there options to change O2.


Modified by scartail at 3:28 AM 10/17/2006

 

you don't have to change the IACV to correct the problem you are having. the IACV adjustment will only mess with you engine idle speed..... if it even works with uberdata.

what you need to adjust is the O2 enrich. it can be found in the "Misc" tab right under TPS enrich, Cold crank enrich and Main Enrich.

if you don't have O2 enrich underneath those option then you don't have the "latest" version of uberdata.

 

Ok.. I found the latest version... It's still labeled vers. 1.70 though. :-D Thanks.