MSefi.com read only forum (Jan.15,2018)

Multiport EFI on a 66 Triumph TR4a. It idles nicely, but to pull out from a stop you have to gradually increase the throttle to get the revs up, then it has pretty good power but only for about 1/4 to 1/3 throttle. Push the gas any more than that and it stumbles badly. Let up on the gas and ease it down and the power comes back on. I have tried adjusting the fuel map but can't seem to make a difference. What could be causing this and how do I fix it?

Thanks

Dan B

Possibly this is more tied to the ignition map. I have tweaked it some after talking to Jim Blackwood, but right now I can't get TS to connect to my controller. It cannot recognize the signature. It says my controller has * version. It should be 2.3....

IMHO, the ignition map would have to be miles out to cause a stumble. Far more likely to be mixture too weak. Have you got a wideband O2 sensor fitted? This should show up the problem instantly.

Please post a data log of the problem and a copy of your MSQ file.

The datalog from Sunday's drive.
The tune.


Thanks!

Over a year later?

Your AE is triggering way too easily; try increasing the TPSDot threshold to 75%/sec.

What sort of O2 sensor are you using, and what calibration data?

I'll try that. I'm using an LC-1. Not sure what you mean by calibration data. I did recalibrate the sensor in fresh air following Innovate's instructions. Am I missing something in TunerStudio?

Yes, Dave, I had to pull the engine and change the bearings over the winter. Just now getting back to tuning.

DanB wrote:Am I missing something in TunerStudio?

It's under Tools -> Calibrate AFR Table. Please re-send the LC-1 default settings. It seems you are using a different calibration as some of the readings in the data log are out of the range a standard LC-1 calibration will supply.

I played with it some this weekend after brother Jim helped me tweak the tables a couple of weeks before. I have not done the software calibration yet. Perhaps that will make a difference. Here is the data log from Sunday.