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Old 02-17-2021, 10:13 AM   #13
bobxyz
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Join Date: Aug 2014
Location: Boulder CO
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Try a power balance test. At idle, disconnect one injector at a time and see if all the cyls behave about the same. You may need to give it some gas if it's not running well.

If one cylinder makes little or no difference, check the injector and plug wiring carefully for that cyl. Have you used a compression tester before (if not, ask or google)? If you have one, or can borrow one, a compression test would help diagnose the problem.

Another simple test, on a cool engine, would be to disconnect the air filter to turbo intake hose and, using your fingers, see if the compressor wheel spins freely and can't be shoved over enough to cause binding.
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