Question about 1992 Cadillac DeVille

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How to adjust Idle Speed Control Motor 95 deville

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6ya6ya
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Posted on Jan 02, 2017

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bibleman01
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SOURCE: My 95 Deville Shakes When my speed becomes greater than 40mph.

Its tire balance or an out of round tire. Also chk tie rod ends.
God Bless Greg

Posted on Dec 02, 2008

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airjer995
  • 5332 Answers

SOURCE: I Have a 95 deville , replaced thermostat and have

Either you are low on coolant or you still have an air pocket in the system after you replaced the thermostat.

With the engine cold remove the radiator cap. Top off the radiator if low. Start the engine and allow to warm up at idle, topping of the coolant as necessary. Once the thermostat has opened, the upper hose will get hot. Snap the throttle a couple of time. This will help force coolant into the heater core and push out the air. Once the cooling fans come on replace the radiator cap.

Raise the engine RPM'S to about 2,500 and hold it until there is sufficient heat out of the vents. Let the engine idle, Id there constant heat? If not snap the throttle a couple more times and then raise the RPM's up again.

Posted on Dec 14, 2010

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1 Answer

Hi, my rpm stays on high after cleaning the idle control valve


An IAC (idle air control) motor is designed to adjust the engine idle RPM speed by opening and closing an air bypass passage inside the throttle body. The cars computer or ECM (electronic control module) receives information from various sensors and will output signals to adjust the IAC motor in or out to adjust engine idle speed by controlling engine idle air. ----------------------------------------------------------------------------------------
XPROG-M V5.0

Feb 26, 2013 | Cars & Trucks

1 Answer

Where is the idle control valve on the 1999 Cadillac De Ville and is it the same thing as the idler motor?


The IAC or idle air control valve is mounted in the throttle body and uses an air passage that opens or closes to increase idle speed where as an idle motor usually pushes against the throttle plate to increase idle speed most idle motors (stepper motors) where phased out and was never used on port fuel injected engines chances are you have an IAC valve

Dec 11, 2012 | 1999 Cadillac DeVille

1 Answer

94 nissan altima won't start and iddle after cleaning IACV valve


An IAC (idle air control) motor is designed to adjust the engine idle RPM speed by opening and closing an air bypass passage inside the throttle body. The cars computer or PCM (powertrain control module) receives information from various sensors and will output signals to adjust the idle air control motor in or out to adjust engine idle speed by controlling engine idle air. An idle air control motor can fail one of two ways, either the motor short circuits and stops working or the motor will develop high resistance and cause the idle air control motor to react slowly, either failure can cause the engine to stall at idle. When a trouble code scan is performed it sometimes won't always detect a failed or weak idle air control motor.

Oct 08, 2012 | Nissan Altima Cars & Trucks

1 Answer

Where is the idle screw located. Is it on the idle cylenoid. Probably spelled that wrong.


on the 4.9 liter v8 the idle speed control motor is is located in front of the throttle body it has two miniature pulley's on the side of it where the throttle cables are, there is a screw located on the idle speed control motor which can be adjusted but i would not sugggest it they are known to go out and they do affect the idle when they are malfunctioning its fairly simple to change and the its called the idle speed motor made by duralast they are seventy two dollars at auto zone the pic. of part i explained1_19_2012_4_12_07_pm.jpg

Jan 15, 2012 | 1992 Cadillac DeVille

1 Answer

I have a 1996 Eclips 2litre when you get in and start it with your foot on fuel it works fine when you take your foot off it dies out.Also its only getting 5amp/volts witch ever it is to the fuel ,map...


I am not saying 100% this is your problem because this is a fairly expensive part however your symptoms are classic IAC failure. An IAC (idle air control) motor is designed to adjust the engine idle RPM speed by opening and closing an air bypass passage inside the throttle body. The cars computer or PCM (powertrain control module) receives information from various sensors and will output signals to adjust the idle air control motor in or out to adjust engine idle speed by controlling engine idle air. An idle air control motor can fail one of two ways, either the motor short circuits and stops working or the motor will develop high resistance and cause the idle air control motor to react slowly, either failure can cause the engine to stall at idle. When a trouble code scan is performed it sometimes won't always detect a failed or weak idle air control motor. To check the idle air control motor remove the unit, with the wires connected turn the key to the "on" position without starting the engine, the idle air control should move in or out. If the idle air control motor does nothing it has probably failed, replace it with a new unit and recheck system. Note: while the idle air control motor is removed clean (use aerosol carburetor cleaner) the passages the idle air control uses to control idle air speed, also inspect the idle air control for a build-up on the seating (pointed) end and clean as necessary.

Jul 20, 2011 | Mitsubishi Eclipse Cars & Trucks

1 Answer

Just started idling rough, sometimes stalling


Shot in the dark here without knowing the vehicle but it could be an Idle Air Control valve starting to fail. An IAC (idle air control) motor is designed to adjust the engine idle RPM speed by opening and closing an air bypass passage inside the throttle body. The cars computer or PCM (powertrain control module) receives information from various sensors and will output signals to adjust the idle air control motor in or out to adjust engine idle speed by controlling engine idle air. An idle air control motor can fail one of two ways, either the motor short circuits and stops working or the motor will develop high resistance and cause the idle air control motor to react slowly, either failure can cause the engine to stall at idle. When a trouble code scan is performed it sometimes won't always detect a failed or weak idle air control motor. To check the idle air control motor remove the unit, with the wires connected turn the key to the "on" position without starting the engine, the idle air control should move in or out. If the idle air control motor does nothing it has probably failed, replace it with a new unit and recheck system. Note: while the idle air control motor is removed clean (use aerosol carburetor cleaner) the passages the idle air control uses to control idle air speed, also inspect the idle air control for a build-up on the seating (pointed) end and clean as necessary.

Jul 20, 2011 | Mazda B2300 Cars & Trucks

1 Answer

1989 Cadillac Sedan De Ville engine stalls when air is turned on...tries to take off when stopped at stoplight..sometimes dies while driving..


It sounds like the idle compensation circuit for the engine is dirty or faulty. Have your car checked at a shop. have them check the idle air motor for dirt or malfunction. It could be that it only needs to be cleaned or replaced.

The compensation circuit adjusts the idle/slow speed of the engine. The air conditioner puts a load on the engine and this circuit adjusts the engine speed to compensate. Also, when the car is cold this circuit adjusts the idle speed to prevent stalling and help the engine warm up faster. I hope this information helps you.

Aug 16, 2010 | 1989 Cadillac Sedan DeVille

3 Answers

Idle at 250 rpm


Idle Speed Control (ISC) Motor OPERATION Eagle Throttle Body Fuel Injection (TBI) System NOTE: The Eagle TBI system is used only on 2.5L Premier engines. The Idle Speed Control (ISC) motor is mounted to the throttle body and controlled by the PCM. The throttle lever rests against the initial adjustment screw of the actuator (plunger). The idle speed is not adjustable. The initial adjustment screw is only used to establish the initial positioning of the actuator when the ISC motor has been replaced. The actuator extends or retracts to control engine idle speed and to set throttle stop angle during deceleration. Based on inputs from the various engine control system sensors and switches to the PCM supplies current to the ISC motor to adjust the actuator position for the particular operating conditions.
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Aug 05, 2010 | 1995 Dodge Spirit

1 Answer

Idle control system


A quick trip to the dealer would confirm but it sounds like your I.A.C. (idle air control motor) may be broken. I don't remember it being too expensive when I replaced it on my 95 caddy de ville. Also check out these symptoms-
Is your car idling properly?
Does it get rough under load or other conditions?
Any idle or off idle irregularities at all?
If so these symptoms may be linked to the I.A.C.
-Dynami

Mar 31, 2009 | 1997 Cadillac DeVille

1 Answer

2001 caddilac Deville intermittant stalling. rpm drops below 600 and stops usually at traffic light. no roughness prior.


sounds like an IAC motor. that stands for idle air control motor. it adjusts throttle to keep at steady speed. could possibly be throttle positioning sensor though. pay attention to see if it does it worse while mashing breaks because if EGR is stopped up it can cause symptoms similar too.

Dec 10, 2008 | 2001 Cadillac DeVille

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