You certainly got enough wrong answers and short answers. 1) The fellows that suggested too much fuel are most likely RIGHT. That is the primary reason for a catalytic converter to overheat. The catalyst is actually there to finish completing combustion of the fuel that the engine has not completed. If the engine is running too rich, it will overload the catalyst. 2) Whatever someone did to their Toyota or neon 5 years ago has NO RELEVANCE to your problem today. Too lean of a mixture will cause idling problems, but will NOT cause a catalyst to overheat. Vacuum leaks typically cause a lean mixture that will generally NOT overheat the catalyst. 3) As to cleaning the throttle body - CHECK with the service manual. Some throttle bodies are NOT to be cleaned. For example, Fords since 1991 have throttle bodies that will be damaged by cleaning, and have warning stickers on them about it.
Janicholson had the right answer as to where to start. Also look into a ruptured diaphragm in the fuel pressure regulator. It is a smatt device that looks like a small canister on the fuel rail with a vacuum line going to it. Check it by taking the vacuum line off and looking for wet fuel at that point. It should be DRY.
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Today's Featured Article - Show Coverage: Argyle and Mt. Pleasant Labor Day Weekend Shows - by Cindy Ladage. The last fling before summer fades into fall and we get busy in the fields are the annual Labor Day tractor shows. Beginning on September 5th and running through the 7th, the Argyle Antique Gas and Engine Show is held at the Argyle State Park. Located in West Central Illinois, the pine forest was the setting for the opening of the 22nd show. This year we decided to try to sell a few tractor parts, literature and wrenches to offset my husband's buying sprees. Saturday
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