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Hello all, so I have been fighting a weird miss I have on my 7.3 for awhile now, well while my ac compressor went out I decided to pull the belt and check and make sure everything was in good condition pulley wise while replacing the compressor, deciding to check the harmonic balancer I fired up the truck with the belt off and noticed that it had a decent wobble to it as it went around, So wondering if maybe bad harmonic balancer would create a weird miss sounding at idle and cuase the truck to not idle smoothly like it should. I did the 1200 rpm test to check for any weird vibrations and as it crept up to 1200 it did begin to shake until I got into the higher rpms, I went over to my brothers truck which is a 7.3 to and did the same test and his had no shake to it at all. Would the balancer create a shake and unsmooth idle sound. ANY HELP WOULD BE MUCH APRECIATED !!!!!!:grin::frown:
 

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yup, deteriorated rubber in the balancer has caused it to slip, and become out of balance.
replace it with a good one and get rid of that bad one!!
 

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Sure it can! For example a bad Dual Mass Flywheel (used on the 5-speed trucks) have been known to cause the same symptoms as a miss. Cheers!
 

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To add to Patrick’s comment. If your truck is a manual I’d check wear of dual mass clutch first. Should be less than 3/4” rotational play between the dual masses. To view take off inspection plate on bottom of bell housing. Often on dual mass systems out of spec clutch can cause rough idle, and engine miss symptoms. Typically when truck is running down to idle in gear and you push clutch peddle in will idle really rough. Also upon start up, but will smooth out on engine acceleration.
j
 
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