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does it still have the original Siemens relays? first thing I'd do is replace every one of them.
When I got my Centauro, it had been sitting in a dealer's shop for a couple of years. As is pretty common, it didn't run that smooth. After a different chip, it ran better. Two years ago it started to run really bad on one of the cylinders. I pulled the injectors and sent them to Mr. Injector http://www.mrinjector.us/. When I got them back, both were partially plugged with one only flowing about 60%. I replaced them and now it runs like a charm. I just rode it today and it's as smooth as you can expect from a "Beast".
Karl, just to be sure -- the small spigot on the pressure relief valve is open to air? Nobody attached a hose to it or plugged it?Have you been able to verify fuel pressure? The pump can work but not get the rail up to pressure.Have you tried a shot of ether (starting fluid) in the TBs? That would tell for sure that it's a fuel delivery thing (although not why).The injectors should click when they fire.Someone mentioned the sensors might be dirty. If this is a P8 injection you have two critical sensors -- one on the cam and one on the flywheel. The flywheel one in particular can get crudded up. That will affect timing and injector pulse duration.I'm mentioning all of this because pulling the injectors can make you say more bad words than checking these things will. :)
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