my truck is throwing a p1514 unknown code once it throws the code it immediately goes into reduced engine power. I went to the dealer and they told me the code is "throttle body performance" it happens everytime I start to go into boost at about 3500-3800 rpms. Does anyone know what may be causing this problem? I have fuel pressure and -ltrims when this happens.

 

Can you give us some more info? Can you put up a log file that we can look at and highlight when the code is thrown?

Off hand .. do you have a ported TB? Maybe something is up with the TPS sensor or something. What year is the truck? More specifically do you have electronic throttle or a real throttle? Did you do anything to the truck before it started throwing the code? Give us some more details to work with plz ..

 

the truck is a 6.0 Lq4 with my 01 5.3 pcm.. i have all the 5.3 accesories the electronic TB and its a procharger kit.... this code is thrown when i get into boost at any point....i havnt tuned it so im not beating it but every time it gets into boost it throws this code..the TB is stock, ill work on getting a log of it up. Before the code throwing started i did a 6.0/FLP 4l60 swap and put the p1sc on...

 

PO1514 is calc. airflow vs rpm vs tps it`s in the diagnostics tab in edit. you need to multiply the whole table by 125% after that any figure that is less then 500 make that figure 500. This table needs to be adjusted in ls1s when running FI Or you`ll have the same problems you mentioned above so that means it probly need to be adjusted in the trucks to. Hope this helps.

 

thanks just made adjustments to a file and ill load it and go try it out as soon as it stops raining