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Q:

What do I have to remove to install a fuel injector on # 1 cylinder? on 1993 Infiniti J30

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It was diagnosed with a failed injector on # 1 cylinder
(1) Answer
The upper intake manifold comes off, the injectors and fuel rail come off as an assembly. Replace the injectors you need to replace; replace o-rings on all.

If you have not done this job before, have a pro give you guidance. You would not want to make a mistake here with the volatility of fuel components.