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Pickups Pickups - Archived Discussions Dodge Dakota Crew Cab - III 
475 messages, Last post on May 29, 2000 at 1:14 PM
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My 2000 Dakota 4.7V8 used to exhibit a 'hunting' idle for up to 6000 miles. My symptoms were ALWAYS seen when the road-speed was above 0.0 MPH. (As soon as I came to a complete stop, the idle would 'lock in' at the proper setting.) I brought this up to the dealer several times and each time they reported that the idle speed was correct. (The boneheads ignored the problem.) I have the DODGE shop manual and have read thru it several times. The on-board computer has a 'fuzzy logic' algorithm that allows it to 'learn' certain settings (IdleSpeed, Ignitiontiming, InjectionPulsewith...etc) These settings are stored in memory based on a SIMILAR CONDITIONS WINDOW. (AirTemp, Humidity, BatteryTemp, ExhaustTemp, AidDensity, RoadSpeed ...etc) These are stored in both short-term and Long-term memory and included in the algorithm for learning. Given this knowledge, I realized that the onboard computer needed time to 'adjust' to different conditions and 'learn' the best way to idle under these conditions. I found that I could speed up the learning process by allowing the computer time enough to figure out how to idle. I began to hold the clutch in on long down-hills coasting along between 35-50 MPH. At first, the idle would 'hunt' for over 40 seconds before beginning to settle into a constant speed. After several 'teachings' over the course of a week, The idle began to 'learn' faster and settle into a solid speed much faster when I held the clutch in. The occurrence of stalling was reduced too. Now, I have about 9000 miles on my Dakota and just for fun I held the clutch in for several minutes down a long hill yesterday...NO HUNTING AT ALL. I attrubute this to the onboard computer having learned how to idle under those conditions. (The long-term SIMILAR CONDITIONS WINDOW has some real data in it now) Do not get me wrong... I still experience an occasional stall but this is usually during slow manovers. (Such as backing up a short hill) Rarly, after such a manover, When I push the clutch in, the idle drops to almost nothing and somtimes the engine stalls. I hope this information is what you were looking for. Does any of this sound simular to your experience with your Dakota? |
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Just to add to bpeebles - 'problems' with the computer not really knowing how to react are really connected to situations that the truck hasn't experienced very much. Initially this is everything of course, but the truck soon gets used to common events. By making uncommon events more common we can help the truck to learn how to behave - that is why bpeebles clutch down coasting works well. I had a problem with warm reversing, but solved it by reversing into the garage at the end of the day for a while rather than reversing out in the morning. Incidentally, much has been made of the polite and friendly attitude of the Dakota topics, but I saw a trend a few posts back that I think we should continue - b peebles was referred to as Mr. Peebles. I think in future you may call me Mr. Jordan, Sir, God - well you get the idea  Have a pleasant break for memorial day my friends, and regards to all my fellow veterans and current servicemen. |
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For purposes of efficiency.... this topic has been "frozen." Please continue these discussions in Topic 1934 Dodge Dakota Crew Cab - IV. Thanks! Front Porch Philosopher SUV, Pickups, & Aftermarket and Accessories Host |
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