Fuel injection trouble
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Fuel injection trouble
I recently had my 93 351 bronco rebuilt and i had the mechanic put a bigger cam in it and now the truck wont idle right. I have replaced the positioning sensor and idle control valve and it still will not idle right. Ideas?
Hotshot
Joined: Oct 2002
Posts: 18,488
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From: The Big, Oregon
How big of a cam? If the idle is lopey then the computer probably can't figure out what is going on. Old speed-density systems are a lot more sensitive than mass air systems, since the computer reads manifold vacuum to calculate load and determine spark timing, fuel amount, and IAC position. If the vacuum is all over, then it won't be able to figure it out.
However, if you adjusted the throttle plate you will have to reset that to factory specs, otherwise the engine will stall constantly at idle.
However, if you adjusted the throttle plate you will have to reset that to factory specs, otherwise the engine will stall constantly at idle.
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