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Old 08-29-2013, 05:39 PM
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Join Date: Apr 2010
Location: Macomb, Illinois
Age: 52
Posts: 742
Gender: Male
Vehicle: 2004 Quad Cab diesel
Trim Level: SLT
Color: Silver
Engine: 2005-20?? 359ci (5.9L) Cummins ISB 610 24-Valve Diesel I6 325hp 610 lb/ft
Rep Power: 5
Rep:217
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If you got the coils back on correctly and gapped them correctly, it shouldn't have hurt your mileage. Did you put any special plugs in or are they just plain Champion copper plugs. I've heard of people having problems with plantinum and the high dollar plugs, but not with just regular plugs.


Also, how do you know your mpg is worse? Single tank? I guess I'm saying are you for sure you mileage is worse, or is it something else.
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2004 3/4 ton Quad Cab, 24 valve 5.9 Cummins
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