Question about 1997 GMC Sierra

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I need to replace the #4 fuel injector. Please

I (may) need to replace the #4 fuel injector. Please describe procedure and advise of anything to watch out for.Plus, any advise for easy tests to verify that this is the problem? It is missing on #4 according to garage that checked codes.

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  • kdewald Nov 18, 2009

    Hi, Thanks,

    it is the 5.7 vortec and evidently the injector assemglies are all held by a bracket and have a squeeze connector at the end of a tube connected to the injector itself.


  • kdewald Nov 19, 2009




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I do not know witch engine you have,but ,I imagine shop checked the coil,wire ,and plug,,look for a valve,with a valve core in it,and depress the core to relieve the fuel pressure before you start.There will be bolts in the fuel rail,holding the fuel rail to the intake.Remove these bolts,all of them.To remove the one injector,you need to remove all,at the same time,Do not remove the injectors from the rail.Pry gently between the injector,and the intake with a pry bar,and twist and turn on the injector to remove.When you go to replace the one,just remove the c-clip and remove from the rail,that you have removed already.Install in opposite,replace all the o rings on all the injectors,between the intake and injector,and use vasoline on the outside of the o ring,to help with the reinstall.You will have to twist and puss on the injectors to put them back in the intake.

Posted on Nov 18, 2009

  • 1 more comment 
  • Ronny Bennett Sr.
    Ronny Bennett Sr. Nov 18, 2009

    If it is a 4.3,vortec,then he injectors will come out different ly by just sqeezing the plastic connector together,and pulling,and all injectors would not have too come out.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Nov 18, 2009

    Just sqeeze the connector and pull it out,and replace it,but I would still you vasoline to lube the o ring on the new one.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Nov 18, 2009

    Purchase the injector,and you will see how it connects to the spider.



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