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    Results 21 to 40 of 47
    1. #21
      Join Date
      Dec 2014
      Location
      Murfreesboro, Tennessee
      Posts
      134
      Country Flag: United States
      Installed the filter and made things worse.

      1971 Firebird Formula 455HO 6 speed
      2017 GMC Sierra Denali Ultimate Pearl White 6.2L
      2013 GMC Sierra 5.3 6 Speed Pearl White, SLP 1.9L Supercharger(Sold)

    2. #22
      Join Date
      Nov 2006
      Location
      Mountain Springs, Texas
      Posts
      4,488
      Country Flag: United States
      Quote Originally Posted by 71LS5Formula View Post
      Installed the filter and made things worse.
      Can you tell us which wire was connected to what.

      Should have been red wire to tach signal output on distributor, yellow to Fitech tach signal input and your tachometer, black to engine ground. Would be worth trying with and without your tachometer connected.

      Do you have an ohmmeter? Could you measure the resistance between the red and yellow wires and the red and black wires with the filter not connected to anything.

      Could you post a pic of your distributor and the wires to the Fitech unit.

      Thanks,
      Don
      1969 Camaro - LSA 6L90E AME sub/IRS
      1957 Buick Estate Wagon
      1959 El Camino - Ironworks frame
      1956 Cameo - full C5 suspension/drivetrain
      1959 Apache Fleetside

    3. #23
      Join Date
      Dec 2014
      Location
      Murfreesboro, Tennessee
      Posts
      134
      Country Flag: United States
      Red wire from distributor, yellow out to efi and tach and black ground.

      1971 Firebird Formula 455HO 6 speed
      2017 GMC Sierra Denali Ultimate Pearl White 6.2L
      2013 GMC Sierra 5.3 6 Speed Pearl White, SLP 1.9L Supercharger(Sold)

    4. #24
      Join Date
      Nov 2006
      Location
      Mountain Springs, Texas
      Posts
      4,488
      Country Flag: United States
      Quote Originally Posted by 71LS5Formula View Post
      Red wire from distributor, yellow out to efi and tach and black ground.
      Could you try it without the tach connected.

      Thanks,
      Don
      1969 Camaro - LSA 6L90E AME sub/IRS
      1957 Buick Estate Wagon
      1959 El Camino - Ironworks frame
      1956 Cameo - full C5 suspension/drivetrain
      1959 Apache Fleetside

    5. #25
      Join Date
      Dec 2014
      Location
      Murfreesboro, Tennessee
      Posts
      134
      Country Flag: United States
      I have before i installed the filter and the same results.

      1971 Firebird Formula 455HO 6 speed
      2017 GMC Sierra Denali Ultimate Pearl White 6.2L
      2013 GMC Sierra 5.3 6 Speed Pearl White, SLP 1.9L Supercharger(Sold)

    6. #26
      Join Date
      Dec 2014
      Location
      Murfreesboro, Tennessee
      Posts
      134
      Country Flag: United States
      Could bad plugs cause this issue?

      1971 Firebird Formula 455HO 6 speed
      2017 GMC Sierra Denali Ultimate Pearl White 6.2L
      2013 GMC Sierra 5.3 6 Speed Pearl White, SLP 1.9L Supercharger(Sold)

    7. #27
      Join Date
      Nov 2006
      Location
      Mountain Springs, Texas
      Posts
      4,488
      Country Flag: United States
      Since the problem gets worse at hot I would not guess the plugs but I guess you never know. Next thing I would try would be to add an insulating spacer between the intake and throttle body to reduce the temperature of the electronics in the throttle body.

      I don't know if you have room for something like this:

      http://www.ebay.com/itm/66-72-Chevro...72.m2749.l2649

      Or maybe something like this:

      http://www.ebay.com/itm/Carb-Carbure...dXD84g&vxp=mtr

      A quick test to see if it would help would be to hit the electronics part of the throttle body with freeze spray to see if the problem disappears.

      Would be good if you could post some pics of your setup.

      Don
      1969 Camaro - LSA 6L90E AME sub/IRS
      1957 Buick Estate Wagon
      1959 El Camino - Ironworks frame
      1956 Cameo - full C5 suspension/drivetrain
      1959 Apache Fleetside

    8. #28
      Join Date
      Dec 2014
      Location
      Murfreesboro, Tennessee
      Posts
      134
      Country Flag: United States
      Can't use any spacers. Not enough room.

      1971 Firebird Formula 455HO 6 speed
      2017 GMC Sierra Denali Ultimate Pearl White 6.2L
      2013 GMC Sierra 5.3 6 Speed Pearl White, SLP 1.9L Supercharger(Sold)

    9. #29
      Join Date
      Nov 2006
      Location
      Mountain Springs, Texas
      Posts
      4,488
      Country Flag: United States
      Quote Originally Posted by 71LS5Formula View Post
      Can't use any spacers. Not enough room.
      What about the first one, it doesn't add much height at all.

      Don
      1969 Camaro - LSA 6L90E AME sub/IRS
      1957 Buick Estate Wagon
      1959 El Camino - Ironworks frame
      1956 Cameo - full C5 suspension/drivetrain
      1959 Apache Fleetside

    10. #30
      Join Date
      Dec 2014
      Location
      Murfreesboro, Tennessee
      Posts
      134
      Country Flag: United States
      running a Pontiac 455 with the factory intake and ram air breather pan.

      1971 Firebird Formula 455HO 6 speed
      2017 GMC Sierra Denali Ultimate Pearl White 6.2L
      2013 GMC Sierra 5.3 6 Speed Pearl White, SLP 1.9L Supercharger(Sold)

    11. #31
      Join Date
      Nov 2006
      Location
      Mountain Springs, Texas
      Posts
      4,488
      Country Flag: United States
      If the Fitech throttle body fits I would have thought the first one could be made to fit. Sorry other than the other things I suggested above I am out of suggestions.

      Is the heat passage under the throttle body plugged in the intake manifold gasket?

      Don
      1969 Camaro - LSA 6L90E AME sub/IRS
      1957 Buick Estate Wagon
      1959 El Camino - Ironworks frame
      1956 Cameo - full C5 suspension/drivetrain
      1959 Apache Fleetside

    12. #32
      Join Date
      Dec 2014
      Location
      Murfreesboro, Tennessee
      Posts
      134
      Country Flag: United States
      No need to be sorry. Thank you for the advice that you have given. I'm gonna try plugs tomorrow. I did put a new control module in and coil.


      1971 Firebird Formula 455HO 6 speed
      2017 GMC Sierra Denali Ultimate Pearl White 6.2L
      2013 GMC Sierra 5.3 6 Speed Pearl White, SLP 1.9L Supercharger(Sold)


    13. #33
      Join Date
      Nov 2006
      Location
      Mountain Springs, Texas
      Posts
      4,488
      Country Flag: United States
      I think you need to lower the temperature of that throttle body somehow.

      Don
      1969 Camaro - LSA 6L90E AME sub/IRS
      1957 Buick Estate Wagon
      1959 El Camino - Ironworks frame
      1956 Cameo - full C5 suspension/drivetrain
      1959 Apache Fleetside

    14. #34
      Join Date
      Dec 2014
      Location
      Murfreesboro, Tennessee
      Posts
      134
      Country Flag: United States
      right now as I'm trying to figure things out the hood is open and breather pan is off.

      1971 Firebird Formula 455HO 6 speed
      2017 GMC Sierra Denali Ultimate Pearl White 6.2L
      2013 GMC Sierra 5.3 6 Speed Pearl White, SLP 1.9L Supercharger(Sold)

    15. #35
      Join Date
      Nov 2006
      Location
      Mountain Springs, Texas
      Posts
      4,488
      Country Flag: United States
      What is the thermostat temperature? 180? If that thermal passage is open under the throttle body it will be heating it up. What about shooting the throttle body with compressed air to cool it to see if things improve?
      1969 Camaro - LSA 6L90E AME sub/IRS
      1957 Buick Estate Wagon
      1959 El Camino - Ironworks frame
      1956 Cameo - full C5 suspension/drivetrain
      1959 Apache Fleetside

    16. #36
      Join Date
      Dec 2014
      Location
      Murfreesboro, Tennessee
      Posts
      134
      Country Flag: United States
      160 degree thermostat. Aluminum intake. I think i need to try another distributor to eliminate it, but i don't have one.

      1971 Firebird Formula 455HO 6 speed
      2017 GMC Sierra Denali Ultimate Pearl White 6.2L
      2013 GMC Sierra 5.3 6 Speed Pearl White, SLP 1.9L Supercharger(Sold)

    17. #37
      Join Date
      Nov 2006
      Location
      Mountain Springs, Texas
      Posts
      4,488
      Country Flag: United States
      One more question. Mechanical or electric fans?

      Don
      1969 Camaro - LSA 6L90E AME sub/IRS
      1957 Buick Estate Wagon
      1959 El Camino - Ironworks frame
      1956 Cameo - full C5 suspension/drivetrain
      1959 Apache Fleetside

    18. #38
      Join Date
      Dec 2014
      Location
      Murfreesboro, Tennessee
      Posts
      134
      Country Flag: United States
      Mechanical clutch

      1971 Firebird Formula 455HO 6 speed
      2017 GMC Sierra Denali Ultimate Pearl White 6.2L
      2013 GMC Sierra 5.3 6 Speed Pearl White, SLP 1.9L Supercharger(Sold)

    19. #39
      Join Date
      Dec 2014
      Location
      Murfreesboro, Tennessee
      Posts
      134
      Country Flag: United States
      Riddle me this. Riddle me that. Why would disconnecting the vacuum advance correct my problems?

      1971 Firebird Formula 455HO 6 speed
      2017 GMC Sierra Denali Ultimate Pearl White 6.2L
      2013 GMC Sierra 5.3 6 Speed Pearl White, SLP 1.9L Supercharger(Sold)

    20. #40
      Join Date
      Nov 2006
      Location
      Mountain Springs, Texas
      Posts
      4,488
      Country Flag: United States
      No idea. Does it go away as soon as you disconnect the vacuum advance? Or does it take a while?

      Don
      1969 Camaro - LSA 6L90E AME sub/IRS
      1957 Buick Estate Wagon
      1959 El Camino - Ironworks frame
      1956 Cameo - full C5 suspension/drivetrain
      1959 Apache Fleetside

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