1999 Dakota 3.9 Idle/Stumbling Issue - Dodge Durango Forum
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post #1 of 13 Old 06-24-2010, 12:44 PM Thread Starter
dakrt360a
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1999 Dakota 3.9 Idle/Stumbling Issue

I'm looking for some advice here...

The issue I have been having the last few months have been occasional to frequent rough idle. This seems to be drastically worse in the presence of moisture, say the morning after a nightly storm. For instance, after a rain last night, the truck started fine but idled very rough. Normally once I start driving and after a few miles it tends to calm down and run normal. Sometimes it will feel like it is missing and stumble a bit while at speed.

I have already tried the usual IAC replacement, spark plug replacement etc. After reading some of the posts on here I have heard possibilities like fuel pump, computer, o2 sensors, etc. Any input will be welcome. Thanks.
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post #2 of 13 Old 06-24-2010, 03:06 PM
vortmax
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You mention plugs. Did you replace the wires too? Are they routed properly? I believe there is a TSB out for an alternate wire routing for 3 and 5 to solve an issue like this.
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post #3 of 13 Old 06-27-2010, 03:01 AM
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I also have a 2000 Dakota with the 3.9 and often notice that it idles high and sometimes rough for about 10-15 seconds when I put it in park (up around 2000 rpm). Doesn't happen all the time but enough for me to be curious about how to make it stop. I notice it the most after towing a trailer or if I throw it into park quickly.

While Im trouble shooting, my truck also makes a rather loud clicking noise when it gets wet. When the engine gets wet from going through even the smallest puddle it makes a loud clicking noise from the front. When it dries out a minute later its quiet again. Any ideas what that is? It makes the small amount of off roading I do very annoying and driving in the rain is also getting to be a nuisance. I just don't like the noise and wonder how I can make it stop. Hopefully someone on here can help us out.
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post #4 of 13 Old 07-06-2010, 08:00 PM
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bump*
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post #5 of 13 Old 07-06-2010, 08:37 PM
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First, I would recomend making your own thread instead of piggy backing a question onto someone else's thread.

Second, pull the truck into a dark garage or wait until night time, start it up, pop the hood and mist around the plug and coil wires with a spray bottle. That ticking sounds like a wire or wires arcing to the block. If you see visible arcing, replace your wires and route them correctly.
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post #6 of 13 Old 07-07-2010, 12:36 AM
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Quote:
Originally Posted by dakrt360a View Post
I'm looking for some advice here...

The issue I have been having the last few months have been occasional to frequent rough idle. This seems to be drastically worse in the presence of moisture, say the morning after a nightly storm. For instance, after a rain last night, the truck started fine but idled very rough. Normally once I start driving and after a few miles it tends to calm down and run normal. Sometimes it will feel like it is missing and stumble a bit while at speed.

I have already tried the usual IAC replacement, spark plug replacement etc. After reading some of the posts on here I have heard possibilities like fuel pump, computer, o2 sensors, etc. Any input will be welcome. Thanks.
My truck has had this problem twice. First time it was an 02 sensor, second time a full tune up fixed the prob, Plugs, Wires, cap and rotor.

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post #7 of 13 Old 12-13-2010, 07:10 PM
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Quote:
Originally Posted by dakrt360a View Post
I'm looking for some advice here...

The issue I have been having the last few months have been occasional to frequent rough idle. This seems to be drastically worse in the presence of moisture, say the morning after a nightly storm. For instance, after a rain last night, the truck started fine but idled very rough. Normally once I start driving and after a few miles it tends to calm down and run normal. Sometimes it will feel like it is missing and stumble a bit while at speed.

I have already tried the usual IAC replacement, spark plug replacement etc. After reading some of the posts on here I have heard possibilities like fuel pump, computer, o2 sensors, etc. Any input will be welcome. Thanks.
Bringing this up from the dead.

I had this same issue this morning. Yesterday it was pouring. Today on the drive to work I notice the RPM's bouncing around when I'm in traffice and in Drive. If I shift to Neutral it's fine.

Haven't replaced anything thus far. Curious to see whether you found anything wrong.
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post #8 of 13 Old 12-20-2010, 12:03 AM
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hello, I have the same problem, 2000 dakota 3.9L when I put it into park its a rough idle and almost wants to die, and sometimes does. It got to the point where it wouldn't keep an idle, I did the IAC and it fixed the problem, but not completely, it doesn't do it as frequent. I have a Cervini's hood with scoops and I think it might be because of the water too. I tried pulse plugs and changed spark plugs and same problem, but I have not replaced the wires. I do have an engine light on and says small evap leak and large leak, so maybe thats it and might work for other dakotas. I am still looking for the leak and even had it on a hoist and had a mechanic look at it. and he couldn't find anything.
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post #9 of 13 Old 10-11-2012, 04:34 AM
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FYI I replaced the plug wires as well as the cap and my moisture related issues have gone away completely.

I tried changing my plugs but they were stuck and one of them started to strip out.
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post #10 of 13 Old 04-17-2013, 05:05 PM
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Quote:
Originally Posted by Underwhere View Post
Bringing this up from the dead.

I had this same issue this morning. Yesterday it was pouring. Today on the drive to work I notice the RPM's bouncing around when I'm in traffice and in Drive. If I shift to Neutral it's fine.

Haven't replaced anything thus far. Curious to see whether you found anything wrong.
OMG! This is exactly what mine has done. I have changed the PVC, Iac, Plugs and now am about to change out my wires (The only reason I didn't do the wires was because they look new) also changing the Dist Cap and the rotor. Thats this weekend. Hope it isn't the o2 sensors cause I won't replace those until I have my CAT replaced.
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post #11 of 13 Old 04-28-2013, 06:13 PM
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I know on my 97 V6 the brake booster comes awfully close to the valve cover and my wires for the 4th and 6th cylinder were scrunched up and the heat from the engine actually cracked one and they were arcing. make sure they're all in a good spot


Dodge 'till the day I die...
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post #12 of 13 Old 04-28-2013, 06:29 PM
Izzy's 00 Dak
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Originally Posted by Izzy's 00 Dak View Post
OMG! This is exactly what mine has done. I have changed the PVC, Iac, Plugs and now am about to change out my wires (The only reason I didn't do the wires was because they look new) also changing the Dist Cap and the rotor. Thats this weekend. Hope it isn't the o2 sensors cause I won't replace those until I have my CAT replaced.
Yep. So I finally got around to getting done what I wanted. Switched out the wires, dist. cap and the dist. rotor. Completely solved my issue.
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post #13 of 13 Old 04-28-2013, 06:33 PM
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sweet


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