Question Injector contribution

butch2000

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So I bit the bullet a month ago , and did all 8 injectors , ran great ! now in the morning it runs a little ruff ? no codes , but I did a cylinder contribution test , and #1 is at -20 , and #8 is at -53 ? the rest all 0 at idle ? so I am assuming that those 2 injectors are bad ?
 

BIG JOE

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Does it clear up after warm up ?

HPOP ? 8 new injectors, on an OEM HPOP could be causing issues ? (500 min HPOP psi at start-up/idle is needed) (5w40 oil ?)

Fuel pressure at the FPR good ? (50 min.. 70 is better)

Air in the fuel system ?

Joe

Sorry I missed yer Post.
 

butch2000

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58 psi fuel pressure , lots of psi at icp , why would only 2 injectors be giving problems , if it where any of the above ? could the nipple cup seals be weak on those 2 injectors ? it does get better as it gets warm
 
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BIG JOE

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Cuz it clears after things warm up.. you might wana just run it for a week or two.. see if it gets better or worse ? I'm not very 6.0 savvy, but what yer saying smacks of oil/fuel Pressure issues, or maybe something to do with the warm up sensor data to the ECM during warm-up ?????

Joe

Fuel Filters ?
 

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