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Old January 1st, 2008, 06:08 PM   #1
Jasper_Jpr
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Default 01 Ram idle and shift problems

My 01 1500 360 auto is having fits. It has sat allot for the last year with gas prices so high. I bought a car to drive daily. I drove it over the weekend with the threat of snow on the way. The thing is acting crazy.The check engine light is on, It wants to hunt for idle, at speed if feels like it is surging or missing, and the converter lockup (I think, a 300RPM tach jump) keeps shifting in and out. This is the first electronic controlled gasser I've had. The local dealer is no help all they will suggest is to bring it in and let them hook it to the scope for (1-2 hrs labor) diagnostic time witch is very pricey. I took it to Autozone and had the codes read and the only code showing is evaporative system error. Can,t find any vacuum leaks, also checked the gas cap. Anyone got any Ideas
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Old January 1st, 2008, 07:08 PM   #2
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I would start with checking your TPS since it sends signals to the computer for both the engine and the trans.
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Old January 1st, 2008, 07:17 PM   #3
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if you didn't live so far away i'd offer to take a look at it for you.
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Old January 2nd, 2008, 01:12 PM   #4
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KillerB is correct, you also need to have someone with a decent scan tool to diagnose this issue. I have had similar complaints with this issue and found it to be a bad PCM ground also. There is an atsg tech bulletin for this issue.... here is some of it: The above complaints are all caused by a bad internal computer ground, this ground is shared by many components depending on model and engine application. This ground is located at the A4 terminal in the GRAY connector at the PCM. On a GASOLINE application the Governor Pressure Sensor, Battery Temp. Sensor and Oxygen Sensors share this ground as well as other engine management sensors as shown in the wire diagram in Figure 2. The Battery Temp. Sensor is used to convey battery temperature to the PCM while the PCM monitors charging system voltage, in order to control battery charging rate. The result of this data is, charging system voltage will be higher at colder temperatures, and is gradually reduced as battery temperature rises. The Battery Temp. Sensor is located under the battery in the battery tray. On diesel equipped vehicles with dual batteries, it is located in the driver’s side battery tray. This location is enough to cause problems due to corrosion. The sensor wire harness travels underneath the battery tray, (See Figure 4), to a 2 terminal connector, (See Figure 5), where the sensor resistance can be checked. Resistance values are, 9,000 (9k) to 11,000 (11k) ohms at 75ºF to 80ºF (25ºC). Battery Temp. Sensor temperature range is -40ºF to 389ºF (-40ºC to 199ºC). Battery Temp. Sensor voltage range is 0 to 5.1. The poorer the ground is, the lower the voltage indicated will be, resulting in a high temperature reading. This sensor works opposite of a normal thermister. Repair the ground or replace the sensor causing the poor ground.
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Old January 9th, 2008, 07:51 PM   #5
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My 97 did that, it was the shift solenoid in the transmission, had it changed and was good to go.
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Old January 18th, 2008, 03:25 PM   #6
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Finally got a chance to work on the Ram a little last night. It appears there is some trouble with the TPS possible a bad connection. Didn't get real deep into it darkness was catching me. If you handle the plug or wires the idle goes crazy. I am hoping this is it. If I can stand the cold this weekend (won't fit in the garage) I hope to check it out further. Thanks for the help guys.
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