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Jeep Wrangler YJ
YJ General Discussion
Idle speed and pintle length
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<blockquote data-quote="machoheadgames" data-source="post: 431072" data-attributes="member: 18789"><p>The computer absolutely knows what the rpm of the engine is as it is the same device sending the rpm reading to the tach gauge. Pretty certain the PCM uses the rpm and readings from 5-6 sensors to set the idle speed as it sees fit. Whether or not that is a comfortable rpm to us owners is a different story.</p><p></p><p>Is it idling at a lower rpm with the oem IAC in place and extended to 1.3” like you said?</p><p></p><p>And yes, if you extended the iac outwards it will idle slower as that blocks off more of the idle air running through that part of the throttle body. However if the computer determines it doesn’t like that, it will pull the pintle back in more so it can idle up some again.</p><p></p><p>I am really surprised Standard tells you to set it to a specific length. I have never heard of that and I don’t see what the point of that is because the computer is going to constantly change it anyways. The aftermarket one I got from oreilly I believe was standard and was not adjustable, although maybe being for a 4.0 was different than 2.5 because I know they are different parts. Still don’t see why it would need to be adjustable though.</p></blockquote><p></p>
[QUOTE="machoheadgames, post: 431072, member: 18789"] The computer absolutely knows what the rpm of the engine is as it is the same device sending the rpm reading to the tach gauge. Pretty certain the PCM uses the rpm and readings from 5-6 sensors to set the idle speed as it sees fit. Whether or not that is a comfortable rpm to us owners is a different story. Is it idling at a lower rpm with the oem IAC in place and extended to 1.3” like you said? And yes, if you extended the iac outwards it will idle slower as that blocks off more of the idle air running through that part of the throttle body. However if the computer determines it doesn’t like that, it will pull the pintle back in more so it can idle up some again. I am really surprised Standard tells you to set it to a specific length. I have never heard of that and I don’t see what the point of that is because the computer is going to constantly change it anyways. The aftermarket one I got from oreilly I believe was standard and was not adjustable, although maybe being for a 4.0 was different than 2.5 because I know they are different parts. Still don’t see why it would need to be adjustable though. [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Idle speed and pintle length
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