Question about Cadillac DeVille
When u say pulsates does this mean the idle speed fluctuates up and down, we call this "surge" and it is almost always caused by a sludged up throttle valve and automatic idle speed control air bypass valve valve, please do the procedure below exactly as laid out and it should cure the problem, this assumes u have no engine control fault codes stored in the computers memory.
To correct this problem I want you to get a can of intake cleaner (ABOUT $5.00) from any local auto parts store like NAPA or Carquest, do not use carburetor spray, intake cleaner only or u will damage the Teflon coating inside the throttle valve and air bypass valve, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.
Posted on Jun 01, 2010
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Posted on Jan 02, 2017
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This could be the idle air speed motor. The reason that you dont get a MIL is because the oxygen sensors are not hot enough to be read by the ecm.
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