| Super heavy accelerator pedal: how to fix this? [message #99572] |
Mon, 13 September 2010 10:59  |
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Since I've had my coach its always had a super heavy accelerator pedal. it looks like the PO added an extra return spring on the carb linkage to get the throttle to close. well when I added my new carb I also left the spring on. but now im noticing that the actuator rod on the gas pedal itself is taking a set and when I step on it it bearly opens the throttle unless I reach down and grab the pedal and bend it back up, this is only a temp fix as it grabs a set again. now I know that doing this this eventually will weaken the metal and the rod will break. so what is a way I can fix my accelerator problems, it seems there may also b som binding in the cable perhaps? maybe this is why the PO added the heavy spring to it?
thoughts and suggestions?
73 Canyon Lands, (a.k.a. The Yellow Submarine) West Los Angeles CA
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| Re: [GMCnet] Super heavy accelerator pedal: how to fix this? [message #99580 is a reply to message #99576] |
Mon, 13 September 2010 11:15  |
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James,
its not geting stuck open thats the problem , its a new Holley thats on there, but I had this issue with the old Q-jet too, its getting the throttle to open that is becoming the issue. its simply taking too much force to open the gas, when I stomp my foot to the floor throttle opens maybe 20%? I cant gt my vac gauge below 15 in unless I pry the pedal back up from the floor.
as for a runaway, if you keep your wits, just shift to neutral and apply brakes.if the engine might over speed u can switch it off, the vac booster will still stop ya, ive had that interesting experince before in another old vehicle.
| James Hupy wrote on Mon, 13 September 2010 11:05 |
My advice is to fix it before driving it much more. Trying to stop a 12000#
vehicle with the throttle stuck wide open has never held much appeal for me.
Yes those cable throttles do become bound and sticky and linkages do bind
up. Be sure to disconnect everything from the actual carb levers and make
sure that the throttle shafts are not the guilty party.
Jim Hupy
Salem, Or
78 Royale 403
On Mon, Sep 13, 2010 at 8:59 AM, Shan Rose <defconfx@gmail.com> wrote:
>
>
> Since I've had my coach its always had a super heavy accelerator pedal. it
> looks like the PO added an extra return spring on the carb linkage to get
> the throttle to close. well when I added my new carb I also left the spring
> on. but now im noticing that the actuator rod on the gas pedal itself is
> taking a set and when I step on it it bearly opens the throttle unless I
> reach down and grab the pedal and bend it back up, this is only a temp fix
> as it grabs a set again. now I know that doing this this eventually will
> weaken the metal and the rod will break. so what is a way I can fix my
> accelerator problems, it seems there may also b som binding in the cable
> perhaps? maybe this is why the PO added the heavy spring to it?
>
> thoughts and suggestions?
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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73 Canyon Lands, (a.k.a. The Yellow Submarine) West Los Angeles CA
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| Re: Super heavy accelerator pedal: how to fix this? [message #99586 is a reply to message #99572] |
Mon, 13 September 2010 12:06 |
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| Duce Apocalypse wrote on Mon, 13 September 2010 11:59 |
Since I've had my coach its always had a super heavy accelerator pedal. it looks like the PO added an extra return spring on the carb linkage to get the throttle to close. well when I added my new carb I also left the spring on. but now im noticing that the actuator rod on the gas pedal itself is taking a set and when I step on it it bearly opens the throttle unless I reach down and grab the pedal and bend it back up, this is only a temp fix as it grabs a set again. now I know that doing this this eventually will weaken the metal and the rod will break. so what is a way I can fix my accelerator problems, it seems there may also b som binding in the cable perhaps? maybe this is why the PO added the heavy spring to it?
thoughts and suggestions?
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Mine was similar and I ended up replacing the throttle cable with a new one and that helped quite a bit. I have a Holley on mine also. I got a new cable for a GMC van (I believe it was) it is a little shorter then the original but very easy to make work.
Hope that helps.
Bob & Terry Stockholm
Xenia, OH
1976 PB
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| Re: Super heavy accelerator pedal: how to fix this? [message #99587 is a reply to message #99586] |
Mon, 13 September 2010 12:22 |
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Bob do you have a part number by any chance?
| stkhlm wrote on Mon, 13 September 2010 12:06 |
| Duce Apocalypse wrote on Mon, 13 September 2010 11:59 |
Since I've had my coach its always had a super heavy accelerator pedal. it looks like the PO added an extra return spring on the carb linkage to get the throttle to close. well when I added my new carb I also left the spring on. but now im noticing that the actuator rod on the gas pedal itself is taking a set and when I step on it it bearly opens the throttle unless I reach down and grab the pedal and bend it back up, this is only a temp fix as it grabs a set again. now I know that doing this this eventually will weaken the metal and the rod will break. so what is a way I can fix my accelerator problems, it seems there may also b som binding in the cable perhaps? maybe this is why the PO added the heavy spring to it?
thoughts and suggestions?
|
Mine was similar and I ended up replacing the throttle cable with a new one and that helped quite a bit. I have a Holley on mine also. I got a new cable for a GMC van (I believe it was) it is a little shorter then the original but very easy to make work.
Hope that helps.
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73 Canyon Lands, (a.k.a. The Yellow Submarine) West Los Angeles CA
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| Re: Super heavy accelerator pedal: how to fix this? [message #99614 is a reply to message #99572] |
Mon, 13 September 2010 17:08 |
bobby5832708
Messages: 237
Registered: November 2006
Location: Winter Springs FL
Karma: 3
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Senior Member |
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On my GMC I replaced the throttle cable with a new one I bought from Jim Bounds, then I put 2 low-tension return springs on the QJet end. The throttle now operates with a light touch on the pedal and I can drive mostly using my big toe on the pedal, which is great because I'm barefoot 95% of the time.
Also, check the pedal rod for a pin sticking out of it (perpendicular to the rod) about halfway between the pedal and the cable. It's where the pedal rod twists in the bracket and is to prevent the rod from sliding side-to-side. Mine was missing the pin and when the pedal rod slid too far sideways it would prevent the throttle from closing completely, it would hold just off idle at about 1100 rpm's. Tapping the pedal a couple of times would make it go back to idle. Maybe that's why the PO put a really heavy spring on yours -- the pedal rod wasn't letting the throttle go all the way to idle and this was a 'brute force' method of making sure the throttle returned all the way.
If your throttle return spring is heavy enough to cause the pedal rod to bend you might also be doing damage to the carb throttle shaft and base. I would put on a new cable just because the one that's there is probably 30+ years old, but that's just me.
Bob Heller
2017 Winnebago 29VE
Winter Springs FL
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| Re: Super heavy accelerator pedal: how to fix this? [message #99729 is a reply to message #99572] |
Tue, 14 September 2010 10:58 |
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Ok so I bought the G-van cable, it was $16.99 at autozone by pioneer cable. its not a direct fit but pretty damn close, you only have to modify the end that goes into the grommet on the firewall. its a little shorter then the stock cable but all you have to do is put the cable loop back a little sooner then stock, it crosses over the main vacuum line to the brake booster rather then all the way from the rear of the engine.
Anyhow after fitting the cable, I went for a test drive, and wow what a difference, I have to relearn how to dive the coach now, since now the throttle is so sensitive if I step on it too much I peel out! Not a bad fix for under 20 bux for a very annoying problem!
73 Canyon Lands, (a.k.a. The Yellow Submarine) West Los Angeles CA
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| Re: Super heavy accelerator pedal: how to fix this? [message #99859 is a reply to message #99729] |
Wed, 15 September 2010 07:32 |
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| Duce Apocalypse wrote on Tue, 14 September 2010 11:58 |
Ok so I bought the G-van cable, it was $16.99 at autozone by pioneer cable. its not a direct fit but pretty damn close, you only have to modify the end that goes into the grommet on the firewall. its a little shorter then the stock cable but all you have to do is put the cable loop back a little sooner then stock, it crosses over the main vacuum line to the brake booster rather then all the way from the rear of the engine.
Anyhow after fitting the cable, I went for a test drive, and wow what a difference, I have to relearn how to dive the coach now, since now the throttle is so sensitive if I step on it too much I peel out! Not a bad fix for under 20 bux for a very annoying problem!
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Glad it worked out for you, it is great when there is a nice simple fix!
Bob & Terry Stockholm
Xenia, OH
1976 PB
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