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Pickups Dodge Dakota Dodge Dakota throttle position sensor
27 messages, Last post on Feb 22, 2009 at 7:26 PM
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Replying to: dustyk (Jan 17, 2009 6:09 am)
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my truck dies when slowing and sputters sometimes but fires back up im out of answers
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Replying to: keevine (Jan 17, 2009 6:58 am) Regards, Dusty
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Replying to: roadhazard (Jan 30, 2009 9:12 pm) How many miles on the vehicle? When was the last tune-up performed (miles)? Regards, Dusty |
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Replying to: dustyk (Jan 31, 2009 12:54 pm)
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Replying to: keevine (Feb 15, 2009 6:44 am) 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
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Replying to: dustyk (Feb 15, 2009 9:55 am)
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Replying to: keevine (Feb 17, 2009 2:49 pm) 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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