I recently had a problem starting my 2003 4Runner (V6) SR5. Upon cold start in 80 degree weather, a loud repetitive noise occurred. It sounded as if the fan was hitting up against something. I immediately turned the engine off and tried again. This time it was a little slow cranking, but started, and with the same noise. But I also noticed an odor as if something was burning. I immediately turned the engine off again and waited until the next day. The next day, the engine would slowly (very slowly) crank, but would not start (did not notice any odor.) That's when I called a tow truck and towed it to Toyota's service department. Toyota didn't get to it until 2 days later; however, they told me that upon starting the engine, everything sounded and checked out normal. Sure enough, when I picked up the vehicle, it did not display any symptoms. I call this the mystery starting problem.

Anyone encounter a similar problem???

Thanks for any help or info.