Gas Pedal Sticking.... - Team Camaro Tech
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post #1 of 20 (permalink) Old Feb 13th, 07, 05:01 PM Thread Starter
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Gas Pedal Sticking....

Just swapped in a 406 in the Camaro. I was running a 327 with an Edelbrock 1405 (I think), now running a Holley 4150 double pumper. I figured out where the piece on the threaded rod should be at WOT, but now my pedal pushes down and won't return. It feels like there is something restricting the pedal back to the correct height. I checked for plug wires/brake booster vac. lines in the way and couldn't see anything that would cause this to happen... I did notice a bolt that was a bit loose where the linkage by the firewall meets the rod for the gas pedal. I snugged it in, but no change... Any ideas???
Thanks-Dano

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post #2 of 20 (permalink) Old Feb 13th, 07, 05:10 PM
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Re: Gas Pedal Sticking....

check for interference with the air cleaner housing.

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post #3 of 20 (permalink) Old Feb 13th, 07, 05:50 PM Thread Starter
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Re: Gas Pedal Sticking....

The air cleaner sits a ways above the throttle mechanism on the carb. I DID notice that the return spring is a bit wimpy though. When I disconnect the threaded rod from the firewall linkage piece the pedal is "floppy" (no resistance) As soon as I hook up the rod to the carb the pedal pushes down then won't come back up and it felels like it is being wedged somehow... I wouldn't think that a spring would have to have pounds of pressure to return a pedal?!
Dano

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post #4 of 20 (permalink) Old Feb 13th, 07, 06:16 PM
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Re: Gas Pedal Sticking....

take it loose at the carb and grab the throttle(on the carb), does the throttle at the carb still stick? Are the butterflies the culprit, or is it the throttle rod pulling the throttle over-center?
just guessin' of course.....

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post #5 of 20 (permalink) Old Feb 13th, 07, 06:19 PM
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Re: Gas Pedal Sticking....

Dan, thats a tough one to diagnose without seeing. I'd take the spring off and manually move it through its range of motion at the carb, check for any tightness or binding, then if you find nothing put the spring on and do it again. You may need the wife to push on the gas pedal as you watch things move, you just need to eyeball everything as it works.
I've seen the spring drag on the linkage of the carb at full throttle if its mounted too low at the stationary end (oposite of the linkage), that might do it, but you can bet it's somehow connected to the new carb unless the linkage at the firewall got bent during the engine swap.
You don't need crazy spring pressure, but it should be decent but not too heavy at the pedal for comfort, and a double spring for safety.

Sean

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post #6 of 20 (permalink) Old Feb 13th, 07, 07:30 PM
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Re: Gas Pedal Sticking....

Dan check for the alignment between the carb and the arm on the fire wall. Holley equipped small block 1st gens (Z/28) got a bent throttle rod where a Quadrajet got a straighter rod.

Holley:


Quad:


and the typical one I see used that can really bind sometimes...


...Dennis

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post #7 of 20 (permalink) Old Feb 13th, 07, 07:49 PM Thread Starter
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Re: Gas Pedal Sticking....

You guys are great! Dennis, I have the infamous 'straight rod syndrome' lol
I will look into binding issues at the threaded rod. It sorta felt like binding or wedging at the pedal. Also, I need the throttle rod to have about 1/4"+ more threaded area to move the attaching do-hickey even further down... Thanks for the clues. I read some of your past postings on this and still couldn't find it, but the rod must be the culprit.... I'll post back what I find out on it..
Thanks-Dano

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post #8 of 20 (permalink) Old Feb 13th, 07, 07:51 PM
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Re: Gas Pedal Sticking....

When i replaced my heater core the the cables rubed on the throttle cable/rod inside of the car. It's someplace to look.
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post #9 of 20 (permalink) Old Feb 13th, 07, 09:22 PM
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Re: Gas Pedal Sticking....

Definately check that, but thats the rod I use with good results, so I guess you just never know.

Sean

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post #10 of 20 (permalink) Old Feb 14th, 07, 07:54 AM
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Re: Gas Pedal Sticking....

Another thing to check is the plastic bushing that bolts to the firewall - the gas pedal rod passes through it. These are not that tough to break, esp when installing an engine. Shine a light down there and have a look. Mine broke last year. Kind of a pain to replace, but do-able with the motor in the car. You might also check to see if the pedal or rod is hanging up on the carpeting or somewhere else under the dash.


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post #11 of 20 (permalink) Old Feb 14th, 07, 09:11 AM
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Re: Gas Pedal Sticking....

check your motor mounts too!
a bad mount will make the linkage stick before it lets go and then youll have a stuck full throttle!


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post #12 of 20 (permalink) Old Feb 14th, 07, 03:57 PM
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Re: Gas Pedal Sticking....

What about the small bolt that connects the throttle actuator to the rod. It goes through the part where the actuator is folded in two and the bolt clamps the actuator to the throttle pedal rod where it protrudes from the plastic bushing. If the bolt is installed upside down or something it may be interfering with the firwall or the bushing causing it to hang up.

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post #13 of 20 (permalink) Old Feb 14th, 07, 08:56 PM Thread Starter
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Re: Gas Pedal Sticking....

Well, I tried to operate the pedal with different pieces of linkage disconnected and it seems like the pedal is fine with the threaded rod disconnected from the carb, but as soon as I attach it, the binding occurs. I am going to buy a bracket and cable system from Jegs or Summit and see if that helps. If NOT, then it's off to Pull a part and I'll grab a few different types of linkage rods and try those... Thanks for all the suggestions guys, I really appreciate it!
Dano

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post #14 of 20 (permalink) Old Feb 15th, 07, 03:55 AM
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Re: Gas Pedal Sticking....

Make sure the ends of the rod, the stubs going into the linkage and pedal are parallel to each other. You may have bend the rod to keep these ends parallel.

The return spring should pull back the throttle and the spring should be perpendicular to the throttle shaft. It should not be at an angle, as this would pull the throttle askew and the throttle plates would bind in the bores.

Good luck & happy hunting.

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post #15 of 20 (permalink) Old Feb 15th, 07, 05:03 PM Thread Starter
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Re: Gas Pedal Sticking....

Found the problem!.... Looks like the pedal rod broke off where it meets the firewall linkage piece. I smell a new Lokar pedal and cable system in the near future for me.lol Thanks for all the help guys!!
Dano
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