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Mike
Dodge Dakota
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5/08/2002
23:06:19

Subject: 3.9 engine noise
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I have a 2001 3.9 liter Quad cab. Shortly after I purchased it I noticed that the engine was noisey, especially at low speeds. It sounds like there is a "sewing machine" running under the hood. As I speed up, so does the noise.
My wife has a 3.0 Intrepid and the engine is very smooth. When I asked the dealer about the sound they just dismissed it.
So is the 3.9 engine just noisey, and somthing I should put up with? Or could it be something else?

Thanks!



Texas97
*GenIII*
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5/09/2002
03:44:01

RE: 3.9 engine noise
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Yeah, in my experiences it is just noisy. The pulleys are loud and the injector clicking is very loud too. I have just learned to live with it and i dont ever have a problem with it. I think it is normal... this is the second Dak i've had like this.

Kick the tires and light the fires!
97 Dakota CC 3.9L 5 speed
Mods: A lot of fun stuff

Zaurusman
GenIII
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5/09/2002
13:53:44

RE: 3.9 engine noise
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Mine's like that too; I actually kinda like it.

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Zaurusman
'98 RC Red Sport V6 5spd 3.21 15x8's
http://home.earthlink.net/~tiborkun/Dakota/Index.htm

MikeW
Dodge Dakota
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5/09/2002
16:45:34

RE: 3.9 engine noise
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I have a 2001 3.9 Club Cab and it is quiet.
It is quieter than my 1999 4.7 Grand Cherokee Limited. Go figure...



kotadude21
Dodge Dakota
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5/09/2002
22:22:02

RE: 3.9 engine noise
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I also have a strange noise from under my hood on my 3.9L. It's a 97 and it sounds kinda like the belt tensioner. It usually does it when it's warm and i have it in drive
If I slip it into neutral it goes away.

anyone think i can do anything about it. I haven't had anyone look at it. Just sounds like an old clunker when i'm stopped at a traffic light.

brent

www.geocites.com/kotadude21



91 dodge
Dodge Dakota
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5/10/2002
03:44:43

RE: 3.9 engine noise
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mine does to. check the tensioning pulley at the TOP... it is to the right i believ of the (75 amp) alternator, the bearings get thirsty and need the occasional WD-40.



Alan
Dodge Dakota
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5/13/2002
02:33:40

RE: 3.9 engine noise
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And I thought I was the only one. I don't have the sewing machine noise, but I have rather noisy rocker ar clicking and the clicking injectors. I can always tell when it's time to change oil,,,my rocker start sounding off. BTW I run 10w-30 and Fram.



JimB
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5/13/2002
07:50:45

RE: 3.9 engine noise
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Is it like a "clicking" sound? You said it "speeds" up as you do. My 3.9 (twice now) has had to have the bolts tightened at the manifold (those that connect your tailpipe). They were loose enough to cause a clicking sound.

99 SY 3.9 Dakota Sport
99 PB 5.9 Durango SLT

dave amaral
Dodge Dakota
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1/28/2009
08:41:15

RE: 3.9 engine noise
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gentle men heres tha real problem with your trucks it is the timing chain they used very cheap chains in the 3.9 if u buy a timing chain with the optional chain tensioner the noise goes away i promise or i will buy the parts and pay the abor common prob with mopar heres the other issue if you dont change it and it snapps which is very likely the motor is finished.. the good thing about the new chain and tensioner is that you can install it with the cam timing straight up and you get so much low end power it makes you feel like you put a v8 in it.. cloyes makes the chain and tensioner in a kit together and is priced at $190.00 if you have any more questions feel free to ask davam99@yahoo.com ps this priject could be down by yoursefs in 2 hours tops with you basic hand tools plus a harmonic balancer puller ....DAVE



Texas97
*GenIII*
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1/28/2009
09:45:08

RE: 3.9 engine noise
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Good lord, 5 years since i posted in this thread!!

Here is the real problem, Dave. The V6 engine we have in the Dakota is not balanced properly for a V6. Its an older technology engine that has been around since the 60's because its a 318 with the last two cylanders lopped off. The proper piston angle for a V6 to balance would be at 60 degrees, whereas the 3.9 is at 90 degrees, just like its V8 brother.

I have installed a comp cams double roller with tensioner many years ago, probaby like 6 years ago.( holy crap, cant believe i still have that truck) The noisyness of the engine doesnt go away with the new chain, but you dont get the chain slap at the front of the engine that you got before.



Gig 'em Ags!
Kick the tires and light the fires!
97 Dakota CC 3.9L 5 speed


dave amaral
Dodge Dakota
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1/28/2009
23:23:46

RE: 3.9 engine noise
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my 97 with 50,000 purs like a kitten no noises is your a lifter prob but every thing you said i know about the 318 chopped i have been working at a dodge dealer for 20 years



mario
Dodge Dakota
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2/11/2009
11:20:26

RE: 3.9 engine noise
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as is for the whole spray the bearings with wd-40 thing....explain to me how wd 40 stops the squeek on a sealed bearing....



dave amaral
Dodge Dakota
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2/11/2009
13:07:36

RE: 3.9 engine noise
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it doesnt mario just replace them there not that exspensive and most of all its not hard to do



mario
Dodge Dakota
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2/13/2009
01:20:31

RE: 3.9 engine noise
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why thank you dave,finally somebody else that knows something about cars. not that i know everything cause believe me i dont but damn....wd 40 on a sealed bearing....thats just common sense.



mario
Dodge Dakota
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2/13/2009
01:25:08

RE: 3.9 engine noise
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another thing....if you say the noise speeds up as you do it would be something in the drivetrain....bearings ect....if it is the timing chain it would speed up with the tach not the truck.



dave amaral
Dodge Dakota
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2/13/2009
03:43:50

RE: 3.9 engine noise
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correct sounds like wheel bearings if it makes more niose with speed the motor being noizy is very common for the 3.9 plus if you havent done the chain i would to get it out of the way



Garritt
Dodge Dakota
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2/13/2009
06:49:39

RE: 3.9 engine noise
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i have a 1999 dakota v6 with the O2 sensors bypassed and a straight pipe, i couldnt tell if my engine would be making sewing machine noise all i can hear is her roar and boy is it purty.



jedd uytt
Dodge Dakota
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2/05/2013
21:30:56

RE: 3.9 engine noise
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My 88 3.9 with 160,000 mi.is so noisy on the upper end that I put diesel emblems on my truck so people will think (Oh it's a diesel that's why it's so noisy. Works good for me!!



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