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Jeep Wrangler YJ
YJ General Discussion
Idle Air Control Valve
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<blockquote data-quote="Gilaguy23" data-source="post: 429203" data-attributes="member: 19498"><p>Check out my recent thread my " TPS issues" on my 91 4 cyl which included new TPS ,IAC's and a TB cleaning. Ive read endless posts on several forums and the same seems to hold true in 90% of the cases. However In your case Id start by disconnecting the neg battery cable and let it sit for a hour or two, some also turn on the headlight switch for a few mins to kill any parasitic voltage left to clear the PCM memory. That seems to be the trick to where to start. Eventually the PCM will "adjust" to the correct idle speed. That's the theory as i read, my 91 still idles at 1100+ rpm from a pre replacement of parts when the idle was around 500. If you pull the IAC again look closely at the tip and you should be able to see if it appears if the pintle is seating 100% or its not due to carbon build up in the TB seat. Id love to know why when you replace the TBS the idle high idle issues begin. Ive yet to find any answer from the majority of the posts related to this.</p></blockquote><p></p>
[QUOTE="Gilaguy23, post: 429203, member: 19498"] Check out my recent thread my " TPS issues" on my 91 4 cyl which included new TPS ,IAC's and a TB cleaning. Ive read endless posts on several forums and the same seems to hold true in 90% of the cases. However In your case Id start by disconnecting the neg battery cable and let it sit for a hour or two, some also turn on the headlight switch for a few mins to kill any parasitic voltage left to clear the PCM memory. That seems to be the trick to where to start. Eventually the PCM will "adjust" to the correct idle speed. That's the theory as i read, my 91 still idles at 1100+ rpm from a pre replacement of parts when the idle was around 500. If you pull the IAC again look closely at the tip and you should be able to see if it appears if the pintle is seating 100% or its not due to carbon build up in the TB seat. Id love to know why when you replace the TBS the idle high idle issues begin. Ive yet to find any answer from the majority of the posts related to this. [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Idle Air Control Valve
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