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| From | Message |
| kbharbison Unregistered  1/02/2001 19:50:45 |
 Subject: 3.9 gas mileageIP: Logged Message: I bought a '96 Dakota with 52,000 miles on it in August. To make a long story short, it needed the new timing chain guide installed, and somehow the dealer ruined the engine. I think they ran it without any oil in the engine. They found a '95 3.9 with 32,000 miles on it and installed it. I have two questions, the orginal motor had no lifter noise. The replacement motor has lifter noise. Is any lifter noise in the 3.9 normal? Also, the orginal motor got 22.5 mpg on the highway. The replacement motor only gets 14.5 to 15.5 mpg on the highway. They used the orginal intake, distributor, and fuel injection system on the replacement motor. Does the 3.9 have a knock sensor on it, and could it be "hearing" the lifter noise and retarding the timing and causing the poor fuel mileage? The lifters are not real noisy, I hear them around 2,000 rpm the most. Other than that the engine runs fine. One more thing, the dealer updated the PCM with the latest software. Thanks for any information anyone can provide. |
| Bernd GenIII  1/03/2001 00:21:37 | RE: 3.9 gas mileage IP: Logged Message: I'd take it back to the dealer. They don't have "lifter noise" and they normally get around 17-18mpg (averaged). They also don't have knock sensors. Bernd D. Ratsch 1997 Dodge Dakota SLT Supercharged w/Nitrous |
| yt Unregistered 1/03/2001 10:43:20 | RE: 3.9 gas mileage IP: Logged Message: hey bernd is that 17 - 18 mpg an avergage on all 3.9's?? i have a 2000 3.9 4x4 dak and gas milage sucks. just under 14 mpg.... yt |
| Bernd GenIII 1/03/2001 10:47:19 | RE: 3.9 gas mileage IP: Logged Message: Oh ok...so I didn't say "4x4's will have lower mileage due to the added weight and driveline components." ;) But yes, the 17-18 is an average from over a hundred V6 members on the DML. We ran a "survey" about a year ago on the subject. Bernd D. Ratsch 1997 Dodge Dakota SLT Supercharged w/Nitrous |
| Kevin in KC Gen II 1/03/2001 22:22:32 | RE: 3.9 gas mileage IP: Logged Message: What kind of mileage should I expect from a 95 5.2 2wd 82000 miles?? |
| Bernd GenIII 1/04/2001 00:20:43 | RE: 3.9 gas mileage IP: Logged Message: Depends on driving style mainly...but a close "guesstimate" would be about 16. Bernd D. Ratsch 1997 Dodge Dakota SLT Supercharged w/Nitrous |
| Kenny Dodge Dakota  8/25/2001 03:23:03 |  RE: 3.9 gas mileageIP: Logged Message: I have a 2001 with a 3.9 automatic 2wd. With about 40/60 city/hwy driving with A/C on, I get anywhere from 15-18 mpg. The best I did with 97% hwy driving was 19.7 mpg. Am looking forward to seeing what I get when I don't have to run the A/C |
| Lesley Dodge Dakota 8/25/2001 10:16:51 | RE: 3.9 gas mileage IP: Logged Message: I have a 97 auto 3.9 - pretty much the same mileage as Kenny. I got the timing chain replaced last year, noticed a big difference after that. Great for highway driving. |
| Jacob Dodge Dakota 8/25/2001 11:31:01 | RE: 3.9 gas mileage IP: Logged Message: I have a 2000 3.9L auto i get about 15-16 in the city and about 18 on the highway depending on my driving style. But I have a heavy foot so... |
| Rob Dodge Dakota 8/26/2001 01:18:16 | RE: 3.9 gas mileage IP: Logged Message: I routinely get 18+ mpg. The trick is only use your AC when its absolutely needed. The rest of the time roll down the windows, open the rear and turn up the tunes. |
| Kenny Dodge Dakota 8/26/2001 02:00:35 | RE: 3.9 gas mileage IP: Logged Message: I don't roll down the windows in Phoenix until Nov. Don't like that 112 blowing in on me. I hear the Toyota doesn't do much better either on the six and the Dak is bigger and heaver than the Toy |
| cbsdakota Gen III   8/26/2001 10:04:50 | RE: 3.9 gas mileage IP: Logged Message: I get 16/20. |
| Mike Dodge Dakota 9/01/2001 00:06:27 | RE: 3.9 gas mileage IP: Logged Message: I got a 2001 Dakota 4WD 3.9L 5-speed and I get between 21-23 mpg in the summer and using 4WD in the winter continusly I never get under 18. |
| Bill Dodge Dakota 9/04/2001 19:38:35 | RE: 3.9 gas mileage IP: Logged Message: I have a 2001 3.9 V6 4x4 Club Cab and get around 16.5mpg on highway, a little less in the city. |
| Vermonster Dodge Dakota 9/05/2001 18:12:38 | RE: 3.9 gas mileage IP: Logged Message: I have a 2000 3.9 4x4 Club Cab and get about 14.5 mpg. |
| Mike Dodge Dakota 9/06/2001 00:44:59 | RE: 3.9 gas mileage IP: Logged Message: I get on average between 17.5 and 19 on the highway...the sticker said 21 for highway mileage when i bought it....only did it once, and i drove like a grandma;)~~ the way i drive 17-19 is average. anybody else having pinging problems?? i finally got it whipped, i think... Mike La Grande, OR '00 Sport, v6, 5 speed |
| kraw Dodge Dakota 9/06/2001 02:03:36 | RE: 3.9 gas mileage IP: Logged Message: my 1990 3.9 was lucky to get over 20mpg.. my 98 5.2 does it on most long road trips. odd isn't it =] krawdaddy.net |
| Trip Dodge Dakota 9/06/2001 11:47:33 | RE: 3.9 gas mileage IP: Logged Message: I have a 99' 3.9 CC 4x4 5 sp with 36000 miles, and almost always get 20-22mpg. I have even "babied" it and seen as high as 23 or 24. Put in the 3923's and did not really see any difference except that it did seem to run smoother. The gas mileage from this truck has really surprised me. I road-race motorcycles and do not drive that slow, so a light foot is not the reason??? |
| EatRice Dodge Dakota 9/06/2001 11:49:50 | RE: 3.9 gas mileage IP: Logged Message: The Gas milage sucks comming from the 3.9. I had one and my 5.2 gets the same or better milage. As for the enging noise, almost all 3.9's make alot of noise, and most have a characteristic rough idle. The noise you could be hearing may be the timing chain slapping. There is a tensioner that can be installed to cure this problem. |
| Gunther Dodge Dakota 9/06/2001 13:44:27 | RE: 3.9 gas mileage IP: Logged Message: That sucks for you. My 98 Dag gets 17 in town and 23 or so on the highway. All stock 2x4 reg cab auto, 3.9, 3.55 The K&N drop-in helped out a lot. 400 miles from a tank of 87 exxon gas for over all driving. Beat that with your 5.2 as for the engine noise no problems with that either with 63,000 miles on it. Dont talk crap about the V6 Dags |
| Kris239 *DakotaEnthusiast*  9/06/2001 14:20:18 | RE: 3.9 gas mileage IP: Logged Message: I drove a good 250 miles at 70 mph. The Tach sat betweeen 1900-2100 RPM's and I got 20.6 miles to the gallon. That includes a little city driving also, where I also got 16.6 miles to the gallon. I need to know all this cause my sending unit is shot for the gas tank. Kris Harnack 1994 Dodge Dakota SLT 3.9L V6 / RC / SB / Auto |
| Kris239 *DakotaEnthusiast* 9/06/2001 14:21:35 | RE: 3.9 gas mileage IP: Logged Message: I drove a good 250 miles at 70 mph. The Tach sat betweeen 1900-2100 RPM's and I got 20.6 miles to the gallon. That includes a little city driving also, where I also got 16.6 miles to the gallon. I need to know all this cause my sending unit is shot for the gas tank. Kris Harnack 1994 Dodge Dakota SLT 3.9L V6 / RC / SB / Auto |
| Randall Niznick Dodge Dakota 12/27/2001 17:29:21 | RE: 3.9 gas mileage IP: Logged Message: I have a 98 4x2 3.9. I installed free flow exhaust and cold air intake. Am getting 12.9 in city and 14 highway. Looking at everyone else...I think I may have a problem. Anyone for suggestions?? Have a tonneau cover as well. Thanks. |
| Daniel D Dodge Dakota 12/27/2001 22:09:24 | RE: 3.9 gas mileage IP: Logged Message: my 95 x-cab v6 gets 13 in city 20 on hwy, when i had the performance computer i got 11-12. Daniel D http://www.angelfire.com/la3/finedak |
| neil Dodge Dakota JOIN HERE 4/28/2002 16:35:29 | 1993 3.9 gas mileage IP: Logged Message: I have 1993 dakota sport 3.9l I was getting about 450km to tank full 55 liters and than it drop to about 325km per tank full and any help would me nice neil |
| Todd W GenIII  4/28/2002 18:26:16 | RE: 3.9 gas mileage IP: Logged Message: My truck is now getting 21 MPG, when I first got it it got around 18... Not sure exactly what I did to it to get the increase. It was getting 18 up until I ported the TB, relocated the IAT, and changed to the Autolite plugs. After that, 21... '00 RC Sport, Forest Green, 3.9L, 5-speed 3.55, Airaid Intake with relocated IAT, Autolite 3923s, Ported Throttle Body, Borg & Warner Cap/Rotor, Accel Coil, JBA 9mm Wires 'Do not trifle with me--I am a master of Chop-Off-Obnoxious-People's-Heads-Do!' |
| Kenny Dodge Dakota JOIN HERE 4/28/2002 20:11:09 | RE: 3.9 gas mileage IP: Logged Message: I have had my Dak for over a year now and drove it with the A/C on and off. Haven't noticed much difference either way. It a club cab 2X4 I get between 15.5/17 city/hwy and 17/19 hwy. Have never got to 20 yet. |
| randy niznick Dodge Dakota JOIN HERE 4/28/2002 21:56:59 | RE: 3.9 gas mileage IP: Logged Message: Hey Todd W, I have the airaid intake as well, where exactly did you relocate your IAT??? I didn't move anything, just installed the intake. Thanks for your help!! Mopar or no car!! |
| 92dakotahd GenII  4/28/2002 23:47:13 | RE: 3.9 gas mileage IP: Logged Message: I have a 92 3.9L CC 124k and I average 16 on most tanks but I fill the tank very well when I do. I used 89 octane and during the summer if I turn on my A/C it'll take me for 5 mpg or more. |
| Ken Dodge Dakota JOIN HERE 11/01/2002 13:25:34 | RE: 3.9 gas mileage IP: Logged Message: I have a 2000 3.9 ex-cab with an ARE cap on back. only get 6-10 around town and lucky to get 17 on the highway. Gas mileage always was terrible. Back to the dealer several times and they couldn't even be bothered to really check it out. Just hook up the computer and say all codes show normal! I get another problem. 1-2 times a year, usually when temp starts to turn cooler, engine won't stay running and constantly stalls. Goes away after a few miles and may not return for several months, or may happen a few days in a row before it's gone. Any ideas about what may cause this. The engine seems more peppy when this happens, then back to it's old sluggish laboring normal self. |
| street guy Dodge Dakota JOIN HERE 11/03/2002 10:32:26 | RE: 3.9 gas mileage IP: Logged Message: getting 21.5 mpg with a home brew cold air that is designed to increase manifold pressure at wide open and at speeds over 45 mph. It actually changes vacumm at 75 mph and wot to "0" psi "0" vacumm, not quite a blower but a lot cheaper. |
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