Dodge Dakota truck wont idle

Tiny
NERDYSHIRT
  • MEMBER
  • 2000 DODGE DAKOTA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 130,000 MILES
I have a 2000 dodge dakota truck that will run if you keep your foot on the gas but will not idle. We tried replacing the map sensor, fuel pump relay, and throttle position sensor.
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Monday, March 7th, 2011 AT 1:27 AM

3 Replies

Tiny
CARADIODOC
  • EXPERT
When the battery is run dead or is disconnected, the Engine Computer loses its memory. It has to relearn "minimum throttle" before it will know when to be in control of idle speed. To meet the conditions for the relearn to take place, drive at highway speed with the engine warmed up, then coast for at least seven seconds without touching the brake or gas pedals.
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Monday, March 7th, 2011 AT 1:44 AM
Tiny
NERDYSHIRT
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Thanks for your help, we'll give that a shot. One thing though, could we just use a jack to raise the backend off the ground and run it that way or does it need to be on the road? We're just worried about getting stranded just in case the truck stalls after we let our foot off the gas and coast.
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Monday, March 7th, 2011 AT 2:53 AM
Tiny
CARADIODOC
  • EXPERT
Nope, won't work. The Engine Computer needs to see high intake manifold vacuum for seven seconds. You can force high vacuum by snapping the throttle then quickly releasing it. The vacuum will go high but just for one or two seconds. The only way to make high vacuum for seven seconds is by coasting down from highway speed. That is the proof the computer needs to know your foot is off the gas pedal. At that point it will take a voltage reading from the throttle position sensor and put it in memory. From then on, anytime it sees that same voltage it will know it has to be in control of idle speed. Running it jacked up won't do it because there isn't enough mass in the wheels and tires to pull the engine for seven seconds and to create a high enough vacuum. You don't have to worry about it stalling on the highway. If it quits while you're cruising, that is a whole different problem not related to low idle speed.
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Monday, March 7th, 2011 AT 3:08 AM

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