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Old 03-09-2021, 05:16 PM
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The OCVs have very tight fitment of the spool valve in the bore; a bit too much varnish can sometimes make them sticky and cause the DTC. Also an intermittently failing/weak coil can contribute to the issue, sometimes you might not notice a drivability issue.

Basically it doesn't have to be sludge in the sense of thick, chunky stuff; as MidniteTRD said, could be just a bit extra varnish on the valve and bore.

It's an issue that pops up every now and then on a lot of stuff.
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