just listening about the diagnostic for TDI. Much more likely issue, for poor starting, rather than compression, is simply the Glow Plug computer, solenoid or glow plug controller. A very simple first check should be to make sure the glow plugs are getting juice! I’ve been know to bypass a bad computer, with a simple push button that actives the glow plug selonoid Just don’t hold the button too long ! -john
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