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02-25-2021, 01:00 PM | #1 |
Senior Member
Join Date: Nov 2010
Location: Sebastian, FL
Posts: 479
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29 Roadster won't idle all the way down
My roadster is running fine but when I come to a complete stop the engine does not idle all the way down. If I put my toe under the accelerator pedal and pull it back it then idles all the way down. I can not find any info in either of Les Andrews books about the linkage on the firewall. Before I start taking it apart would like to know if anyone else has had this problem and what cured it. Thanks, Jim
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02-25-2021, 01:13 PM | #2 |
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Join Date: Jul 2012
Location: Central Maine
Posts: 644
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Re: 29 Roadster won't idle all the way down
Check to be sure the idle screw is backed off on the carb so the throttle closes. Also check and lube all of the throttle rod parts don't forget the apparatus on the firewall. Also check that nothing is binding with the hand throttle linkage. Because you can close the throttle with your foot I think you have a sticky/binding system.
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02-25-2021, 01:52 PM | #3 |
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Join Date: May 2010
Location: brentwood, ca
Posts: 4,246
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Re: 29 Roadster won't idle all the way down
There are two points on the accelerator assembly that bolts to the back of the block that Pete mentioned that need oil. Usually out of sight and out of mind. If the cross shaft was bent during a engine removal it can bind up. I have straightened several in the bench vice.
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02-25-2021, 02:09 PM | #4 |
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Join Date: Jul 2011
Location: Redondo Beach, CA
Posts: 5,849
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Re: 29 Roadster won't idle all the way down
While you're lubing the linkage check your return spring for binding.
Also check to ensure the linkage is allowing the carb butterfly to travel all the way closed. I recently installed a Marvel Schebler carb and ran into this. I had to fab an "adjustable" throttle rod to allow the carb to close fully. Last edited by Y-Blockhead; 02-25-2021 at 02:20 PM. |
02-26-2021, 07:39 AM | #5 |
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Join Date: May 2010
Location: Largo Florida
Posts: 7,225
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Re: 29 Roadster won't idle all the way down
The info about oiling all the linkage points and making sure they are free, straight and moving properly is good.
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02-26-2021, 08:43 AM | #6 |
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Join Date: Jun 2014
Location: Land of Lincoln
Posts: 3,131
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Re: 29 Roadster won't idle all the way down
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02-26-2021, 07:35 PM | #7 |
Senior Member
Join Date: Apr 2012
Posts: 1,542
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Re: 29 Roadster won't idle all the way down
difficulties ewith the accelerator assembly appear here periodically. does anyone have a copy of the engineering draft that might show how much bend the part was designed with?
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02-27-2021, 02:41 PM | #8 |
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Join Date: May 2016
Location: Scottsdale, Arizona
Posts: 612
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Re: 29 Roadster won't idle all the way down
Good afternoon...I have seen several Model A's with an extra little spring mounted to a little pad eye about where your passenger would put their right big toe! The pad eye is screwed to the plywood floorboard and a small fairly stout spring then goes from it to the connection of the throttle cross-shaft and the linkage that goes up to the throttle butterfly on the side of the zenith...works really well...as an easier fix than removing the cross-shaft and putting a new spring on same...Ernie in Arizona
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02-27-2021, 08:22 PM | #9 |
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Join Date: Jul 2011
Location: Redondo Beach, CA
Posts: 5,849
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Re: 29 Roadster won't idle all the way down
I use a fulcrum spring similar to this. I didn't like the way a coil spring pulls back on the throttle shaft.
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