Carburetor
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Mountain Pass
Joined: Jul 2015
Posts: 182
Likes: 0
From: Queensland, Australia
Carburetor
Hi, I have been having problems with my truck idling too high as I pull up to lights etc. If I blip the throttle the revs come down.
I noticed the other day at home under the hood that when I operated the throttle. Half a second later I could see fuel appear where I have marked on the photo (and have been able to clean easily).
I guess this could be a warn throttle shaft bushing? Thanks
I noticed the other day at home under the hood that when I operated the throttle. Half a second later I could see fuel appear where I have marked on the photo (and have been able to clean easily).
I guess this could be a warn throttle shaft bushing? Thanks
Post Fiend
Joined: Feb 2008
Posts: 5,831
Likes: 121
From: St Albert, Alberta
I would say worn throttle shaft also. It is likely causing the throttle plates to hang up on the bore. A quick fix for the interim would be to put the return spring on on the bottom side of the throttle shaft (hooked around the throttle cable ball stud) then hook it to a tab fabbed and mounted under the fore intake bolt for the #8 inlet port. This should pull the the throttle shaft back so the plates are not hanging up in the bore. This would just be temp fix till you get the carb rebuilt or replaced.
Thread Starter
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Mountain Pass
Joined: Jul 2015
Posts: 182
Likes: 0
From: Queensland, Australia
I would say worn throttle shaft also. It is likely causing the throttle plates to hang up on the bore. A quick fix for the interim would be to put the return spring on on the bottom side of the throttle shaft (hooked around the throttle cable ball stud) then hook it to a tab fabbed and mounted under the fore intake bolt for the #8 inlet port. This should pull the the throttle shaft back so the plates are not hanging up in the bore. This would just be temp fix till you get the carb rebuilt or replaced.
yes I guess its ok to undo the bolt for #8?
It doesnt have to be torqued to a certaim value?
Thanks,
Senior User
Joined: Oct 2016
Posts: 401
Likes: 3
From: Rockville, IN Temporarily
I've been turning wrenches for over 35 years now and in that time I've seen many throttle shafts and bushings worn to this point with one resulting in a fatality. Yes you can move the spring or even add a stronger one but you could also find it may lock the throttle open to a position where it is dangerous. For safety's sake either have the throttle plate bushed and the issue corrected properly or get a new carburetor. Sometimes the cheap way out just isn't worth the risk.
Thread Starter
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Mountain Pass
Joined: Jul 2015
Posts: 182
Likes: 0
From: Queensland, Australia
I've been turning wrenches for over 35 years now and in that time I've seen many throttle shafts and bushings worn to this point with one resulting in a fatality. Yes you can move the spring or even add a stronger one but you could also find it may lock the throttle open to a position where it is dangerous. For safety's sake either have the throttle plate bushed and the issue corrected properly or get a new carburetor. Sometimes the cheap way out just isn't worth the risk.
a new carburetor went on it this morning.
Still getting the over rev issue. Not as bad, but still anoying to me.
The question. I can reove the #8 intake bolt to fit a bracket?
Are they torqed to a certain vale?
Thanks,
Postmaster
Joined: Nov 2011
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Cargo Master
Joined: Jul 2005
Posts: 2,314
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From: Kansas
I would suspect the throttle cable, make sure it doesn't have any breaks in the coating and it's routing path is smooth with no heavy bends...
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Lead Driver
Joined: Mar 2008
Posts: 7,195
Likes: 387
From: Near Los Angeles
I had nearly the same issue. Do you have an electric choke? My alternator was on the way out, and only supplying low voltage to the choke. So the choke was not opening all the way, and staying on fast idle.
Who would 'ave thunkt it?
Who would 'ave thunkt it?
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