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#1
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Hi Guys,
Having a little problem with my throttle travel. Stock linkage with cable, original 7028265 Rochester carb. Pedal to floor only opens secondaries about 2/3 of the way. If I remove cable at carb I can easily open throttle to full position. Stock (new) cable has no adjustments and if I start bending things the idle will be too high. Your thoughts? Greg |
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#2
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Could it be the "sleeve" on the cable touching the "collar" when you're approaching full throttle ? Maybe you could take a look while someone's in the car pushing the pedal ? This looks like an aftermarket cable, is it ?
Last edited by frankyboy455; 02-08-2015 at 08:29 PM. |
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#3
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Cable is correct for the car. Moves freely and does not hit or bind at the collar. I think I may need to bend the lower part of the pedal assembly upward.
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#4
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If it will go WOT with cable connected at carb, when you pull it all the way back by hand, then yes you may have the lower gas pedal rod bent. Make sure to adjust it when the pedal hits the floor, you are at WOT. You dont want the carb to hit WOT and have a gap between the pedal and the floor, that's how linkages get bent or cables broken.
Last edited by TedRamAirII; 02-08-2015 at 09:57 PM. |
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#5
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Good advice TedRamAirII. Too many guys make the mistake of having the carb wide open with the pedal or linkage not fully bottomed. Broken parts follow--especially the throttle cable and carb throttle arm.
__________________
BONESTOCK GOATS '64 GTO Tripower Hardtop (Wife's Car) '64 GTO Tripower Post Coupe (My Car) '99 Bonneville SE Sedan |
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#6
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Also check to see that you don't have too much padding and carpet under the gas pedal as this will prevent the pedal from going all the way down.
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#7
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I had to remove my pedal and bend it into shape to get WOT. Hardest part is getting that darn C-clip off.
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#8
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7 out of 9 of the first Gen birds I worked on needed pedal modifications to obtain full throttle. On one I used bronze bushings at the pivot. Helped take away a lot of slop associated with the plastic one.
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#9
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Re-bent the lower gas pedal rod, works fine now. Thanks guys.
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#10
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The end of the throttle cable that connect to the gas pedal, I place a small lead fishing slip sinker on it to take up a little slop and that worked to open my throttle all the way open.
__________________
68 400 HO 4sp Convertible Firebird400HO.com My 68 firebird 400 HO convertible Restoration Gallery |
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#11
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Hmmm I may have this problem too. I've tested WOT by having the wife sit in the car and press the pedal to the floor but always seems like when I reach in I can still turn the throttle back just a little bit more. I put an aftermarket adjustable cable (another long story) on it and have adjusted it 3 or 4 times. Pedal has always felt a little sloppy too. May have to take it out, replace bushings and see if it needs to be bent.
Is the pedal arm repro'd? The one in my car looks weird, not sure if its just the way the factory made them this way or not but at first glance looks like a piece at the end was remove but looking close also looks like it may have just come that way. I'll post a pic later.
__________________
Jimmy www.firebirdgallery.com 2002 WS6 M6 Trans Am - original owner 1973 Trans Am 455/4-speed 1971 Formula 400/400 1969 GTO 400/400 - 3rd owner 1968 Firebird Convertible 350/200R4 POCI - AAC |
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#12
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All the 1st gen birds were made so the carb didn't open all the way up on purpose. Thats why the bird had a HP rating of 335 HP & the GO had a 366 HP rating. Pontiac had a 10 HP rat per lbs rule & they did that so the bird didn't have the bigger HP because of the lesser weight of the bird. All it took was to bend the throttle bracket a bit to correct it & then the bird would have the 366 HP rating because the carb would then open all the way up. But it was done on purpose.
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