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Old 29-07-2021, 08:59 PM   #41
undertow
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Join Date: Feb 2010
Location: Melb
Posts: 166
Technical Contributor: For members who share their technical expertise. - Issue reason: AU Aux input HOW TO. 
Default Re: XR8 idle hunt (video)

Thanks, yep looks like a vac leak, that idle MAF airflow is well below the normal range. Unmetered air getting in, so it runs lean and the fuel trims go strongly positive to try and compensate. If you go for a drive and log it you'll likely see it running lean/fuel trims going right up during closed throttle, then come back to normal with more load (more load lessens the effect of the vac leak).

The O2 sensors look to be switching OK to me but it doesn't hurt to replace them anyway at this age.
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