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Injector's

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by blazer72, Jan 7, 2001.

  1. blazer72

    blazer72 1/2 ton status

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    Injector\'s

    Last summer and this fall the #4 plug has been fuel fouling at low 4 wheel RPMS To night I pulled the injector and fond that it does not seal and lets 50 PSI air flow though it! Is there any way to clean and injector! There are some places that get like 25 each to do this. I can help but wounder if its not better to just replace it.

    I understand the jeep thing I drive a BLAZER!!

    Ken
     
  2. HarryH3

    HarryH3 1 ton status Author

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    Re: Injector\'s

    Try testing the leak rate a 10 PSI. The GM throttle body injectors operate in the 7-13 psi range. 50 PSI may be just blowing the valve off its seat. 3M makes an injector cleaning kit that works pretty well, but it isn't cheap. Around $80 last I knew. You run a mixture of really nasty solvents through the injectors with the kit. It may take a bit of searching to find one. I don't think they sell the kit at the corner parts store.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
     
  3. HarryH3

    HarryH3 1 ton status Author

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    Re: Injector\'s

    Hmm, just looked at your post again. You don't mention if it's a TBI or TPI system. If it's TPI, you can get a new injector for around $50. The 3M injector cleaning kit will also work on TPI systems.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
     
  4. realsquash

    realsquash 1/2 ton status

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    Re: Injector\'s

    FYI, those Rochester injectors can take up to about 60 psi during normal operation. Actually, in 1995 trucks they operated at 45psi IIRC.

    Squash
    <A target="_blank" HREF=http://www.trailrunners4x4.org/users/realsquash>http://www.trailrunners4x4.org/users/realsquash</A>
     
  5. blazer72

    blazer72 1/2 ton status

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    Re: Injector\'s

    Its TPI so at 50psi it should hold. I found a place that back flushes them, cleans them and replaces the screen, o-rings all for 10.00 each. The are not GM injectors. I run a 406 sb with aftermarket TPI The injectors are rated at 31lbs per hour at 43.3 psi on the fuel. This one is flowing pretty good when it should be closed! A replacment is about 75 to 80 each!

    I understand the jeep thing I drive a BLAZER!!

    Ken
     

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