super white alero1 |
10-06-2008 06:45 PM |
I lmao @ this thread, everyone was giving advice to what the cause could be. An engine surge is generally caused by unmetered air into the engine. Other causes could be a partial clog in one of the injector, IACV could attribute to this due to excessive carbon buildup in the intake from a bad or leaky PCV valve. The TPS does not control any, it’s a sensor that sends a resistance signal to the PCM to identify the position of throttle plate.
A little FYI Bulletin Number: 03-06-04-030F published by GM covers a similar case (partially clogged injector). Also Bulletin Number 02-06-04-009 address a cold start stumble causes by low coolant temperature. Did you know low coolant in the engine can also cause surging? If the temperature between the engine and air is in excess of over 200* the computer will rich out the mixture to prevent a knock (ie Toyotas and Honda -Fail-safe to prevent leaning the engine) and trip MIL. A faulty oxygen sensor can also trigger a surge (ie. Ford Mustang GT) because it determine the amount of oxygen to Hydrocarbon in the exhaust , sends the signals to the Pcm so the PCM sends the signal for duration of the injector opening.
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The reason being is because the computer wasnt properly telling the TPS to open at the proper amount. instead it was telling the TPS to idle at 3% which it should be at 1% open. so a reflash (reprogram) of the PCM fixed the problem. There....you just learned something.
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The PCM does nothing with the TPS, its the other way around, the TPS sends signal to the PCM. The TPS is used for several function, to determine load on engine and gearing transmission downshifts.
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Ya so update! Car's PCM was reflashed a second time and this time at the GM dealer only for $80 and problem with idle totally fixed. driving it for 3 weeks and no problems! so stuff your "LOL"s Turns out the PCM problem can cause the idle problem.
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Sound like they did this bulletin for you.
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02-06-04-009 Some owners may comment on a hesitation or stumble on throttle applications after a cold start at temperatures below approximately 50°F (10°C). This condition will not occur after the vehicle has warmed up and has been operating in closed loop. No PCM diagnostic trouble codes will be stored and no MIL will illuminate.
Cause
In some instances, the PCM fueling strategy may not be optimized during throttle application conditions at low coolant temperatures.
Correction
Reprogram the vehicle PCM with new calibration software.
Calibration Information
The Calibrations are electronic calibrations and are not available from GMSPO. For 1999, 2000, and 2001 model year vehicles, calibrations are currently available from Techline using the Service Programming System (SPS). After entering the VIN for the vehicle to be reprogrammed, use the calibration identified as "New Calibration to Address Cold Hesitation Problem" on 1999 and 2000 vehicles. On 2001 models, the calibration to correct the cold hesitation is included in the "New Cal to Correct False Setting of DTC P0441".
Important : Model Year 2000 vehicles with this concern may also be subject to USA and IPC Customer Satisfaction Campaign # 01028B - Generator Low Voltage Indicator Light PCM Reflash or Canada CMVSS Non-Compliance Campaign # 01029B - Generator Low Voltage Indicator Light PCM Reflash. The calibrations released for the hesitation concern also incorporate the calibrations for Campaigns # 010288 and # 010298. Because these 2000 model year vehicles with 2.4L LD9 engines may need to be reflashed twice, it is important to manage the situation in such a way as to maximize customer satisfaction while minimizing customer inconvenience.
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So they charged you $80.00 for their time. They must be really cheap because every single dealership around here charges $110.00 + per hour. A diagnostic takes 0.8 hours, performance test 1.6 hour a reprogramming takes 0.6 hours, a retest take 0.2 hours totaling about 3.2 hours, this not including supplies needed to keep your car clean. You truly think they only billed you $80.00 for all that?
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Originally Posted by jordan
(Post 394604)
who cares what you have to say, i have a life and im done answering your crap. you can keep responding if u want but seriously man get a life.
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I only comment to help not to piss on you, but it seems you want to be pissed on.
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