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How can I test the IAC? Unplug Idle Air Control valve and Jeep still runs... | Jeep Enthusiast Forums
Should I be able to unplug my my IAC and the Jeep still run? The reason I ask is because I can do just that and the Jeep doesn't stop running or change anything at all - runs exactly the same w/ the IAC unplugged as it does with it plugged up. I'm not real sure how it's getting air to idle (unless I have a massive vacuum leak) unless the IAC is bad.
Should I be able to unplug my my IAC and the Jeep still run? The reason I ask is because I can do just that and the Jeep doesn't stop running or change anything at all - runs exactly the same w/ the IAC unplugged as it does with it plugged up. I'm not real sure how it's getting air to idle (unless I have a massive vacuum leak) unless the IAC is bad.
I have been running for a year with the IAC disconnected in my 94 ZJ. Runs great, no irradic idle ever. Disconnecting was the best test of my IAC. Normally starts in less than 1 sec. however on very cold Winter mornings it takes almost 2 sec. to start and idles a little sluggish for about 1/2 mile.
The approved test is to watch the rpms compensate for A/C operation. Turn on A/C and the rpms should dip briefly, then the IAC should immediately compensate for the compressor load.
When i cleaned my IAC during this past winter, i accidently left it and another sensor unplugged and the Jeep would start, but wouldnt idle and would die within a second or two. i looked bacvk under the hood plugged em in and everything was ok.
plug in the IAC, plug in a scanner - command RPM change thru IAC function and observe.. Yeah having the tools can help.
Lets try basics - what year engine etc*, ideally scan for codes ( part store) post all codes..
Can you work with A DVOM and wiring diagram, I suspect code are present.
Um, because it was at the top of the forum? It was just by happenstance that when i looked back at the original question i saw the date and realized how old it was. Since jtec was asking questions as if it was a current troubleshooting problem, i thought i would point it out.
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