Moparts

Dead Cylinders

Posted By: CHRGR69

Dead Cylinders - 04/08/21 03:49 PM

69 Charger 440 with electronic ignition conversion. I had a miss and pulled each plug wire at the cap and had no change in idle on cylinders 1,4,6 and 7. Carb was just rebuilt. ??
Posted By: ruderunner

Re: Dead Cylinders - 04/08/21 04:43 PM

Dirty carb. Sounds like a plugged idle passage. Dual plane intake correct?
Posted By: CHRGR69

Re: Dead Cylinders - 04/08/21 05:20 PM

Stock 440 intake. Dual plane I assume
Posted By: NITROUSN

Re: Dead Cylinders - 04/08/21 06:04 PM

1,4,6,7 all feed on one side of the dual plane intake. Either a massive vacuum leak off the intake vacuum port [try capping it], or carb is plugged internally.
Posted By: nick24

Re: Dead Cylinders - 04/08/21 07:39 PM

Sounds like ignition to me. You might have a carbon tracked distributor cap.
Posted By: ruderunner

Re: Dead Cylinders - 04/09/21 12:06 AM

Read above replies. That would be a huge coincidence if it was distributor related.
Posted By: 6PakBee

Re: Dead Cylinders - 04/09/21 01:38 PM

Originally Posted by NITROUSN
1,4,6,7 all feed on one side of the dual plane intake. Either a massive vacuum leak off the intake vacuum port [try capping it], or carb is plugged internally.


If you have power brakes, this connection has bit me more than once when the booster failed and turned into a vacuum leak.
Posted By: dragon slayer

Re: Dead Cylinders - 04/09/21 01:47 PM

Did distributor work fine before the carb build? If so, last change was the carb and worth checking out. If the conversion was recent to electronic too, then make sure not a Chinese poor quality one. Recently had one that missed fired a few cylinders. Had to change the pickup to original MOPAR and a new reluctor to fix it.
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