03 1500 4.7L gas mileage help- newbie questions
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I recently traded my 99 Ram on a 03 1500 4X4 quad with a 4.7 w/141000 miles & modified dual exhaust, two out of engine into one cat and two out of cat with two mufflers. My gas mileage is horrible "11-12 MPG city & highway", my old 99 1500 with a 5.9L 360 had better gas mileage. Is there something I should check or is this normal mileage for a 4.7L? The truck runs great, "geared very high though". The only problem i ever had with it was the other day, the truck was not warmed up yet, i came to a stop sign and it acted like it wanted to shut off the idle became low and rough, then as quick as that set in it picked back up and was fine<<"indication of anything?", other than that all has been great with it. I plan on changing plugs, any suggestions which plugs are best? I hate to change the ignition coils but with the mileage would it be a good idea? Any other tune up parts that would be a good idea to change? Could the exhaust set up be hurting my mileage? Is there any way to know if the previous owner installed the super chip programming and if so can factory be reset? Last, is there a certain mileage that all the ignition coils should be replaced?
Thanks
Thanks
Last edited by mick74; 02-20-2011 at 05:15 PM.
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#5
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As said, all is about normal but being at 141k on the odometer and not knowing what has or hasnt been done to the truck, some good maintenance on your part may help.
I would replace the O2 sensors. At that mileage Im sure they need it. Cleaning the TB would help. Replacing the plugs, air filter, ECT always helps. Some good fuel injection cleaner would be good. I dont think replacing the coils would benefit you though.
Remember the 4.7 is the small V8 and you are in a 4wd truck which is heavier than the 2wd's. On top of that you have a QC. My 04 1500 2wd weighed in at 5880# on the scale last time i did it and that was with 1/4 tank of fuel.
I would replace the O2 sensors. At that mileage Im sure they need it. Cleaning the TB would help. Replacing the plugs, air filter, ECT always helps. Some good fuel injection cleaner would be good. I dont think replacing the coils would benefit you though.
Remember the 4.7 is the small V8 and you are in a 4wd truck which is heavier than the 2wd's. On top of that you have a QC. My 04 1500 2wd weighed in at 5880# on the scale last time i did it and that was with 1/4 tank of fuel.
#6
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Thanks weedahoe , I definitely plan on doing a tune up and TRY to granny the throttle a bit more. I will take you advice on what to replace and clean, any other parts to replace while I am into it? I am not up on all the mods out there but i am seriously considering a cold air intake, they claim to help 1-2 mpg, ill take all i can get. Again, Thanks for the advice.
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