Sunday, July 19th, 2009 AT 9:24 AM
Check engine light is staying on. I replaced the EGR valve, recycled the light by disconnecting the battery. Light came back on. I have heard that there may be a carbon build up in the block. Do I need to drill or clean that out somehow - and if I do, to what depth do I have to go? I do realize that the gas cap could also be causing this problem, but I need to make sure that my replacement of the EGR valve was done correctly.

