Haven't noticed any ticking or excess noise or obvious places fumes could be coming from under the hood but don't know much about vehicles. I do know I love my 93 T100. It's an automatic SR5 with 315k miles.
What makes this problem better or worse?
Is a serious issue on a long highway trip when windows can't be opened
How long has your 1993 Toyota T100 had this problem?
RepairPal Certified shops can diagnose and repair your 1993 Toyota T100. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.