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autoimage
Dodge Dakota
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3/19/2002
21:56:08
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 Subject: 3.9 lacks/looses power?
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I have a 2000 dakota 3.9 ,when ever i tow a trailer or a 14ft boat it has fair take off power but it sucks the rest of the way. Like for instance,i picked up bedroom furniture with a friend of mine last month w/a 4x8 trailer load of a( fullsize mat/boxspring,dresser,4x3 cheststorage cabinet & 2 in tables)Thats it nothing in the bed of the truck.his move was about 60/70 miles. it perfomance sticks around town too,like u-turns,i step on the gas,no take off power or passing power either,i minds well put it to the floor then just maybe it'll take off.YOU GUYS GOT ANY ANSWERS,THIS JUNK NEEDS HEELLPP
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Todd W
Dodge Dakota
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3/19/2002
22:11:26
|  RE: 3.9 lacks/looses power?
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Automatic? By chance is it not downshifting?
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autoimage
Dodge Dakota
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3/19/2002
22:26:13
| RE: 3.9 lacks/looses power?
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Its shifts ok? , i had it checked out,had it checked out by 2 well known shops/1 trans shop,nothing found on scopes or anyalizers tests?. another shop told it might be the cat,or fuel filter which is in the tank.another one dodges brainy ideas.the 3rd shop guy said you can have correct fuel pressure but not good flow?
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autoimautoage
Dodge Dakota
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3/19/2002
22:32:29
| RE: 3.9 lacks/looses power?
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Its me again,the truck only has a little over 48,000 miles
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Todd W
Dodge Dakota
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3/20/2002
02:06:09
| RE: 3.9 lacks/looses power?
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Message:
No, I mean, is it shifting out of overdrive when your asking it to accellerate or give you more power? It sounds like it's only downshifting when you stand on it, and thats not right... I'm not sure how you adjust it though, I've got a manual and it pulls trailers just fine.
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autoimage
Dodge Dakota
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3/20/2002
22:39:24
| RE: 3.9 lacks/looses power?
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some times yes but not all the time thats for sure,like yesterday i went to the parts store ,when i left there i had to make a u-turn but when i took off again it wouldn't get out & hall ass.It just bogged out gradually picking up speed even when i stepped on it,also let off & stepped on it again,the same thing happened , it bogged down like it wasn't getting fuel?
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Todd W
Dodge Dakota
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3/20/2002
23:14:22
| RE: 3.9 lacks/looses power?
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If it's not downshifting, thats not the engine, thats the transmission. Or, at least, it's the transmission not knowing it needs to downshift. :0)
Do these things have kickdown cables? I'm not sure, my old Chevrolet had one, you simply adjusted it so it downshifted when you wanted...
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autoimage
Dodge Dakota
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3/21/2002
19:13:28
| RE: 3.9 lacks/looses power?
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ya i have been adjusting the trans shift cable on the throttle body notch by notch,its as far as it can go now.my old 93 dakota had the same 3.9 eng. & 3.55 rear end(slip-differential it does have)?
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jed
Dodge Dakota
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3/22/2002
01:33:55
| RE: 3.9 lacks/looses power?
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My friend has a 2000 dakota sport 3.9 ltr and had the same problem. Just go to the dealership and tell them to download the new program for your truck. Trust me you'll feel the differance.
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MikeW
Dodge Dakota
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3/22/2002
22:41:41
| RE: 3.9 lacks/looses power?
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Have the dealer check the following TSB.
Make: DODGE TRUCK Model: DAKOTA Year: 2000
Service Bulletin Number: 082200 Bulletin Sequence Number: 141 Date of Bulletin: 06/00
NHTSA Item Number: SB614159
Component: ELECTRICAL SYSTEM
Summary:
SOME CUSTOMERS MAY NOTICE A LOWER THAN EXPECTED ENGINE PERFORMANCE DUE TO A POSSIBLE LOSS OR INTERMITTENT LOSS OF THE CAMSHAFT POSITION SENSOR (CMP) SIGNAL. THE LOSS OF THE CMP SIGNAL MAY BE THE RESULT OF THE CMP PHYSICALLY CONTACTING THE TONE WHEEL. *TT
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newbie-tuner
Dodge Dakota
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7/25/2005
17:49:27
|  RE: 3.9 lacks/looses power?
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hello, what is this new program u mentioned?
my 3.9 automatic 1999 dakota, does seem a lil underpowered is this some thing i should be looking at? can someone explain what the "new-program" deal is...what was the new tsb about...oh and has anyone ever tried putting a 3:21 rear ratio in the 3.9 v6?????? HELP!
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Why
Dodge Dakota
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7/27/2005
10:02:24
| RE: 3.9 lacks/looses power?
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...would you want to use taller gears when you already feel you're underpowered?
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daddio
Dodge Dakota
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7/27/2005
11:10:16
| RE: 3.9 lacks/looses power?
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if you feel you're underpowered you would want to go with a lower(higher numerically) gear set such as 3.92 or 4.10 NOT 3.21. as far as programming, try looking into Superchips tuner. use the search function at the top of each forum and you'll find lots of info on this.
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daveshotdak
Dodge Dakota
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7/28/2005
09:44:58
| RE: 3.9 lacks/looses power?
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My 2000 2wd 3.9 quad cab does bogs sometimes as well. i have a cold air, flowmaster 40 series, taylor wires, autolite double platinum plugs, iat mod, throttle body spacer. is there anything that i can do to fix the bogging?
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newbie-tuner
Dodge Dakota
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7/29/2005
15:54:23
| RE: 3.9 lacks/looses power?
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im definately gonna swap out my 3.9's tb with the v8, any tips or is it just remove gasket and bolt on?....any openining of the bore aside, im looking for a quick bolt on kick in the ass,
mods to date ,
3.9 99/sport long box st. cab(line-x bedliner)
cold air intake -(airraid)
bosch+4 plugs
flowmaster muffler
swap from 3:55:1- to 3:95?:1 rear diff
wider toyos
opened up the tail pipe , chromed the custom 3" pipes from the cat-back
anybody got any other quick-DRASTIC-hp mods to recommend?
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Luke
Dodge Dakota
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8/01/2005
09:42:07
| RE: 3.9 lacks/looses power?
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The TB is very simple. You just pull off the TB, pull the sensors off the old and put it on the new TB. As far as the gasket goes I have reused mine about 4 or 5 times, a new one is like a buck or so I am just to lazzy and cheap to go get a new one. The only prob you may have is the cable. I have heard that the V8 may use a diferant cable than the V6. You can go to the dealer and get a V8 cable or you can swap out the TB shaft. I have the F&B TB on my truck and I did not notice any diferance. So this kick in the a$$ do not expect it.
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Sweitz
Dodge Dakota
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2/16/2010
20:08:56
| 2003 loss of power
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I have a stock 4.7 4x4 quadcab Dakota with 120,000 miles on it. I love the truck but it has had gradually lost power and my gas mileage is now typically 13-14 mpg.
What are the first few things to check to bring back performance and mpg?
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codes
Dodge Dakota
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2/17/2010
12:02:38
| RE: 3.9 lacks/looses power?
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codes
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Frank
Dodge Dakota
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5/28/2010
10:06:12
|  RE: 3.9 lacks/looses power?
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Sweitz, i have an '02 dakota, put new oxygen sensors
on it and whamo, power and fuel went back up.
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suba suba
Dodge Dakota
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12/20/2018
11:45:06
| GmiRRjrjjHHhaRJFa
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HMNoFC This is certainly This is certainly a awesome write-up. Thanks for bothering to describe all of this out for us. It is a great help!
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