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It probably wouldn't be a bad idea to have a spare injector on hand, whether you find a bad one this time or not, and that would seem to be a quick test to swap out with a new one and see if the smoke goes away. Considering the popularity of Bosch injection parts these days, you may even be able to find one locally at a NAPA or other parts store! When your Bentley manual arrives, or if you happen to have the factory manual, procedures for relieving fuel rail pressure, then removing the injector should be carefully followed!
There are probably a couple of ways you could test a suspected bad injector after you have removed it from the engine:
1. A regulated source of 33 psi compressed air could be plumbed to the injector ... any hissing or noticeable leaks are unacceptable!
2. An authorized Bosch 'service station' for fuel injection will be able to test the injector for static leaks and spray pattern.
An overnight stint in an ultrasonic cleaner in a carb./injector cleaner like B-12 Chemtool might loosen any internal contamination by rust, or particulates like Carbonates (white non-soluble compunds that can settle-out inside fuel injection systems in ALL THE WRONG PLACES) sometimes passed along by careless refinery or transport truck carriers.
Please NOTE: Any time the injectors on one side's fuel rail are taken loose, it would be a very good idea to replace all of the O-rings on those three injectors connecting to that fuel rail, and the bottom sealing O-ring of any injectors removed from their cylinder head!
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Warren Hall
1973 911S Targa
[This message has been edited by Early_S_Man (edited 08-29-2000).]
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