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| | | | Joined: Nov 2009 Posts: 239 'Bolter | | 'Bolter Joined: Nov 2009 Posts: 239 | After getting my 53 GMC back from being worked on, I noticed it idles very fast, between 600 and 800 rpms. I read the procedure on how to set the idle using the throttle set screw and idle mixture screw. It appears pretty straight forward. So I attached my vacuum gauge and tachometer and started.
However, for some reason, the throttle adjustment screw doesn't appear to effect the idle. I can turn it 8 to 10 turns in both directions and the idle never changes. I can push down on the throttle lever and make the idle go down but as soon as I release the lever it starts reving up again.
What am I doing wrong or what do I need to do?
The carburator is a zenith 228. Also, I know the throttle pull wire is not interfering.
Thanks for your help,
Dale
Last edited by di1953gmc; 12/18/2011 9:01 PM.
When I die, I want to go peacefully like my Grandfather did, in his sleep -- not screaming, like the passengers in his car.
-Unknown-
| | | | | Joined: Feb 2004 Posts: 29,749 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,749 | Worn bushings in the throttle body will let the plate stick in the bore slightly off-idle, or it's possible that the throttle plate isn't centered in the bore if the bushings aren't the problem. Remove the carb, loosen the screws holding the throttle plate to the shaft, and tap it to center it. Then retighten the screws. Don't try to remove them completely- - - -they're peened on the back side to keep a loose one from falling into the engine.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Mar 2005 Posts: 1,636 'Bolter | | 'Bolter Joined: Mar 2005 Posts: 1,636 | Is this with the rest of the accelerator linkage hooked up? If so, then unhook it and see if it will go to idle then. If it will then something with the linkage is binding.
| | | | | Joined: Oct 2010 Posts: 1,232 'Bolter | | 'Bolter Joined: Oct 2010 Posts: 1,232 | Could the stop on the manual throttle cable be set too close?
- Lonnie My '54 3104Photos that I have shared on Stovebolt via PhotoBucket are no longer available. Please contact me if you want a photo from an old post. lonniecook [at] aol [dot] com. I sold my '54 3104 12/12/2017, but I still visit Stovebolt. OLD STUFF ... houses, furniture, cars, wine ... I love it all | | |
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