Question about 1994 Cadillac DeVille
It is supposed to have a high idle when first started this is normal automatic idle speed control strategy
Posted on Oct 26, 2012
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Posted on Jan 02, 2017
sounds like the ISC ( idle speed control ) motor is being told by the computer to extend or else its possibly binding. Located on the drivers side of the throttle body . Also check for binding aceelerator linkage. One other thing that might sound strange is check the floor mat by the gas pedal. Sometimes gets jammed.
Posted on Mar 29, 2009
your water pump may need to be changed. have a trusted mechanic check it. the water pump is connected to the drivebelt of your 4.9 l engine, and if thats where the sound is coming from you can be pretty certain
Posted on Aug 10, 2009
you need to figure out if your missing spark at the plgs,or check fuel pressure at fuel rail,you'll need at least 55psi of fuel pressure,but if you have had no luck spraying the throttle body,your probably missing spark
Posted on Jan 07, 2010
SOURCE: My 1993 cadillac deville feels
The error is indicating that the Throttle Position Sensor (TPS) is out of the normal range with respect to the Idle Speed Control (ISC). Try something really simple and inexpensive first by removing the air ducting between the air filter box and the throttle body. Clean the throttle body interior and throttle plate with a cloth sprayed with WD40. Turn the throttle plate by pushing it at the top with your fingers and clean the throttle throat behind the plate as best you can. Reassemble the ducting and ensure that there are no air leaks at the junctions and no splits. Turn the key to position 2 (engine not running) and depress the accelerator pedal to the floor and then back up again. Start the car and nine times out of ten that should fix it. The TPS measures the opening angle of the throttle plate. The TPS is device consisting of a circular carbon track with a slider, corresponding to the throttle plate, sweeping along it. It as three wires to it, two to provide the 0 to 5 volt range along the length of the carbon track and the third to measure the voltage at the contact point of the slider. To check the TPS measure the voltage of the middle pin of the connector when the ignition is at position 2 (engine off) as you push the throttle plate open and closed by pressing on the accelerator pedal. The voltage should alter in a smooth continuous way. Any drop outs of signal indicate a worn carbon track and the TPS should be replaced.
Posted on May 09, 2011
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