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Joe
Dodge Dakota
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11/12/2002
18:37:53
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 Subject: mpg keeps going down
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i have an 00' cc w/the 4.7 and an auto and i have seen a fairly steady drop in my mpg over the time i have owned it. last year at this time i was getting roughly 2-3 more mpg. i dont drive it any diffrently, as a matter of fact i dont get in at as much as i did because the mpg is getting so bad. is there anything i can do that may help? i have a custom cat back exhaust and an airaid intake w/265/50/20's and i had them all last year, but like i said it just keeps going down, down, down.... any help would be great.
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chicken bone
Dodge Dakota
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11/12/2002
18:51:38
|  RE: mpg keeps going down
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20inch wheels??? weight more than a honda. plus is your air filter clean. change your plugs, and 02 sensor if that doesn`t work go and run over some honda`s with those monster truck wheels. you`ll feel much better!!
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joe
Dodge Dakota
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11/12/2002
19:06:46
| RE: mpg keeps going down
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i forgot to mention, i only have 18k on the truck. the filter is in great shape, i havent checked the plugs, but with this little amount of miles i would hope they would still be ok?!! is there anything else i can try? can the ecu be reset? i am sitting at about 9-10 city when last year i was about12-14.
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v8dakota
Dodge Dakota
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11/12/2002
22:39:50
|  RE: mpg keeps going down
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I would change the plugs. Mine did the same, and I got it all back when I changed plugs. I waited till 50xxx, but should have done it at about 20xxx. My plugs didn't look bad, but a lot of material was burnt off the end, leaving a gap of .050 - .055.
2000 RC 4.7 5sp, 360 Air Intake, Flowmaster 40, Hurst Comp+ Shifter.
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1Flamed92Dak
GenII
11/12/2002
22:44:41
| RE: mpg keeps going down
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They might have reformulated your gas in your area and that might bring on the lower mileage they do it here in California quite often, Just my 2c worth
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91DakotaFreak
Dodge Dakota
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11/12/2002
22:49:29
| RE: mpg keeps going down
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I have had the same problem with my dak I went from 12-14mpg to 7-8mpg i have the 318 and an auto and it has 97800 on it I had a back pressure test on it and got a 3 the first test and a 1 the second so im getting my cat replaced i would do the same thing have the dealer do a backpressure test on it and see if your cat is plugged remember it still could be plugged even if it doesnt rattle
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Dan Gruber
GenIII
11/13/2002
03:28:29
| RE: mpg keeps going down
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Definitely check the plugs. Our trucks seem to be very sensitive to plug gap, and as plugs age the gap generally gets bigger. That will kill mileage. And if you're running a cooler plug than stock, try less gap than the .040 that's recommended...I've heard that .035 works well with cooler plugs.
And 1flamed92dak is right...the winter blends of gas sold in a lot of areas will kill mileage as well.
Dan
2000 CC SLT 4.7 4X4 Auto 3.92 LSD
3 inch Performance Accesories lift & 32 inch BFG MT KM's
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91DakotaFreak
Dodge Dakota
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11/13/2002
10:02:32
| RE: mpg keeps going down
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but would it kill my gas milage 50-80 to the tank. I have a 91 so i dont have the little over head computer display. I always put the same amount of gas in it every week
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REKER
*GenIII*
11/13/2002
10:03:55
|  RE: mpg keeps going down
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Dan, im going to try that RE-Gapping of my plugs. My mileage has also been going down. I have a 2k 4.7 CC 4X4 and i was getting over 15mpg CITY a few weeks ago and now im getting 12 to 13.5. Hopefully that regapping will work.
thanks
oh, i have the Autolite 3923s
ROB aka REKER
Mods: Alpine CD Head Unit, Pioneer 3-Way 6 1/2 in the Cab, Home Brew Grille(soon to be silver with clear coat), Autolite 3923 plugs, Custom Air Intake (blue fading into silver), GunMetal Black Altezza Taillights, Switched over to Mobil 1.
Next Mod: Performance Accessories 3
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