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Thread: 71 firebird ground issues
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09-26-2017 #41
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- Murfreesboro, Tennessee
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Everything clears up. Turned the car off and hooked it back up. Problem started immediately. I'm gonna try a different port from the factory spot to the back off the throttle body and see what happens.
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)
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09-26-2017 #42
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Only thing I can guess is that maybe you are running too much total advance but I don't know enough about the Fitech system.
Don1969 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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09-26-2017 #43
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I don't think that's the issue since its happening at idle.
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)
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09-27-2017 #44
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With the advance disconnected advance the timing and see if it happens.
Don1969 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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09-27-2017 #45
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- Dec 2014
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- Murfreesboro, Tennessee
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I think its the location of the of my vacuum port for it. The factory has it in one of the intakes runners, so it gets vacuum from just one cylinder and its causing to much fluctuation. I'm gonna try one of the ports on the throttle body today.
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)
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09-27-2017 #46
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- Nov 2006
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- Mountain Springs, Texas
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Maybe it is a ported versus manifold vacuum source issue. Ported would give less advance at idle since the source is before the throttle blades.
Don1969 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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09-28-2017 #47
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- Dec 2014
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- Murfreesboro, Tennessee
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- 134
Went to the port on the throttle body and almost the same results. So either the vacuum advance is bad or the weights and springs are not right.
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)
-
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