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Dodge Dakota throttle position sensor

27 messages,  Last post on Feb 22, 2009 at 7:26 PM

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#24 of 27 Re: idle problems [dustyk] by keevine Feb 15, 2009 (6:44 am)
Replying to: dustyk (Jan 31, 2009 12:54 pm) It started idiling fine and have done nothing to it.What does this sound like to you?Fuel filter?How do you check the idle speed motor?Thank you for the help.keevine Replies to this message: dustyk (Feb 15, 2009 9:55 am) keevine (Feb 17, 2009 2:49 pm) dustyk (Feb 22, 2009 7:26 pm)
#25 of 27 Re: idle problems [keevine] by dustyk Feb 15, 2009 (9:55 am)
Replying to: keevine (Feb 15, 2009 6:44 am) If it started idling fine since the temperatures went up, it could be moisture in the fuel. Moisture can freeze, restrict the pump pickup, fuel lines, and the Fuel Pressure Regulator.   You can make a cursory check of the Idle Speed Motor by placing the Mode Control knob (Heater/Air Conditioning Control) in the defrost mode. Your should hear the Air Compressor Clutch engage and the idle speed should come up at least 50 RPM (50-125 RPM is spec.).   I would recommend checking the connections at the Idle Speed Motor and Throttle Position Sensor connectors for loose pins or signs of corrosion. Since throttle position sensors are a common failure item, you could replace it as a shotgun approach.   Check for the presence of excessive oil sludge in the fill tube under the engine oil cap. Remove the moisture diverter by grasping the end and pulling straight upwards. You will or should see the opening on the right (passenger) side of the oil fill tube for the PCV valve. If this is clogged, it could cause the engine to idle too low. In cold weather this can be especially acute. The PCV valve could also be clogged from the gooey sludge freezing overnight, then after it warms the engine may idle fine after that.   Check the various vacuum lines for splits or cracks. This can cause a loss of idle control.   The Engine Coolant Temperature or Manifold Absolute Pressure sensors could be defective.   Best regards, Dusty Replies to this message: keevine (Feb 17, 2009 2:49 pm) dustyk (Feb 22, 2009 7:26 pm)
#26 of 27 Re: idle problems [dustyk] by keevine Feb 17, 2009 (2:49 pm)
Replying to: dustyk (Feb 15, 2009 9:55 am) Thank you for responding.I will start looking for problems.After reading your response you mentioned switching the heater to the defrost mode,well thats the only place it will work.Does that tell you anything different?Its not a big deal if it doesn't as long as it defrots my window.Oh I forgot to tell you,from the time I made the last response it stoped idiling AGIAN! Thank you again for all the help keevine Replies to this message: dustyk (Feb 22, 2009 7:26 pm)
#27 of 27 Re: idle problems [keevine] by dustyk Feb 22, 2009 (7:26 pm)
Replying to: keevine (Feb 17, 2009 2:49 pm) Sorry for the late response.   When the heater control is placed into a defrost mode, a signal is sent to the PCM which causes the Idle Speed Motor to advance slightly. This is to compensate for an idle speed drop caused by the increased load of the air compressor.   If it idles fine in the defrost mode, you either have a defective Idle Speed Motor, or a PCM problem. It's possible the PCM might need a reset, although I think its more doubtful in this case.   By connecting a DRB3 scan tool to this truck, a Dodge tech. can get a better idea of what's going on.   Regards, Dusty

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