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Have you cleaned the throttle body itself? 700 1990

posted by  someone claiming to be JohnB on  Thu Jul 28 11:27 CST 2005 [RELATED]

One shouldn't adjust the TPS without ensuring the throttle body is clean and the butterfly is indeed closing against the butterfly stop screw. Said screw is NOT to be used to adjust the idle...it is just to ensure the butterfly is closed but not so far as to stick when opening the throttle.

I've NEVER had to adjust a butterfly that wasn't messed up by an owner/shade tree mechanic...they're adjusted correctly at the factory nearly always. The issue is a dirty throttle body that won't let the butterfly close and someone adjusts the TPS so the switch closes on the slightly open butterfly. Of course then when the engine is warmed up it doesn't respond correctly when the throttle is opened.





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