1992 Ford Bronco Malfunction - Engine

Question: Hey guys- really appreciate your time. I do the same on insurance stuff, spread the knowledge! 92 motor in an 87 frame, EFI, Eddie Bauer edition. Trying to trouble shoot a reving problem. For one- Idle keeps going up & down on it's own, not much but enough to say something isn't right. Replaced the throttle position sensor (you go girl!). Worked ok for a month. Now, when the engine gets warm, it goes to a very high rev state at idle- like 2500. And it's still not maintaining a steady idle, grr. Replaced the EGR & coil. 92 motor in an 87 frame, one step down from the biggest motor in it, 4wd w/lockouts. Think maybe the throttle sensor is cracked and/or not properly positioned? Or anything else you can suggest that would cause a slight up down in rev to not carry a steady idle. Oil pressure also likes to run on the low side, will check the oil pump pickup screen. It also has a transmission kickback thing- if you let up off the accelerator at 40mph -60 mph or so, the engine/trans sort of kicks back, like it goes down a gear in the trans before it really needs to. Hard to explain. Appreciate any advise pertaining to similiar bronco issues And thanks again for your time. :) Denise

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Technican: Check the idle speed motor. You work online? What kind of information do you provide??

Technican: Hi; Might want to try this. It sounds like an Idle air control motor problem. Go get a can of throttle body cleaner. Start the engine and let get to operating temp. While reving the engine up spray the cleaner into the throttle body until you have used up the whole can. Use a continuos swirling motion . After all done disconnect your IAC motor and set your base idle. Turn the throttle plate adjusting screw until it just runs. Shut off, Disconnect the battery for five minutes. reconnect connector at IAC. Reconnect battery start engine and put in reverse and hold brake for five minutes. The idle will fluxuate until it finds a base idle. GOOD LUCK LES>

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