I had a check engine light and trouble code PO 442. Replaced the charcoal cannister, purge solonoid, and gas cap. I cleared the check engine light and troublecode with my code reader. I took it to the chev dealer and had the evap nitro smoke test done on it. They said it was working proper and sealing good. They told me it would take several cold starts to make the vapor IM sensor go from incomplete to OK. They said I would have to perform several drive cycles to get cat IM sensor to do the same. My question is exactly what does a cold start consist of and what makes a complete drive cycle for 2003 4.8 V8 silverado?
Thanks Robert C. Lowry @ letseelc@aol. Com
Tuesday, January 3rd, 2012 AT 7:57 PM