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Old 07-03-2019, 07:04 AM   #1
Two-Ten
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Default dead cylinders...part time?

Leaving the big car show last weekend and idling up to a stoplight, the engine tone changes from the usual v8 rumble to a smooth weak hum of a 4 cylinder and rpms drop to 500/600. Threw it in neutral and revved it up, problem went away, sounded normal again, regained full power and usual tone until next stoplight. Then it happened again. I couldn't shift into neutral fast enough and it died. After restarting, it was like nothing happened, and I made it back home with no issues, and idled just fine.

Im not sure what was causing this. Revving it up to 'clear' the issue leads me to believe some kind of fuel issue, but seeing as how it went away after restart leads me to an ignition issue?

Engine temp during this scenario was 150-160

Motor is a 327 from 1969 camaro.
Distributor is and HEI type with built in coil. Unsure on brand, it is red.
Carb is 650 edelbrock with manual choke.
700r4 tranny.

I was going to start with new plugs.

Thanks
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Old 07-03-2019, 10:10 AM   #2
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As mentioned in an earlier post try some non-ethenal gas... Al
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Old 07-03-2019, 10:31 AM   #3
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I would suspect a stuck float valve or trash under the float valve needle.
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Old 07-03-2019, 07:37 PM   #4
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Quote:
Originally Posted by Two-Ten View Post
Leaving the big car show last weekend and idling up to a stoplight, the engine tone changes from the usual v8 rumble to a smooth weak hum of a 4 cylinder and rpms drop to 500/600. Threw it in neutral and revved it up, problem went away, sounded normal again, regained full power and usual tone until next stoplight. Then it happened again. I couldn't shift into neutral fast enough and it died. After restarting, it was like nothing happened, and I made it back home with no issues, and idled just fine.

Im not sure what was causing this. Revving it up to 'clear' the issue leads me to believe some kind of fuel issue, but seeing as how it went away after restart leads me to an ignition issue?

Engine temp during this scenario was 150-160

Motor is a 327 from 1969 camaro.
Distributor is and HEI type with built in coil. Unsure on brand, it is red.
Carb is 650 edelbrock with manual choke.
700r4 tranny.

I was going to start with new plugs.

Thanks

Don't waste your time on the plugs, 4 plugs aren't going to fail off and on. Sounds like a fuel problem, check the pressure and dirt in the carb.
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Old 07-03-2019, 07:41 PM   #5
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Sounds like some dirt in one of your idle circuits to me. Pull both mixture screws out, Give a shot of carb cleaner in there followed by a blast of compressed air. Reinstall the mixture screws, Fire it up and adjust them. See what you have at that point, It is a fairly common issue with the trash they are selling for gas today.
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Old 07-03-2019, 08:21 PM   #6
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I had a similarly weird problem but it turned out to be the heat shield/spark plug wire..... after the engine heated up it would occasionally miss...... Turned out the heat shield would expand when hot and get close enough to the heat shield and arc to ground.....
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Old 08-12-2019, 01:02 PM   #7
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Quote:
Originally Posted by TheHotrodHandyman View Post
Sounds like some dirt in one of your idle circuits to me. Pull both mixture screws out, Give a shot of carb cleaner in there followed by a blast of compressed air. Reinstall the mixture screws, Fire it up and adjust them. See what you have at that point, It is a fairly common issue with the trash they are selling for gas today.

I tried the above tip, and it seemed to help. I also replaced the plugs. They were barely gaped to .030 several were completely oil soaked, and several were grey hot. I gaped the new plugs to .040. It is running smoother and has not lost cylinders like it was doing before. I plan on pulling the plugs after a few hundred miles to see how they look. I'm guessing the problem was a mix of trash in the carburetor low speed circuit and the plugs weren't gaped properly to ensure a complete burn. I have been running premium non-oxy fuel the whole time.
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