Question about 2003 Cadillac Seville SLS

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WHY DOESNT MY 2003 CADILLAC SEVILLE HAVE ANY POWER AND DOESNT WANT TO SHIFT EASILY

STARTED BY NOT WANTING TO KICK DOWN INTO PASSING GEAR NOW NO POWER AND DOESNT WANT TO SHIFT UNLESS YOU BACK OFF THE GAS PEDAL

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Are there any lights lit on the instrument cluster , check engine ? any messages on the DIC - driver information center , ENGINE POWER REDUCED,SERVICE VEHICLE SOON - 3
The IPC illuminates the SERVICE VEHICLE SOON -- 3 message in the DIC when the PCM detects certain malfunctions that are unrelated to the emission system. The IPC receives a class 2 message requesting illumination from the PCM .
SERVICE TRANSMISSION - 100 ?

Posted on Apr 05, 2015

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1. Verify the exhaust system is not plugged. Check for less than 1.5 PSI backpressure at 2,000 RPM in park, or open the exhaust before the converter.

2. Check the Manifold Absolute Pressure Sensor (MAP) for 4.8-5.0 volts Key On Engine Off (KOEO) and about 1 volts at idle.

3. Check actual engine vacuum at idle at 2000 RPM.

4. Unplug the Mass Air Flow (MAF) sensor, reset fuel trim to 0%, and road test. ALSO CHECK FOR FAULT CODES IN THE OBD SYSTEM.

Posted on Apr 05, 2015

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Posted on Jan 02, 2017

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