Sticky Throttle Cable...Adjustment too tight ?

Tynan918

Royal Smart Person
Aug 2, 2021
1,120
63
Edelbrock 1902 AVS2 500CFM carburetor...

My throttle cable keeps sticking and staying stuck after acceleration and taking my foot off of the gas pedal.

I have to use my hand to press it back down into the correct position to keep it from revving too high in Park...

I have new return springs at the front of the engine to pull the carburetor throttle linkage place...the smaller spring goes in the fatter spring and they both connect from the return bracket at the front of the manifold to the carburetor throttle linkage...but I only use the smaller spring because the fat spring gets caught on the idle screw when I let off the gas pedal. I assume the smaller spring isn't strong enough to pull against the too tight throttle cable...

New carburetor so I don't see how it could be the carburetor, unless the butterflies are getting caught at the intake, but this issue doesn't happen until I connect my throttle cable to the carburetor throttle linkage...

I'm told while adjusting the throttle cable, to pull the cable towards the front of the motor until it stops, adjust the bracket until it reaches the carburetor throttle linkage, and it should be "piano string tight" when I'm finished...

But it seems to be pulling the carburetor throttle linkage back and keeping it there after I accelerate and left off the gas pedal...

At idle, my RPMs are 750 but if I cruise and park it, the RPMs are at 1,000-1,200 RPMs and if I shut the engine off during that high idle, the engine stumbles to shut down for a couple of seconds instead of just shutting off...(which could also be caused by my 9 PSI way too high fuel pump pressure...)

I strongly believe my throttle is misadjusted and it's too tight...Am I adjusting this throttle cable correctly or is it what's causing the "sticky" throttle linkage ?
 

scoti

Royal Smart Person
Supporting Member
Sep 5, 2019
1,689
113
Texas
1. Try going slightly looser on the throttle cable.
2. Both throttle return springs are needed. Re-attach the 2nd spring in an orientation that doesn't catch on the idle screw.
 
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Tynan918

Royal Smart Person
Thread starter
Aug 2, 2021
1,120
63
2. Both throttle return springs are needed. Re-attach the 2nd spring in an orientation that doesn't catch on the idle screw.
I've tried just about every orientation possible... I only have these two points on the throttle linkage to connect to (circled in red). Whether I connect the springs on the front side or backside of these holes, the fat spring catches on the idle screw...

I'm not at my car at the moment, but will be soon and I will play with the spring orientation and shoot and share videos.
Screenshot_20220628-112503-673.png
 

scoti

Royal Smart Person
Supporting Member
Sep 5, 2019
1,689
113
Texas
Put the picture up again but circle where the idle screw is in relation to those two holes.
 
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airboatgreg

Comic Book Super Hero
Oct 2, 2016
2,779
113
Loosen the carb and properly torque the bolts. Make sure you have the right base gasket
 
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SSMonteMan

Greasemonkey
Jun 12, 2015
110
43
You might need to buy or make a bracket that hold the throttle return spring up above the idle screw.

This is what I used when I went to a holley carb: https://www.summitracing.com/parts/sum-210239blk

It has the throttle bracket and return spring holder, botu adjustable, and it holds it up above all the linkage. No interference,no binding.
 
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Tynan918

Royal Smart Person
Thread starter
Aug 2, 2021
1,120
63
You might need to buy or make a bracket that hold the throttle return spring up above the idle screw.

This is what I used when I went to a holley carb: https://www.summitracing.com/parts/sum-210239blk

It has the throttle bracket and return spring holder, botu adjustable, and it holds it up above all the linkage. No interference,no binding.
I found my old double spring set and it works a lot better. I think the too high fuel pressure is causing my idling to be off...

I have a little bit of engine stumble and I can't get rid of it and I'm sure that it's being caused by the fuel pressure being too high.. I can't set the air and fuel ratio correctly if the fuel pressure is too high...

I can damn near takeout the idle mixture screws and it will run still, and of course if I take it out it stumbles and stalls but not until I actually take it out.

Hopefully when I get the fuel pressure regulator and bring down the fuel pressure I will be able to set the idle mixture screws correctly with effect.
 

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