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Brad
Dodge Dakota
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5/01/2007
19:47:50
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 Subject: 3.9 liter misfiring and stuttering
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I have a '01 Dodge dakota 3.9 liter 105,000 miles. About 2 weeks ago i pulled out into traffic and i had no power and it was misfiring. Its sporadic.The dealership ran the code and told me it was a O2 sensor, bank 2 sensor 1. I replaced the 2 upstream O2 sensors. No check engine light. Still having the same problem. The truck was tuned last winter. Any ideas guys
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daddio
Dodge Dakota
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5/01/2007
20:00:36
| RE: 3.9 liter misfiring and stuttering
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Message:
check fuel pressure. do you have any other codes?
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Problem Child
GenIII
5/01/2007
20:11:34
| RE: 3.9 liter misfiring and stuttering
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Message:
Replace all 4 O2 sensors, rear cat clogged.
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Problem Child
GenIII
5/01/2007
20:18:55
| RE: 3.9 liter misfiring and stuttering
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Message:
Daddio is right check fuel pressure, could be fuel pump, but with that many mile need all 4 O2 sensors anyway. www.ngk.com for sensors
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comp
Dodge Dakota
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5/01/2007
22:06:17
| RE: 3.9 liter misfiring and stuttering
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Message:
reset the computer after the 02 change?
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J and J Auto
GenII
5/02/2007
00:17:19
| RE: 3.9 liter misfiring and stuttering
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Message:
check the cat it may be pluged this will cause a
big loss of power
What you need to do is find a good shop and have
them watch all the sensors with a scanner to see
what is going on
Also you can have a pending code that will not
light the mil malfunction indicater light
posible
crank sensor
dist pickup
bad coil
check the conections on these 3 things
Larry
J&J Auto
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P2gee
Dodge Dakota
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5/03/2007
19:23:10
|  RE: 3.9 liter misfiring and stuttering
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Message:
I would check into replacing the fuel filter/regulator especially if fuel pressure checks low. Mopar claims this is a no maintainence item due to less fuel flow from returnless FI. But field experience has proven otherwise and Mopar now offers offers it as a serperate part. Replace mine at 60k and it was in pretty bad shape. Before you go to the trouble of pulling the tank to replace, you might want to have a tech do a current ramp on the pump to check pump motor condition. If the motor looks bad, you might as well go ahead and replace the pump module as it includes a new filter/regulator.
Good luck.
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crank sensor
Dodge Dakota
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5/07/2007
21:12:26
| RE: 3.9 liter misfiring and stuttering
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Message:
mine was a cheap wells cranksensor
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J and J Auto
GenII
5/07/2007
23:42:16
| RE: 3.9 liter misfiring and stuttering
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Message:
You have to be carful were you get your sensors
they are not all created equal
I recomend getting all the sensors from the dealer
like map, tps, crank dist pickup, the o2 the
ngk ntk is what the factory instals and is cheaper
buying direct from ngk.com
On the temp sensors IAT, guage and engine temp
the wells will work this is just a variable
resistor but the others do have a distinkt scope
pattern the computer reads
Most of the well temp sensors are within 5 degrees
and will work fine
Larry
J&J Auto
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Detori
Dodge Dakota
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5/09/2007
13:50:05
|  RE: 3.9 liter misfiring and stuttering
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Message:
Is changing the crankshaft position sensor an easy job? What does this sensor cost?
99 Dakota 3.9 V6 4x4
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hi
Dodge Dakota
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5/09/2007
23:47:25
| RE: 3.9 liter misfiring and stuttering
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Message:
I have a 1998 3.9 Dakota 180,000 doing the same thing. I have a p0420 Code. After drivig for 15minutes or more then I turn off the truck for 5 minuts and start it back up after about 3 tens of a mile it would start to have no power with my foot and the pedal and would backfire and after I take my foot off the gas 2 to 3 times it would clear up and does not come back
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roger
Dodge Dakota
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5/15/2007
21:24:11
| RE: 3.9 liter misfiring and stuttering
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Message:
this is to HI and who ever can help us please!!!!! my truck is doing the same thing exac.tly code and all i have a 2002 with the 3.9 i realy would like some one to solve this problem
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windak03bill
Dodge Dakota
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5/18/2007
05:39:45
|  RE: 3.9 liter misfiring and stuttering
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Have your dealer / mechanic check the engine harness, my dads ram van with a 3.9 melted the harness, and it started pulling the same problems until the harness got changed after that it ran like new
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Hi
Dodge Dakota
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5/18/2007
17:43:29
| RE: 3.9 liter misfiring and stuttering
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Roger I replaced my downstrem o2. It strill does the same thing. Next I am going to change all the spark plugs. If it still does it I will replace the Cat.
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roger
Dodge Dakota
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5/18/2007
22:23:05
|  RE: 3.9 liter misfiring and stuttering
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Message:
hi
the first time mine did that i replaced the cap rotor plugs and wires and it still does it. sorry roger
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roger
Dodge Dakota
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5/18/2007
22:27:03
| RE: 3.9 liter misfiring and stuttering
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windak
can you tell me where it was melted so i can check it
thanks
roger
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Hi
Dodge Dakota
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5/19/2007
11:23:15
| RE: 3.9 liter misfiring and stuttering
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Message:
Roger
So today when my hood was up a started my truck and about 15sec later it started to mis and sounded like there was a air leak sound and the sound was coming from the passenger side of the engine by the manifold later on looking closer i notice that one of my bolts that holds on the manifold was missing and you could stick a pen right into it. SO i went to a local shop and they said that could cause the code p0420 to come on it messes up the readings of the o2 senors since there is that hole in the part of the exhaust. I am going to fix that next.
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windak03bill
Dodge Dakota
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5/20/2007
03:03:42
| RE: 3.9 liter misfiring and stuttering
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umm well if its the same as the ram vans, it should be on the right side the harness will come close the the exhaust manifold joint to the cat, right in there, the way ours looked was it melted the casings, and the wires were touching shorting some of them out
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Kyle Heinecke
Dodge Dakota
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5/21/2007
20:18:43
| RE: 3.9 liter misfiring and stuttering
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now i have a 1993 dakota with the 3.9 and mine is the first year they made this modification but to make more power dodge took and ported the valves so large that the metal between the valves would crack, resulting in lose of compression on that cylinder, so check your compression i had to replace my one head as soon as i bought my truck, and the first junkyard replace ment i looked at was cracked too. so check your compression
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wjones7405
Dodge Dakota
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5/21/2007
21:29:24
| RE: 3.9 liter misfiring and stuttering
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Check the upper bushing on your distributer..I'll bet you'll find it to be worn..Shake it from side to side should be no movement at all.. If there is it is worn..
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roger
Dodge Dakota
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5/21/2007
21:38:09
|  RE: 3.9 liter misfiring and stuttering
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Message:
well guys i will be looking at these things hopefully this weekend. when i start my engine some times i here a vacuum leak, but this is the leak dector pump doing its thing. i clamped off the vac hose to see if that was causing the problem. well it didnt because while i had the hose clamped it did its sputtering thing. so we will have to keep trying.
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