89 gta,165 6E using tunerpro and autoprom cannot datalog a wot 1/4 mile pass.Can datalog for 1/2 hour around town but the second I go to wide open throttle values are incorrect.Speed incorrect,maf and others are only around half what actually is happening.Any help would be great.
Autoprom settings horizontal switch to the top vertical towards the usb.


thanks

 

I thought the Autoprom horizontal switch is set away from USB ie pass through mode:

http://www.moates.net/mike/faq.html

specifically: Could tell me how to connect with the APU1/ALDU1 step by step?

 

I'll give it a try.Has anyone else had this problem,I mean why is it ok till you floor it?

 

If it datalogs at all then you've got it set up correctly. I don't have any solid reasons why you'd see the data going strange at WOT, but you might make sure that your setup is solid electically. Perhaps there's some floating ground(s), or a bad ECM? Does it disconnect, or just get erroneous in terms of data output?

 

Just erroneous data,clean grounds each head plus the block.It only gives half values on playback.Seem to monitor just fine.

Thanks for the reply

 

Do you have access to another ECM to try?

 

Yeah I'll give that a try.