Throttle Rod Position - Team Camaro Tech
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post #1 of 24 (permalink) Old Nov 24th, 05, 11:10 AM Thread Starter
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Matt
 
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Throttle Rod Position

1) What is the correct position of the throttle rod swivel? I noticed after having some work done on my car that they removed/replaced the throttle rod, first in the wrong position and later what I think is correct. When I drove out of the shop, my top speed when floored was 20mph - later realized they attached the rod in the wrong location. I also believe they adjusted the swivel while messing with it. Seems like when the accelerator is "floored" I don't get the accelaration I used to.




2) What is the effect of the accelerator return spring being stretched out - below is a pic of mine:



The pictures above are with the accelerator pedal in the normal position.

Matt
1968 RS Convertible, 327/275HP, Rochester 4bbl, PG Trany, non-a/c

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post #2 of 24 (permalink) Old Nov 24th, 05, 11:45 AM
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Re: Throttle Rod Position

Are you sure the lever arm was removed? It's a bear to get to with the motor in. Someone correct me if needed, but I think it is keyed and will only go on in the right position. When you floor the gas, the lever arm should nearly hit the firewall.
The stretched out return spring in the foreground is attached to the kickdown linkage for the t350 trans. It does look yucky. Been many years since I had a t350 and the kickdown wasn't attached on that one, so I'll leave it alone.





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post #3 of 24 (permalink) Old Nov 24th, 05, 11:59 AM
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Re: Throttle Rod Position

Matt,
It's easy enough to figure out. Take the pin out that holds it at the carb, have someone press the throttle pedal all the way to the floor, take the rod out of the carb and see if you can move the carb more. If you can, is not in the right place. It might have to go in one of the other holes. Take a minute and try moving it around and see what happens. Its a very simple mechanical system.

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post #4 of 24 (permalink) Old Nov 24th, 05, 12:00 PM
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Re: Throttle Rod Position

They may have put the rod on backwards. The threaded end should be at the carb. The way it is, it's very possible that the rod is hitting the firewall before WOT is achieved.

John
'67 SS/RS (RR)
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post #5 of 24 (permalink) Old Nov 24th, 05, 01:31 PM
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Re: Throttle Rod Position

Quote:
Originally Posted by Kyvox
They may have put the rod on backwards. The threaded end should be at the carb. The way it is, it's very possible that the rod is hitting the firewall before WOT is achieved.
Exactly my thought on this one... Matt reverse the rod and follow Bill's advice to check it for full throttle...

...Dennis

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post #6 of 24 (permalink) Old Nov 24th, 05, 03:32 PM Thread Starter
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Re: Throttle Rod Position

The lever arm was not removed, but the pin and rod removed then replaced in the hole location at the 2 o'clock position. Once it was placed into the 10 o'clock position (as shown) acceleration was MUCH better.

Quote:
The stretched out return spring in the foreground is attached to the kickdown linkage for the t350 trans.
That's funny, I don't have a T350 trans, but a PG - does that make a difference?

I'll try reversing the rod and checking for full throttle over the next couple days.

Matt
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post #7 of 24 (permalink) Old Nov 24th, 05, 08:12 PM
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Re: Throttle Rod Position

Your rod should still be reversed. Put the threaded end at the cab, as stated, not at the firewall.

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post #8 of 24 (permalink) Old Nov 25th, 05, 07:52 AM
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Re: Throttle Rod Position

Your PG rod setup looks normal, just the trans Kickdown spring did get stretched at one point, not the accel spring. It only keeps the kickdown rod tight against the ball thing on the carb.

I concur with the others on the accel rod. Thread end of rod goes on the carb side. If it didn't the rod end would hit the firewall before accell arm full motion (floored) was reached.

Here is my setup



Come to think of it, I need to move the carb side of rod to one of the upper holes to get more arc!

Kevin


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post #9 of 24 (permalink) Old Nov 25th, 05, 03:47 PM Thread Starter
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Re: Throttle Rod Position

OK, turned the throttle rod around so the threaded end is at the carb. I adjusted the swivel and adjusted as Bill suggested until the carb was open as far as possible with the pedal at the floor. However, when I started her up the idle speed was way too high. Adjusted the swivel back to the original location but no change in idle speed, even took the rod off completely but still idling way too high

Not sure what to do - only thing I adjusted was the swivel and turned the rod around.

On a side note: The 1968 Chevrolet Chasis Service Manual shows conflicting diagrams - Fig 8C (6M-6) shows the swivel at the carb for a Camaro 327 cu.in, then figure 11C (6M-9, V-8 Engine except 396 & 427) shows it on the opposite side.

Matt
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post #10 of 24 (permalink) Old Nov 25th, 05, 07:42 PM
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Re: Throttle Rod Position

After you turned it around-threads by carb-did you try adjusting the idle with the screw on the linkage? Also, if I remember right, the swivel part that goes into the linkage works better going in one side of the hole rather than the other side. Now I bet I screwed you up...I will go look. On mine, the rod part of the swivel points to the carb. And it is cold out there.
My linkage hooks to my carb opposite of the way yours is.

Last edited by deerhunter; Nov 25th, 05 at 07:45 PM. Reason: Picture number 2
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post #11 of 24 (permalink) Old Nov 25th, 05, 08:36 PM Thread Starter
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Re: Throttle Rod Position

Quote:
After you turned it around-threads by carb-did you try adjusting the idle with the screw on the linkage?
I think you are asking if I tried adjusting the idle by moving the swivel on the linkage? I did, so that when acc. pedal is to the floor it would open up the carb more, however the idle was way too high, so I changed it back. When I changed it back the idle speed remained too high - no clue why. I even disconnected the linkage at the carburetor and the idle is still too high. Have not made any adjustments to any of the idle screws...before or after.

Quote:
My linkage hooks to my carb opposite of the way yours is.
I noticed that too (from diagrams) but if I try to hook it up on the other side the swivel hits the bracket shown in my first pic (where the swivel is mounted incorrectly).

Through this whole process I noticed that the acc. arm hits the rod passing through the bracket as well...so my acc. pedal doesn't come back as far as it should - but it was always like that before any of the discussed idling issues. Should the acc. arm be that close to the bracket/manifold?

Matt
1968 RS Convertible, 327/275HP, Rochester 4bbl, PG Trany, non-a/c

"Don't mistake kindness for weakness."

Last edited by mattalin; Nov 26th, 05 at 09:43 AM.
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post #12 of 24 (permalink) Old Nov 25th, 05, 08:37 PM Thread Starter
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Re: Throttle Rod Position

Sorry, posted twice.

Matt
1968 RS Convertible, 327/275HP, Rochester 4bbl, PG Trany, non-a/c

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post #13 of 24 (permalink) Old Nov 26th, 05, 10:03 AM
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Re: Throttle Rod Position

Actually, I was wondering if you tried to adjust the idle using the idle adjustment screw. As far as the throttle rod, did you turn both ends to point toward the center of the block? If not, you might try that and then adjust the screw end for wide open throttle. If you get the high idle again, check all of the linkage to see if it is binding or hanging up on something. If everything is free, then you might have to start the tune up process. Try the idle adjustment screws on the front of the carb at a starting point of 1 1/2 turns out for each one. Also, check the timing. I just reread your post to help me recall what has been done. The idle adjustment screw should be between the threaded swivel part and the carb body. If it was idleing to high with the rod removed then someone has changed the idle screw and/or the idle mixture screws. I think you need to get the rod in right like the way that has been suggested and go to the idle adjustment screw to set it.
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post #14 of 24 (permalink) Old Nov 26th, 05, 01:26 PM
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Re: Throttle Rod Position

Since you're starting the engine cold, the choke could be closed, and the carb linkage is on the fast idle cam. How many RPM are we talking about at idle? (1000?, 2000?, 3000?)

John
'67 SS/RS (RR)
'68 RS conv. (J2)
'68 Z/28 (VV)
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post #15 of 24 (permalink) Old Nov 26th, 05, 08:38 PM Thread Starter
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Re: Throttle Rod Position

Don't know precisely, but I'd estimate at least 2000 RPM at idle.

Matt
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