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cb
Dodge Dakota
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5/26/2007
22:46:03

Subject: 2002 dakota 4.7 v8 idle
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FOr a while now, my dakota has been idling funny. It happens when I am in park or in drive at a complete stop. The rpm gauge will go up and down, maybe within 300 to 500 rpm and I can hear the engine idling erradically (up and down) as well. It almost seems like it's choking, stutters, then go back, the repeats this process. I tried to pinpoint times of occurance, but truthfully it happens about 70 to 80% of the time, regardless of engine temp or cold starts. Well, maybe I would say it does it a little more during a cold start. Anyway, any tips before I set out to figure it out. maybe computer? or fuel line? or maybe something stupid like a faulty gas cap? Theres too many sensors and electronically controlled things on these newer trucks, so what might have been a simple fix turns into a headache. Also, I checked the air filter and that was clean as a whistle.



TexasTodd
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5/27/2007
05:03:07

RE: 2002 dakota 4.7 v8 idle
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Try cleaning or replacing the TPS sensor.



Kowalski
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5/28/2007
09:01:25

RE: 2002 dakota 4.7 v8 idle
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Clean or replace IAC. The idle air control is more likely to be the problem than the throttle position sensor.

Lead, follow, or get out of the way

Dan M
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5/29/2007
12:58:26

RE: 2002 dakota 4.7 v8 idle
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My 02 QC 4.7L 4x4 has recently started doing this when I start it up when it's cold. After it warms up and I turn it off and re-start I have not seen this issue.

- Dan M



daddio
Dodge Dakota
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5/29/2007
13:23:24

RE: 2002 dakota 4.7 v8 idle
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Dan M, do you happen to still have the original battery in your truck? if so, you may want to have it load tested. a weak battery will cause the symptoms you described.



dick
Dodge Dakota
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5/29/2007
14:11:53

RE: 2002 dakota 4.7 v8 idle
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had what sounds to be exactly the same bouncing idle problem in my 2000 4.7 a few years ago. replaced the TPS, as TexasTodd suggests, and that immediately corrected the problem. the new TPS cost about $25.00 and took about 5 minutes to replace. great fix...



CB
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5/29/2007
20:55:46

RE: 2002 dakota 4.7 v8 idle
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Hey. Thanks for all the suggestions. I will definitely check those things out. I been away for the holiday weekend, but now I gotta figure this problem out. I will keep you all updated.



Dan M
Dodge Dakota
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5/30/2007
05:59:04

RE: 2002 dakota 4.7 v8 idle
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I'm going to plug my scanner in and watch the RPM and other sensors when cold. That should tell me what the problem is. I've been busy with out of town guests this past holiday weekend to spend any time on it. I was thinking the MAP sensor myself. I will check out the battery. Yep, it's the original mopar one.

- Dan M



CB
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5/30/2007
12:49:25

RE: 2002 dakota 4.7 v8 idle
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First of all, I want to give a big thanks to all you for your help. After doin a little research on this and other dakota forums, I decided to replace the tps (throttle position sensor). I went to Auto Zone. They had the part in stock...was about 45 bucks. Now, from my original post, all the original problems seemed to disappear. Idles fine now. I would even say it shifts nicer, too and no stalling when I shift into gear. Forgot to mention I was also having a problem stalling sometimes when I shifted into gear (auto trans.) I would also say that it's running smoother overall (using 50-55 mph as an indicator, it seems that the rpm's are a little lower). Hell, maybe I'll even get better gas mileage. Well, anyway, here's the run-up of what I did.
I replaced the tps. This is the highest sensor mounted on the throttle body on the right side of truck (facing front of truck) The part number from Auto Zone is TPS333 and the url for the web page is...(cut and paste) http://www.autozone.com/R,APP267806/vehicleId,2720002/initialAction,partProductDetail/store,5262/partType,00136/shopping/partProductDetail.htm

The replacement comes with two gaskets and two new bolts. You'll only need one of either gaskets depending on application. For my 2002 4.7 v8, i needed the o-ring one. I disconnected harness from old one, took out the bolts and removed. (by the way, no parts to worry about falling off. Just the o-ring on mine seated around the tps.
re-installed new one with new bolts and new gasket and re-connected harness. This took about 2 minutes. I then reset the pcm as suggested in another post. this i did as follows...
"if you replaced your TPS, you're going to have to reset your PCM. The procedure for this is:
1. Disconnect + battery cable.
2. Turn ignition key to "start" position and hold for 20 - 30 seconds.
3. Reconnect + battery cable.
4. Start engine, do not touch accelerator pedal.
You'll need to drive your truck a few hundred miles so your PCM can relearn all your sensor parameters. Depending on your daily driving habits, this could take a week or so.
The surging should stop immediately if your TPS was the problem. The learning period sets your base idle voltage from the TPS and all around throttle response should improve as you put the miles on your reset PCM.
If you haven't removed and cleaned your throttle body yet, doing that prior to going through this procedure would benefit you the most.
If you do clean your throttle body, don't forget to remove the IAC motor (that cylindrical thing mounted below your TPS) because there's usually a lot of sludge in the oriface that the IAC motor fits into.
I got this info from this post on this url compliments of Rob C...
http://www.dodgedakota.net/boards/v8/5882.html



CB
Dodge Dakota
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5/30/2007
12:59:55

RE: 2002 dakota 4.7 v8 idle
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Also, forgot to mention. I put a bottle of stp fuel injector cleaner (the black bottle) into a full tank of gas...just another thing mentioned somewhere that I figured couldnt hurt.



John Esparza.
Dodge Dakota
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8/16/2013
02:02:02

RE: 2002 dakota 4.7 v8 idle
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I just wonder if this would work for my 2002 dodge Dakota. Six
cyl.this mess is making swear off most of the time,please tell
me that this is my problem too!,



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