Commanded AFR going stoic at WOT

[1271330697]

Hello

I am facing the problem that above 4200 rpm on WOT, the commanded AFR goes to 14.6 and the actual measured AFR does the same.

My question, where does the commanded AFR come from in the software and can you tell anything obviously wrong in the cal file?

The engine has a supercharger conversion, btw


TIA for your input

[Ben C]

That should be check tps voltage at wot.

[Ben C]

Check tps voltage with a multi meter. If it goes above a certain value it will drop out of pe. Throttle position in the scanner will still show 100%. I think it was 4.5 v but can't remember as it was a while ago I dealt with same issue.
That should be check tps voltage at wot.

[outoftune]

Scan a pull and note at what HZ the Maf is at when your at 14.8 at WOT and commander is 12.5. Then raise all cells in those areas by 15%. Good luck.

[1271330697]

Thank you for your reply, to both of you.

[jabbott1]

Just experienced this today on the dyno. Anything over 4.75 tps volts at wot will cause it to go stoich at 4200 rpm. It needs to be over 4.3 but under 4.7 at wot.

[Ben C]

apparently another way to cheat it rather than adjust the throttle sensor is to increase the max tps voltage ( TPS high Fail) in engine diagnostics section