Fuel consumption and trouble codes - Hemi Truck Club
 
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Old 07-06-2013, 05:49 PM   #1
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Fuel consumption and trouble codes

So I moved from the East Coast to the West Coast, Carolina to California. First thing, I towed a trailer and a bike total weight was 1200 pounds and I got around 11 mpg's, does this seems correct? And now after I dropped the trailer, I am getting 13 mpg's here in Cali with a lot of freeway miles. Back home in Carolina I got 16 mpg's....
Ok and second is that my engine light just came on with a cylinder 6 misfire, so I am going to check the plug, COP, wire, etc...

My truck in an 05 quad cab, 5.7 magnum with 73,200 miles on the engine, 4wd with RC leveling kit, engine has AEM brute force CAI, chipped with Superchips Mileage XS tune, flowmaster 44 muffler with dual out tips at the corners of the bed, stock 17 inch off road rims with LT 285 70 17 Nitto Terra Grapplers.

Chime in on all and let me know and I will post my findings. Anyone know of a good shop in the SoCal area, Temecula, Riverside, Corona area. Thanks!

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Old 07-06-2013, 06:06 PM   #2
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Plugs should be changed every 30k on a hemi I there original plugs Deff change them out your mpg is not to far off a normal truck maybe around 15 is more normal but that could be from the plugs also check the pcv valve good maint item to check
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Old 07-06-2013, 10:01 PM   #3
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Well, it all worked out. I need to change out my plugs, I had done them about 3 years ago with NGK's and i will replace with NGK's again. I have Taylor shorty wires on them and I never had a problem with them. So i switched the COP's on cylinder 6 with cylinder 5 on the opposite side, flashed the ECM, and took it for a test drive about 10 miles, no engine light and it seems to be purring again. Maybe the plug backed out a little, or the wire worked loose. Either way I am in the clear for now. I will be looking at the PCV valve and change that out, clean the TB, go for new plugs and service the engine again. Anyone have that decarbonizing engine treatment done? Thinking about it, I do need to have the tranny and transfer case serviced.
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