cannot adjust idle

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rogmit

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I just got my 92 ford bronco with a 5.8 liter engine back together and I'm working thru the issues 1 by 1. I got the timimg set properly but it will not let me adjust the idle. I have the idle ***** adjusted all the way out and it still idles between 900-100 rpm. I think it has something to do with the TPS but I'm on a budget here and am not going to start throwing parts on it. So, if anyone has any ideas where to start let me know.

 

miesk5

96 Bronco 5.0
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yo Rog,

From your recent posts here you wrote that there are no KOEO or KOER Codes; correct?

How to adjust idle speed (official Ford procedure)

http://www.supermotors.net/registry/media/624983

Idle or Noise Problems & Troubleshooting; including HIGH IDLE Conditions; "...For high idle problems, try unplugging the IAC motor. If the idle drops, its usually due to an input signal to the computer which results in the computer raising the idle speed. If this is the case, look at all of the computer inputs to make sure everything is up to par. If the engine RPM does not drop when the IAC motor is disconnected, then either the IAC motor is not functioning properly, or, there is a vacuum leak in the engine. Stop the engine, remove the IAC motor and block off the passages. Restart the engine to see if there is any change in engine RPM. An idle speed higher than base idle specs indicates a vacuum leak. If the engine RPM is at base idle specs, then the IAC motor is bad. Resistance specs are 7-13 ohms. A good resistance reading does not necessarily mean that the IAC motor is good. Occasionally, an IAC motor will become weak, and will actually bypass too much air, causing a high idle condition even though everything else is operating properly..." READ MORE

Source: by Mike N via Joe D at http://web.archive.org/web/20100919152357/http://carquest.com/common/downloads/partsTechEnginett3q00.CQ.pdf

Sensor IAC Gasket Mod by NELBUR http://broncozone.com/topic/22150-fast-idle-problem/?&pid=115710

 

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