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WHEN INSTALLING A IDLE AIR CONTROL IAC ON A 2000 CADILLAC 4.6 IS IT NESESSARY TO RESET THE COMPUTER, IF SO WITHOUT A SCANNER....WHAT IS THE BEST WAY TO RESET IT?

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You can do an "Idle Relearn" by disconnecting the NEGATIVE battery cable for 5 min's

Posted on Dec 16, 2016

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WOULD A IDLE CONTROL VALVE/IDLE AIR CONTROL BE CAUSING MY 2000 CADILLAC DEVILLE TO IDLE AT 1400 TO 1750 RPM SOMETIMES IT IDLES OK..IS IT A HARD FIX..THANKS...


Try cleaning the throttle plate first . I wouldn't just change the IAC valve without testing , hooking up a scan tool that show engine data.
A few different thing's could cause high idle .The idea is to test all thing's that could cause a high idle till you find the problem. Vacuum leaks , throttle plate sticking because it's gummed up with carbon , varnish build up . Or is the PCM/ECM making it idle that hight etc... Is the throttle cable bound up.

Dec 07, 2016 | 2000 Cadillac DeVille

1 Answer

HOW DO I INSTALL A TPS ON MY 2000 CADILLAC DEVILLE 4.6 ENGINE?


Throttle Position Sensor Replacement
Remove the idle air control (IAC) electrical connector (1) from the IAC sensor (4).
Remove the manifold absolute pressure (MAP) sensor electrical connector from the MAP sensor.
Remove the water pump belt cover.
Remove the TP sensor retaining screws electrical connector (2) from the TP sensor (3).
Remove the TP sensor electrical connector (2) from the TP sensor (3).
May have video on youtube showing how to

Dec 06, 2016 | 2000 Cadillac DeVille

1 Answer

Where's the idle screw on a 2002 Cadillac Deville


No screw - fully computer controlled. Also, there is no idle control sensor - just a throttle position sensor (TPS) and an idle air control (IAC) motor. If you are replacing the IAC, clean the throttle body ports VERY carefully using a recommended solvent.

Sep 16, 2014 | 2002 Cadillac Deville

2 Answers

Idle air control


Clean throttle body,could be IAC sensor.

May 21, 2013 | 2000 Mitsubishi Mirage

1 Answer

I changed my IAC valve on my 2004 ford taurus dohc, and now the rpms sit between 2000 and 2500. I checked it with a scanner and it gave me the code p0511....How can i fix this?


CODE PO511 - IDLE AIR CONTROL VALVE CIRCUIT MALFUNCTION. TAKE VECHICLE TO FORD DEALERSHIP LET THEM RELEARN THE IDLE AIR CONTROL VALVE TO THE PCM. ITS GOING TO COST $35.00 TO RESET.BUT CAR NOT GOING TO IDLE CORRECT UNTIL NEW PART REPROGRAM TO THE PCM

Jul 27, 2011 | Ford Taurus Cars & Trucks

1 Answer

Can i leave my iac sensor unplugged on my 2001 cadillac deville it runs fine without it


IAC yes you can your IAC is idle air control why dont you use a throttle body cleaner see if that solves your concern

Jun 08, 2011 | Cadillac DeVille Cars & Trucks

1 Answer

Idles high what can i do.


Get the IAC valve checked.Remove the Iac valve from the throttle body. It is on the side facing the front higher than the tps sensor. It has a 4 wire connector. Make sure this is clean. If it is dirty/dusty then clean it. This valve controls the idle speed. After cleaning it turn the ignition on with the engine off. The Iac should move in and out to find the stops. If it does not move you have either bad wiring, Iac or pcm. Most likely is Iac.
-------- For safety measures,before removing the IAC make sure you don't have any vacuum hoses unplugged. Next make sure the throttle blade closes all the way.Iac is short for idle air control valve. ------- Thanks.Helpmech.

Nov 13, 2010 | 2000 Cadillac DeVille

1 Answer

Car speeds up without any assistance..what causes this dangerous situation??


do this happen at any speed or just at idle?

most of the time it is because the IAC (Idle Air Control Motor) is faulty and allowing too much air passed the closed throttle

if this is occurring at any speed, even when part throttle then it could be cruise control related, but should rectify when depressing brakes

Therefore we go back to the IAC

Apr 11, 2010 | 1997 Cadillac DeVille

1 Answer

Changed computer, fuel regulator dual tank switch, wires cap rotor 302 injected will start and run then after a few minutes will idle fine till put in gear and quit,am lost and tired of guessing


Check the IAC .....the idle air control......and remember these computers need to relearn the idle speed.....after a repair....if it's an automatic....put it against something solid in gear and let it sit there for a few mins without holding the brake after giving the IAC a good cleaning or possibily installing a replacement IAC.

Aug 17, 2009 | 1985 Ford F 250

1 Answer

Idle is too low, car dies, engine runs fine


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 car 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.
An IAC motor is highly susceptible to carbon and coking build up; if an IAC goes too long without cleaning it can cause stalling and poor idle quality. Some cars are designed with a large vacuum transfer hose that connects the intake manifold to the IAC (idle air control) motor. If a broken or dilapidated these vacuum lines can cause the engine to lose vacuum which will allow the engine to run rough and die. 
Inspect all engine and accessory vacuum lines to look for missing, torn or dilapidated lines and replace as needed. To check the IAC motor remove the unit, with the wires connected turn the key to the "on" position without starting the engine, the IAC should move in or out. 
If the IAC motor does nothing it has probably failed, replace it with a new unit and recheck system. Note: while the IAC motor is removed clean (use aerosol carburetor cleaner) the passages the IAC uses to control idle air speed.

Good luck and hope this helps

May 08, 2009 | Honda CR-V Cars & Trucks

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