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Discussion Starter #1
I have a 98 dakota with a 3.9 in it, and i have been having problems with it idling. When the truck is completly cold it will start up and idle fine, however if you shut it off and try to start it back up while it is still warm it doesnt want to idle. If you pull the negative battery terminal off and reset the ecu, it will run fine for awhile then start doing the same thing. I cleaned the iac port on the throttle body and replace the iac valve (with a used one i had laying around) it ran fine for awhile then started doing the same thing. Anyone have any ideas what it could be? Should i try replacing the iac with a brand new one?
 

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Discussion Starter #3
Sounds like your TPS sensor has taken a crap.
I tried changing the tps sensor and still does the same thing. Starts up and idles fine when cold, but if you start it warm it wont idle. I can give it some gas and it will eventually clear up and idle. Seems like it loads up a bit when it does this because i can smell the fuel.
 
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How long has it been since you removed and throughly cleaned the TB, especially the IAC port and tip of the IAC sensor?
 

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Discussion Starter #5
How long has it been since you removed and throughly cleaned the TB, especially the IAC port and tip of the IAC sensor?
I did that not too long ago. I didnt take the throttle body off, but i pulled the iac, cleaned the port and the valve. I also replaced the iac valve with another i had laying around, still ran the same.
 
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I did that not too long ago. I didnt take the throttle body off, but i pulled the iac, cleaned the port and the valve. I also replaced the iac valve with another i had laying around, still ran the same.
You can't throughly clean the TB unless you take it off. About $5 for a new gasket and a can of spray carb cleaner and about 45 mins of your time.
 

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Discussion Starter #7
Next Decent day we have i'll put the tb off and clean it throughly and go from there.
 

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Discussion Starter #8
Well I went a head and changed the tb with a v8 one i had laying around. Cleaned it all up and installed a new gasket with it. Truck ran good for a few days but is now starting to do the same thing again.
 

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Discussion Starter #10
did you replace the sensors or put the old ones back on?
I have a few iac and tps sensors and i tried swapping them before i even messed with the tb.
 

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Discussion Starter #14
Sounds like you may have to spring for a new IAC sensor.
Yeah that was next on the list lol. Just wanted to make sure before i buy a new one.
 
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