Vintage Oldsmobiles Curved Dash, Limited Touring, Models 40, 53, 66; Series 60, 70, 90

54 88 Won't idle

Old July 25th, 2018, 06:57 PM
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54 88 Won't idle

I hadn't started the ole boy for a few days and today I went out and fired it up and it ran for 20 seconds and stalled out.
As long as I give it pedal it stays running but when I remove my foot it stalls .
I had my lady start it and if I put my hand over the primary side of the bowl and regulate air flow and work the choke flap it runs but the second o remove my hand it stalls out.
I have a shop manual and have been reading about the 4GC Rochester but I'm kinda stumped.
Any help would be helpful.
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Old July 25th, 2018, 08:58 PM
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The first thing I would check for is vacuum leaks. The 4GC Rochester is pretty easy to rebuild and is a good carb. Put a vacuum gauge on it and see what kind of reading you have. It should be 15 " or more and a steady reading.
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Old July 25th, 2018, 09:56 PM
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The 20 seconds it was running was the choke closed? Like during warm up?
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Old July 26th, 2018, 03:59 AM
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It could be a lot of things. Be sure the ignition system is up to par. Then consider doing a rebuild on the carburetor. The Rochesters are not so difficult once you understand the principles of operation. Just be sure to pay attention to details. The shop manual is a good start.
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Old July 26th, 2018, 03:29 PM
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Got it

Adjusted the choke
problem solved
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Old July 26th, 2018, 04:03 PM
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That was easy. Congrats.
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