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ndhole
Dodge Dakota
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8/08/2006
21:08:51
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 Subject: Misfire 1998 3.9L V-6
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Wanting to see if anyone has had a similar problem and figured out how to fix it. I keep having a problem with misfires on multiple cylinders along with engine error codes for the same. I've taken it to a shop multiple times and no one seems to be able to figure out whats wrong with it and have went over it with a fine tooth comb, I have the garage bills to prove it. One shop seemed to think that the #1 fuel injector was bad since that cylinder seemed to be the one misfiring the most but it still ran the same afterwards. It never shows the same cylinders misfiring, it seems like they all like to have a turn. For the most part it runs fine but will start to dog and the rpms bounce while stopped with the air on or off, will dog and cut out at high speeds & low speeds, nothing you can really pin down and say that it only occurs when something in particular happens. I've about given up on it and am now at the point I'm hoping that someone will total it out for me so I can move on to something more reliable. It's been over 18 months and no one has a clue. There isn't much left to replace on it. I've replaced the coil pack, distributor cap & rotar, plugs, plug wires, fuel pump & other things I can't remember at this moment trying to fix it. I had to replace the engine 3 years ago with one from a 2001 after the last one seized up so this engine only has about 80,000 miles on it.
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Mike Stager
Dodge Dakota
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8/09/2006
00:34:24
| RE: Misfire 1998 3.9L V-6
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You need to get a vaccuum gauge on it and see what it is doing. If you get good vaccuum, then give it a quick burst of throttle, and watch the gauge. It should snap down and then return to normal vaccuum.
If it is sluggish, or doesn't move much, then you may very well have the common problem of a bad catalytic converter. Backpressure is probably what is causing your cylinder misfires. You may have a chunk in there that is moving around and causing the troubles.
While driving my Dakota, I've got performance problems where I'm not getting full power, and I can hear the motor skip every once and a while. I know my cat is bad, I am working on getting it replaced sooner than later ( just have another non working car that gets the funds poured into it first ).
It's amazing what you can tell about an engine just by watching a vaccuum gauge. I really just discovered its potential when I bought this truck.
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?
Dodge Dakota
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8/09/2006
10:32:46
| RE: Misfire 1998 3.9L V-6
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Was the O2 sensor (in front of cat ) ever replaced ?
Especially with a Bosch replacement ?
The Bosch replacement does NOT work well with
our trucks..
If never replaced = strong possibility of problem ...
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Obio3
Dodge Dakota
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8/09/2006
13:02:19
| RE: Misfire 1998 3.9L V-6
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Mike....You are so right about the vacumn guage. It is a great asset in repairing problems. The things it is able to tell you are unbeleavable. My guage was bought over 40 years ago and came with a book sporting pictures of guage action under differant conditions. Now days the scanner covers things pretty well but the vacumn guage still does and always will have it's place in a guys tool box. Your the first person I seen mention this guage.
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Obio3
Dodge Dakota
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8/10/2006
23:19:32
| RE: Misfire 1998 3.9L V-6
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Have you checked the distributer bearings. They could be wore out. Remove the dist cap and try wiggling the shaft.
So many probleme .... So little time
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Gregg
Dodge Dakota
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8/11/2006
18:24:06
| RE: Misfire 1998 3.9L V-6
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I feel your pain brother. Intermittent problems are the worst. You're not the only guy with an ongoing nightmare. Hopes and voodoo with every new part added to the list. Sophisticated electronics are the evil we fight. I chased a similar problem in an Accord that turned out to be the ECM or PCM or whatever freakin' H$NDA called it. That was a two-year treat with a stack-O-parts.
My neighbor's son is a real "white-coat" Ford engineer who works in Detroit with a lab of snotty mechanics. These guys have the best skills in the country for diagnostics. He visits and has spent hours tweaking his dad's '05 F150 for croaking to a dead stop often. The dad is looking into lemon laws as his son and the dealer gave up.
I hope whatever the monster is, he shows his head or breaks completely. Extended pain is torture.
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dak-jak
Dodge Dakota
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8/14/2006
16:22:28
| RE: Misfire 1998 3.9L V-6
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Message:
Try the Crank Pos. Sensor..
My 95 was doing similar and finally it got so bad
that it wouldn't idle properly at all , missing
which of course caused bangs in the exhaust.
Got anew one on today and perfect again....
Idles like a kitten....
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xmr2
Dodge Dakota
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8/15/2006
14:33:27
| RE: Misfire 1998 3.9L V-6
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I think dak-jak has it figured out. If not that it could be the hall effect sensor in the dist or a worn dist shaft.
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ndhole
Dodge Dakota
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8/15/2006
23:20:57
| RE: Misfire 1998 3.9L V-6
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Thanks for all the ideas, it'll give me a place to start. It shouldn't be the catalytic converter, I had it replaced about 3 years ago because the weld on the baffle inside it had come loose and I got tired of hearing it rattle all the time, mine didn't have the honeycomb in it, it has beads. As far as I know the first mechanic to look at it, who had it for 2 weeks, checked the vacuum and cylinder pressure and said both were fine which lead him to believe it was a bad injector. I also had the sensor on the bottom of the distributor shaft replaced because someone had said that if it went bad it could cause the problems I was having so I would have thought that he would have noticed if the bearings were bad but I'll have to give that a look again. What gets me is that it doesn't do it all the time, sometimes you can drive it for half a mile and it'll start up and then other times you can drive it all day and never have a problem.
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Jeremy
Dodge Dakota
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8/17/2006
20:45:05
| RE: Misfire 1998 3.9L V-6
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do you have the wire from the coil to the distributor ran on the correct side of the valve cover. there is a TSB out for this. it should be ran on the intake side of the head/valve cover. that might be a good place to start, easy and cheap.
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TranzAm
Dodge Dakota
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4/04/2008
01:03:05
| RE: Misfire 1998 3.9L V-6
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I have the same basic problem .. P0300 and the various cylinder codes which cause it. Been down the same road. Check, check, check, check, check, etc. and associated parts. I have checked ever sensor multiple times --- replaced the ECM. I have checked the Dodge forums a number of times looking for an explanation and no luck. The engine runs very smooth and idles very steady. Forget all this Chrysler tech bulliten BS because that is exactly what it is --BS. I've been working on this problem for about 18 months now and all I get are guesses -- no sensible logic or test procedure. I am now being told the heads are bad. I personally think it is a horrible eprom software program. If the engine is actually misfiring ... why do I never hear or feel it? I will say one thing --- This is the last Chrysler product I will ever own.
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Stoneslinger
Dodge Dakota
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4/07/2008
06:38:40
| RE: Misfire 1998 3.9L V-6
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This could be related to poor fuel quality, too much methanol. Do use any more than 10% methonal, many stations are useing upto 25%. Read the pump before you fuel up make sure its 10% or less. Regular gas is fine no need to waste $$$ on premium.
I would also change both oxy sensors and cat, this will pay you back in fuel saveings if your milage has been declining.
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Leroy
Dodge Dakota
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7/02/2010
13:29:40
| RE: Misfire 1998 3.9L V-6
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Message:
My 98 dodge dakota was running good until I changed
plugs and plug wires now it sounds like a vacuum
leak. After I get up to about 40 miles an hour it
runs pretty good but if I slow down or stop. It runs
rough and sometimes dies
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