Solved !! This might not apply to all of you but I run the aem 0300 had the same issue till I realized when wiring the db9 female to the truck the aem wiring diaphragm is backwards hope this helps...
Type: Posts; User: mat1255
Solved !! This might not apply to all of you but I run the aem 0300 had the same issue till I realized when wiring the db9 female to the truck the aem wiring diaphragm is backwards hope this helps...