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marlow
Dodge Dakota
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3/20/2004
10:59:28

Subject: Rolling idle....
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Changed rotor/cap plugs and wires last night and also thoroughly cleaned throttle body and sensors....started the truck this morning and it now has a rolling idle. Not sure what would cause this...anyone have any input?

'03 QC 3.9 V6



marlow
Dodge Dakota
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3/20/2004
11:30:22

RE: Rolling idle....
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Drove the truck and it seems like it is giving itself too much gas. Its shifting funny, like when you come to a stop it wont down shift until you are almost stopped. Sitting at a stop light if I let off the brakes it would take off on its own. As i put it into park the idle stays really high. I will check the TB sensors and go from there. Any help from anyone would be greatly appreciated. Thanks

On the brighter side, the throttle response is significantly better...although if i wasnt paying attention the truck would leave without me!



daffydak
GenIII
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3/20/2004
12:56:37

RE: Rolling idle....
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how high is the idle?? do you mean fluctuating by about 300 rpm (700 to 900) mine did that after my tb swap. you may want to reset your pcm, then you start it let it idle for about 30 seconds (do not toutch the gas pedal) shut it down start it again for about 30 seconds (don't touch the gas) shut it down again. then you can start it and take it for a drive.
the purpose of the restarting is to "teach" the pcm the baseline idle. correct me if i'm wrong (larry) it can take around 200 miles for a long term "learn" so be paitent after the reset.

just my .02

Dan

mopar=mopower

marlow
Dodge Dakota
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3/20/2004
13:50:47

RE: Rolling idle....
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My guage cluster doesn't work at the moment so i cant tell exactly what the idle is or pull any codes.
When i start it, it will idle about normal for 10 seconds and then pick up idle about 100rpm and then 5 or 10 seconds later it will pick up again by about 100rpm. Its got to be running around 900-1000 by the time it levels out. At first it was kind of loping/rolling at low rpm but that has stopped. When you shift from park to drive the idle jumps and the engine revs back up.
I was thinking maybe the IAC but dont know for sure.

I tried the starting for 30 seconds but no change. I will drive it to see if it will relearn the idle but the shift points being off is somewhat concerning to me.

Thanks for the tip...



citras
Dodge Dakota
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3/20/2004
15:11:09

RE: Rolling idle....
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throw a stall converter on it. :)



marlow
Dodge Dakota
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3/20/2004
16:29:39

RE: Rolling idle....
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Thanks.

Anyone else...? throw me a bone here....

The truck is almost running like a manual. Driving on the highway and let off the gas at 65 and you can feel the engine/trans slowing the truck. Almost feels like the torque converter is locked and the engine/trans? is trying to keep up. At a stop light you have to hold the brakes to keep the truck from lunging forward. Its very torquey in the lower gears and down shifts when coasting. Wont downshift to first until you've come to almost a complete stop. Throw it in park and it revs at least 300-500 rpm and idles there.
I guess I'm at a loss as to what happened while replacing rotor/cap and cleaning TB.
Could the TV cable need to be adjusted? The throttle doesnt move when it is idleing which makes me want to think IAC.




marlow
Dodge Dakota
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3/20/2004
20:42:26

RE: Rolling idle....
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Hey Larry, you seem to be "the man" around these parts...help me out.......



GB2000
GenIII
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3/21/2004
02:10:26

RE: Rolling idle....
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Here's my guesses...I'm not real experienced in troubleshooting though so these may not be even close.

1.) One of your sensors got messed up when you were cleaning the tb
2.) Torque converter stuck in lock-up (could that do it?)

I think if you unplug the IAC your truck would still be driveable, but it wouldn't idle... if that's right, you could unplug the IAC and take the truck for a spin out on a country road at highway speed and see if it acts up like it currently does on the highway. I don't think that would give you your non-idling problems, but it could be guilty of your idling problems. Also, I wouldn't think it'd be the tv cable if you didn't mess with it...if you messed with it while your tb was off, it COULD be it though. Moving it even a mm off can sometimes make your tranny go nuts. Have you had anyone scan it for codes yet? That should help... also figure out how to test all your sensors and stuff.

Before you do all that, I would recommend doing what Dan said to do about resetting the PCM.

Josh

Red 98 RC V6 2wd Single in/dual out exhaust (soon to be switched to a flowmaster 40 single in/dual out), s-bolt "mod", Edelbrock 10" round air cleaner w/ K&N air filter, removed rubber flap...and more to come

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