Several issues
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Joined: Sep 2017
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Several issues
Ok so it seems like im gettin really bad gas mileage in ny 98 3.9 auto....ive been tryin to judge it but my speedo will only work if goin over 35 mph abs and brake light are on too...but like last night it was on E and i put 10 bux in it and it took me to almost half a tank which doesnt seem right....so i dont kno if gas mileage is bad or float is jacked up....the baffles in my cat rattle like crazy too lol
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Joined: Jun 2017
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The abs/brake light and speedometer not working under 35mph is the abs sensor ontop of the differential. About a $35 part and 15 minute job. One plug, one bolt. I had to do this first thing when I bought my 98 3.9l.
Likely your gas mileage seems bad, because these trucks come standard with a 15 gallon tank, so every mark on the gas gauge is (by math) 1.875 gallons. Or roughly (if getting good mileage) 37.5 miles per 1/8th mark. This is calculated at 20mpg, naturally it definitely will be lower if you have issues, such as your cat being dead. The best way to check fuel mileage is simply top it off and letthe gas pump shjtoff on it'sown, don't tap it. Then note your odometer and gallons put in. Next fillup do the same thing, subtract old odo reading from new one to get miles traveled (or use the trip meter) then divide it by the amount of gas you just put in. That will give you an estimate of your mpg. You can also use the fuelly app to keep track of. But for your gauge, note where it is, say half a tank, fill up. If you're around the 7-8 gallon mark, your gauge is fine. Use the 1.875 figure from above to help if at other levels.
Likely your gas mileage seems bad, because these trucks come standard with a 15 gallon tank, so every mark on the gas gauge is (by math) 1.875 gallons. Or roughly (if getting good mileage) 37.5 miles per 1/8th mark. This is calculated at 20mpg, naturally it definitely will be lower if you have issues, such as your cat being dead. The best way to check fuel mileage is simply top it off and letthe gas pump shjtoff on it'sown, don't tap it. Then note your odometer and gallons put in. Next fillup do the same thing, subtract old odo reading from new one to get miles traveled (or use the trip meter) then divide it by the amount of gas you just put in. That will give you an estimate of your mpg. You can also use the fuelly app to keep track of. But for your gauge, note where it is, say half a tank, fill up. If you're around the 7-8 gallon mark, your gauge is fine. Use the 1.875 figure from above to help if at other levels.
