Author Topic: 403 olds with factory carb stalls sometimes at idle  (Read 1679 times)

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Offline 79 trans am ta

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403 olds with factory carb stalls sometimes at idle
« on: October 18, 2022, 12:01:02 AM »
car runs great no hesitation no bogging only problem is sometimes it will stall warmed up  when idling. i checked all vac lines and sprayed carb cleaner at carb and vac lines and no reaction,

Offline eviledolean

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Re: 403 olds with factory carb stalls sometimes at idle
« Reply #1 on: October 18, 2022, 12:21:57 PM »
Rough Idle or stall

This can be caused by several things, but there is one item often missed by the rebuilder and that is the idle tube. These are very small passages and get clogged easily with ethanol residue. Use thin wire to clean out the passages completely. Blow out with compressed air. A whistle with air will indicate a clean passage. If wire doesn’t do it, try heating the outside of the passage and then blow air through. There may be a small air restrictor in the passage that makes getting through with wire difficult.
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Offline 79 trans am ta

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Re: 403 olds with factory carb stalls sometimes at idle
« Reply #2 on: October 18, 2022, 01:42:27 PM »
if its not that what are the other reasons