Question about Cadillac Eldorado
Trying to de-cypher the language here now if i have read it correct then you are refering to the stepper motor as its obvious a injection vehicle which didnt appear in europe till 92 when cats were brought in ,anyway the motor is controlled by the computer which adjusts the power to the stepper motor to increase or decrease the amount the plunger (screw) opens to allow more air to increase idle ,their are four wires on the motor of which their are 2 returns and 2 feeds which screw the plunger in or out ,So use a automotive meter to measure the power when its applied to the motor or two little lights one on each feed ,Now the fault often happens where the ECU doesnt compute the idle so no voltage indicates a ECU fault ,now if you do get power and its not adjusting right then it could be a fault with the RPM gauge where the ECU picks up the information so what i do in this case is with a warm engine i set the motor to the optimum position with the plug disconnected for a idle of around 850RPM in drive with handbrake on of course and leave the plug off .OK its a bit slow when cold as the auto choke cannot increase idle but at least it works ,also check the engine breather system as a perished pipe on the breather will cause the idle to be out but if this is the case then it races but not in all cases depending on make of vehicle ,The plunger should be self adjusting by the way as its adjusted by the computer so it doesnt need pre setting
Posted on Mar 18, 2011
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Posted on Jan 02, 2017
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