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Old 10-12-2019, 10:00 AM   #1
runningiron
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Carb idling problems on 65' C-10 with 292

Need some help with my 1965 C-10. It has an original 292 with approx 158K miles, 3 speed on the tree. Recent tuneup, new plug wires, plugs, dist cap, points. condenser, new fuel pump and rebuilt 1 barrel Rochester with manual choke. Stock exhaust. I timed it 4 degrees btc, dwell at 31. It is hard to start and takes what seem to be a long time to warm up. The carb stumbles and pops back through the carb at times, not all the time. What am I missing here? Thanks for any info in advance.
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Old 10-12-2019, 10:03 AM   #2
geezer#99
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Re: Carb idling problems on 65' C-10 with 292

Lack of timing and/or heat riser stuck.
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Old 10-12-2019, 10:34 AM   #3
runningiron
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Re: Carb idling problems on 65' C-10 with 292

geezer#99, thanks for responding. Here is a photo of my heat riser and it is frozen in that position. It almost looks to me like it has backed out some. What would be a quick fix on that? Also how much timing would be better that the 4 degrees BTC? Thanks.
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Old 10-12-2019, 10:44 AM   #4
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Re: Carb idling problems on 65' C-10 with 292

Looks like it’s stuck open.

Try timing at 12.
Be sure to plug off vac advance hose while setting timing.
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Old 10-12-2019, 11:01 AM   #5
runningiron
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Re: Carb idling problems on 65' C-10 with 292

geezer#99, I'll be sure and plug off vacuum advance and try timing it at 12. Thanks.
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Old 10-12-2019, 11:54 AM   #6
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Re: Carb idling problems on 65' C-10 with 292

More timing makes it harder to start, not easier.

First thing I would do is triple check the plug wires, put it at TDC, and check the cap/rotor. This could be a firing order issue when I hear about the backfiring.
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Old 10-12-2019, 12:13 PM   #7
runningiron
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Re: Carb idling problems on 65' C-10 with 292

jayoldschool, thanks for your input. I will check the position of the plug wires.
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Old 10-16-2019, 10:26 AM   #8
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Re: Carb idling problems on 65' C-10 with 292

What kind of spark does it throw? It should be blue and jump a gap of about 1/4" or more.

The accelerator pump in the carb is working good?
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Old 10-16-2019, 10:43 AM   #9
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Re: Carb idling problems on 65' C-10 with 292

+1 on the plug wires first; it's an easy fix.

If it only pops through the carburetor when you're trying to accelerate, it sounds lean. Maybe lean mix, maybe a problem with the accelerator pump.

By "hard to start" do you mean slow jerky cranking, or you have to crank it for a long time?

And I have to ask - you're pulling the choke to get it running, correct? And slowly pushing it in as it warms up?
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Old 10-17-2019, 11:39 PM   #10
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Re: Carb idling problems on 65' C-10 with 292

I want to thank all that responded. Turned out to be part vacuum leak and timing. Thanks all.
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