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Old 01-20-2022, 09:45 PM   #108
billr
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Join Date: Jul 2013
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Default Re: specifics on compression testing, P0301

Blocking the EGR passages should set some codes, but I would not expect P0340 to be one of them. Put the EGR back to stock and see if the P0340 goes away. Then block/unblock it again a few more times, to see if that is a repeatable symptom.

Can you summarize what effect, if any, blocking the EGR has made on fuel trims? That was the main reason for suggesting blocking the EGR, to see how it affected trims.

You are using live-data to check the TPS? Does the live-data show injector pulse duration?
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