No power under part-throttle. Normal at WOT.

[Azrael]

At part throttle while in drive the engine struggles to bring the RPM up and will almost stall unless I either give it WOT or back off. In park\neutral it revs fine. While coasting in either drive or neutral there's no more resistance than before. No SES light or errors that TunerPro can see.

To completely baffle me, I was nearly home and stopped at a stop-sign and everything went right and my car drove like normal since.

I logged a scan with ScannerPro while this was happening in case someone wants to see if they can spot something I'm missing. I had to rename it to upload to the forum so rename the extension to .xdl to use it. The log doesn't get to the point of everything working right again.

Ignition coils, ICM, plugs and wires, TPS, CTS, IAT, and MAP are nearly brand new and the car ran fine with them before this started. Could I be looking at a bad crank or cam sensor?

[IsaacHayes]

Crank sensor would still be crappy at WOT. I'd look at MAP. Is it a cheap sensor? FPR not leaking and dumping fuel? CTS in the right range?

I don't have TP on this pc, I'll have to grab my laptop. What def did you use to log? The one on the TP site doesn't record data, and neither does mine, but Wicked_irocz has one that does (strange they all work in real time though)

[asylummotorsports]

I just went through almost the same damn thing I think.

See my post under "3500 Problems".

Looks like it was the O2 sensor.

Hope this helps.

[Azrael]

Crank sensor would still be crappy at WOT. I'd look at MAP. Is it a cheap sensor? FPR not leaking and dumping fuel? CTS in the right range?

I don't have TP on this pc, I'll have to grab my laptop. What def did you use to log? The one on the TP site doesn't record data, and neither does mine, but Wicked_irocz has one that does (strange they all work in real time though)

FPR isn't leaking that I can see. With the vacuum line off, gas isn't coming out while engine is running. I was using the def file you posted awhile ago for ScannerPro which you mentioned does log data properly.

I just went through almost the same damn thing I think.

See my post under "3500 Problems".

Looks like it was the O2 sensor.

Hope this helps.

I'll have a look. It could be the O2. I'm using the NB output from an LC-1 wideband for the PCM and I have heard a few grumblings against doing that.

[IsaacHayes]

Ah scanner pro did not catch that. I have a new one for tuner pro that wicked_irocz made and it does log fine. It is not complete like mine was, and does have a few things not accurate like TCCslip but it does log correctly. I plan to try and go through mine when I have time and see what is causing TP to choke when recording... Just as soon as I get the other mods and to do list done on the car :P

[robertisaar]

ORLY? so now exporting to CSV isn't broken for the SD 3100s?

[IsaacHayes]

For OBD1.5 yes. This is Wicked_Irocz's def, like I said it's not complete or accurate on everything, but for datalogging the crucial stuff it works.

http://isaachayes.60degreev6.com/aldlcable/1994_3100_Beretta_update_09.ads

[robertisaar]

i looked at it, but there aren't any real differences, at least command wise and anything else that should matter. i know yours is a lot more filled than that one and mine is probably compareable to yours, give or take a bit or two.

confusing to say the least... but whatever, i don't have any need to log with 1.5 anymore...

[IsaacHayes]

Yeah I'm guessing it's more a bug with TP than the def. Maybe too much going on for it to handle??

[robertisaar]

i hope not.... the northstar ADS i made probably has at leat 2X as much stuff...

most overengineered ECM EVER!

[Azrael]

Nothing to update on yet. It hasn't happened again. I wonder if a bit of debris covered part of the ring for the 24x crank sensor or it's started to hit the end of it's life. Or the LC-1 was hitting errors, in which case it defaults the afr output to stoich regardless of what it actually is.

[60dgrzbelow0]

Throttle Body Service...and replace the Throttle Position Sensor?

[Azrael]

TPS is less than a year old and there's no voltage drops that I can see through the aldl or megasquirt. I'll have a look inside the TB itself though.

[Azrael]

After comparing the log while it was acting up to a log where it worked fine I conclude the LC-1 was throwing errors for whatever reason. The first log showed the O2 ouput at a very steady 500mv whether or not the PCM was running in open or closed loop for the whole log. This is what an LC-1 will do when it experiences errors. The 2nd scan showed the O2 running the full gamut of 100-900mv.

[IsaacHayes]

So you are megasquirted now and running? How does the stock ECM like controlling the trans side by side? What sensors do you have still going to the stock ECM? CTS, RPM, VSS, TPS, and MAP? I think all those are needed for it to control the trans still. Yes even CTS as it won't lock the TCC if it think's its too cold.