Commanche2 Posted March 3, 2021 Share Posted March 3, 2021 Hello , I have a rebuilt 4.0 Comanche 2 wheel drive . 11 mpg in winter ! Also bench seat has a hole in it .... can’t find a good cover . I’ve tried 195 thermostat anything else I can do? Link to comment Share on other sites More sharing options...
Jesse J Posted March 3, 2021 Share Posted March 3, 2021 Just now, Commanche2 said: Also bench seat has a hole in it .... can’t find a good cover . link in sig! the plan is to start making them for people. I just need to finish up my interior then I will figure out pricing and logistics Link to comment Share on other sites More sharing options...
89 MJ Posted March 3, 2021 Share Posted March 3, 2021 It is typical for vehicles to get slightly worse fuel mileage in the wintertime, but I think your fuel mileage is off. Does your truck seem to run rich at all? What size tires and gears do you have? What is your driving style? Link to comment Share on other sites More sharing options...
Commanche2 Posted March 3, 2021 Author Share Posted March 3, 2021 (edited) IDK my brother bought the truck brand new in 1987 first year for 4.0,and it had 178k on original motor before I swapped for an Exteme machine long block from Lake Tahoe ,Cali.,its a 1/2 ton truck and I`ve had over a ton on it .It`s a long bed i have platinum plugs ,new injectors . also the pigtail wiring and ballast resistor was missing from the factory for the auxiliary fan ,so i have it rigged to a switch. more than likely lower rear end gears,and is probably running rich. 235-75-15 Bridgestone Deulers on stock steel rims for winter Edited March 3, 2021 by Commanche2 left out tire size Link to comment Share on other sites More sharing options...
89 MJ Posted March 5, 2021 Share Posted March 5, 2021 Hmmmmmm, let's start with pulling the spark plugs and looking to see how those look. How are you getting your MPG reading? If you are doing it by your odometer and dividing that by the number of gallons you put in, your reading might be off if your speedometer is off at all. Link to comment Share on other sites More sharing options...
driveslowsnackoften Posted March 5, 2021 Share Posted March 5, 2021 I had awful gas mileage until I realized I had knocked the vacuum line out of the MAP sensor. Was like flipped the Fixed/Broken switch. Maybe give that line a looking over. Link to comment Share on other sites More sharing options...
jdog Posted March 5, 2021 Share Posted March 5, 2021 On 3/3/2021 at 10:10 AM, Commanche2 said: platinum plugs These motors hate these plugs. When was the last time you changed the 02 sensor? Link to comment Share on other sites More sharing options...
Pete M Posted March 7, 2021 Share Posted March 7, 2021 plain jane copper plugs do work best Link to comment Share on other sites More sharing options...
Pete M Posted March 7, 2021 Share Posted March 7, 2021 also raybuck.com makes seatcovers for certain benches. Link to comment Share on other sites More sharing options...
cruiser54 Posted March 7, 2021 Share Posted March 7, 2021 Have you completed Tips 1 through 5 at www.cruiser54.com? Copper plugs are fine. How old are the plug wires, cap, and rotor? Should be replaced every 30,000 miles like the plugs. Link to comment Share on other sites More sharing options...
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