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Oil in TBI unit..

Discussion in 'The Garage' started by SS66, Oct 28, 2006.

  1. SS66

    SS66 1/2 ton status

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    I went to take a look at my fuel injectors... I found something ugly when I removed that plate that allows you to get to them. There is a rubber hose running from the valve cover to the back of the tbi unit where the injectors are housed. Well there is a bunch of black stuff in there. This isnt carbon.. looks like OIL. I assume this is pretty bad..Its not pooling in there yet.. but there is a decent amount.. any ideas on what to do?

    Also.. how does one diagnose whether or not an injector is bad?

    Thanks
     
  2. ryoken

    ryoken Puppy Fabricator Premium Member GMOTM Winner

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    Blowby... Rings are tired or worse... Mileage?

    You can usually tell an injector is troubled by the spray pattern...
     
  3. randy88k5

    randy88k5 1/2 ton status

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    You can see the spray pattern from the injectors pretty well if you use a timing light. It will freeze the image making it easier to see the shape. It should have a nice uniform cone shape to it, and no large droplets of fuel.

    What problem are you having that makes you suspect the injectors?
     
  4. SS66

    SS66 1/2 ton status

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    Im smelling gas and it seems a bit sluggish. Im gonna replace the Oxygen sensor and fuel filter before I invest in new injectors to see if that helps..
     
  5. Thunder

    Thunder 3/4 ton status

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    Sounds like a lack of maintenance problem to me . Change or clean your PVC valve and replace the fuel filter.
     
  6. scooter122983

    scooter122983 1/2 ton status

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    Look at the conections, if there bad replace them, if they look like **** then replace them, if there 16 years old replace them. Use your head and common sense.
     
  7. btolenti

    btolenti 1/2 ton status

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    the vacuum line on the rear of the TBI should go to the MAP, not the valve cover....or am I mistaking which line you are talking about?!?!?!?! Or are you talking about the 1/2" line that goes to the air cleaner spacer ring????
     

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