Mezue ahịrịokwu na-esonụ: Guerrero laghachiri na Team Cotter na 1986 iji mee ka No. 2 True Value / Emerson Electronics March 86C-Cosworth DFX (nke 5 na Indianapolis naanị). Guerrero gara n'ihu na-eme ihe ngosi dị egwu na ebe 4th na
Ọsọ ahụ. Guerrero gbakwara ụzọ abụọ nke abụọ, nke mbụ na Escort Radar Warnings 200 na Mid-Ohio Sports Car Course na Miami Indy Challenge 200 na Tamiami Park. Na nke ikpeazụ, Guerrero tozuru oke n'ọkwá ma na-eduzi okirikiri ọ bụla, belụsọ okirikiri ikpeazụ n'ihi na ọ nweghị mmanụ ụgbọala ma nyefee mmeri na Al Unser Jr. Guerrero mechara oge 9th na isi ihe na isi ihe 87.