Question about 2003 Oldsmobile Aurora

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2003 Aurora V8 4.0

I have the exact same problem as you described with my 2003 Aurora 4.0. It will cut off at a light or in the middle of driving down the highway. I took it to the dealership but no codes were found. It happens intermittantly. Did you ever find out how to correct the problem? If so, what was it?

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Ok, this is what I did a few months ago and my '03 Olds hasn't stalled since. Buy GM cleaner P/N 1052626 or GM X 66A or equivalent. Locate the Idle Air Control Valve (IAC). On the front of the throttle body you'll see a shot-glass-sized metal cylinder with a black 3 wire connector. This metal cylinder is just to the right of a rubber air line with a 90 degree elbow on it, this is the IAC. Removal: 1. With the car in park and the ignition OFF. Remove the electrical connector from the IAC. 2. Remove the 2 IAC attaching screws. 3. Remove the IAC from the throttle body. 4. Remove the IAC O-ring. NOTE: If the IAC has been in service: DO NOT push or pull on the IAC pintle. The force required to move the pintle may damage the threads on the worm drive. Also, DO NOT soak the IAC in any liquid cleaner or solvent, this may damage it. Cleaning: 1. Using the cleaner, clean the IAC valve O-ring sealing surface, the pintle valve seat, and the air passage. I used the cleaner, shop towel, and a tooth brush. * If the air passage has heavy deposits, remove the throttle body for complete cleaning. * Shiny spots on the pintle seat are normal and do not indicate misalignment or a bent pintle shaft. 2. Inspect the IAC valve O-ring for cuts, cracks, or distortion and replace if damaged. NOTE: The IAC may be damaged if installed with the cone (pintle) extended more than 28mm (1 1/8in). Measure the distance that the valve is extended before installing a new valve. The distance from the IAC motor housing to the end of the pintle should be less than 28mm. Manually compress the pintle until the extension is less than 28mm. Install: 1. Install the IAC into the throttle body. 2. Install the 2 IAC attaching screws and torque to 27 lbs. 3. Install the electrical connector into the IAC. 4. The powertrain control module (PCM) will reset the IAC whenever the ignition is turned ON. 5. Turn the ignition ON. 6. Turn the ignition OFF. 6. Perform the IAC learn procedure. IAC Learn Procedure: 1. Start and idle the engine for 15 seconds. 2. Turn the ignition switch to the LOCK/OFF position. 3. Wait 15 seconds. 4. Restart the engine and check for proper idle operation. Hope this works for you too.

Posted on Mar 28, 2009

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