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Discussion Starter #1
My 66 Impala SS with 396 running Holley Sniper EFI throttle sticks from a stop. I had he same problem with the Edelbrock carb before I removed it. I have to press extra hard on the accelerator and the tires break loose at almost every stop. I have taken it all apart and cleaned and lubed the triangular hinge point bolted to the firewall and replaced the linkage from the rod at the firewall with tie rods and the rod to the throttle body with several different bends and lengths but nothing works. The pedal has a plastic lined area on the back which is in good shape and I have lubricated it with silicone lube with no success. I'm thinking maybe a LOKAR throttle assembly, however I prefer to keep it as stock as possible.
Any thoughts would be appreciated
 

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What is in front of the throttle arm looks good. See a lot of wires and vacuum hoses between throttle arm and fire wall but can not see if it is causing issues. Also check under the dash for a floor mat jamming the throttle pedal or a throttle pedal popping off the two pegs it rotates on. that will also gum up the works.

On second examination of the picture I have to ask are you connected to the throttle arm or the TH350 down shift arm? I can almost make out a Ford sized hole in the metal arm behind where you are connected now. If so you need a Holley bushing and stud kit to hook up your heim joint throttle linkage.

https://www.holley.com/products/fuel_systems/carburetor_components/brackets_and_linkage/parts/6026

https://www.holley.com/products/fuel_systems/carburetor_components/brackets_and_linkage/parts/20-64

Big Dave
 

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From your description, it sounds like things are bound up right from the get-go. Agree with Dave above that it kind of looks like a plug wire or 2 is in the path of that top part of the mechanical linkage at the firewall.
I do like the linkage you have from the firewall to the FI. Seems doubtful that is the issue since it's newer.

Can you feel the resistance by working things with your hand? Seem slike you should. I'd disconnect a bit at a time and keep feeling for it.
So hard to be of much help here without being right there with ya.
 

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Discussion Starter #4
Thanks Dave & BA,
There are no obstructions with the wires/vacuum lines or the carpet/or insulation on the interior. With the engine off there is slight resistance from off idle only, and with foot or hand pressure there is no problem in any of the other travel. Today I removed the assembly and reinstalled it in a slightly different configuration. I felt the action from under the car and could feel no issues. I could not drive it today as it is wet out, however I will try it ASAP.
The linkage is connected at the correct point on the TB as I went back through the installation instructions and found it to be correct.
I tried to attach that diagram, but my skills with a PC are evidently limited and I couldn't get the correct file extension to allow it.
 

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Discussion Starter #5
Well Dave / BA,
I drove the car today and NOOO Change. I have ordered a Throttle pedal assembly and cable. I'll let you know how it goes.
Thanks Again
 

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I remember my grandfather telling me that return springs need to have a little stretch even at full return as otherwise it takes a little more force to get them moving. Once they are moving they move smoothly. Also you might have a slightly heavier spring for the throttle than you really need.
 

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The answer is geometry. Your photo seems to show a six cylinder throttle rod at the firewall. Was your car originally a six? The V-8 rod rises straighter for a different "angle of attack" to pull the throttle easier. Where near Chicago do you live? I think I have a V-8 pedal linkage in my pile of "66 Stuff". I am in West Chicago. Ed
 

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We had the same problem on my BBC '66 Impala. We finally got it fixed by lengthening the linkage on the throttle body where the foot-feed rod hooks. We also moved the hole back in the extension a little more closer to the top of the ark of the movement. It will make pedal push EZer & is less sensitive. If you have any ? sent me your phone # & I will call you
 

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Discussion Starter #10
Thanks All,
Love the diagrams thanks - I believe it did have the 283 type from the looks, and I wish I knew what engine came in the car, the only thing I can learn from the cowl tag is 8 Cyl.. But I don't believe in 66 they came with a 396 BB. Probably 283 or 327.

Any way back to the throttle. I removed the mechanical linkage and installed a new bottom hinged pedal with a cable through the firewall and it works fine now.
 

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