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Re: Long term effect of exhaust valve not opening
Posted to Technical Theory Forum on 7/21/2023 2 Replies

4 valve engine. Failure is confirmed by visual inspection. Valve cover has to come off to replace the ICP sensor. The noise is how they usually present. Truck is gone so I can't get a pattern. misfire detection by the ECM didn't start for NAV until maybe 2007.... Login to read more.

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