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The first thing I would do, is clean your throttleplate and
throttlebody. The throttleplate builds up dirt as does the surrounding
housing and it chokes off the air supply needed for maintaining idle. On
3800 engines, there is a screen that blocks access to the plate, so
you'll need to remove the throttlebody and clean it from the backside.
It's relatively easy and straightforward to do. Remove the mass air flow
sensor from the top of the throttle body and clean the element with
alcohol and a q-tip. Then spray the throttle plate and housing with carb
or throttlebody cleaner and scrub with a brass brush. Open the plate by
hand and scrub the housing. Wipe it clean and reassemble. See if that
helps and let me know either way, whether its now good, or whether it
still stalls and we'll work together if need be to rectify Idle Air Control motorthe IAC motor can close during cruise, and get stuck in the dirt that
builds up in the housing. When you come to a stop the pintle may get
stuck in the dirt, causing the stall. Then it frees up if it still has problems after this try changeingthe coils and module
Most likely caused by a dirty throttlebody! Remove the intake hose to the throttlebody and clean around the inside and the butterfly valve as well with some brake clean or similar product! Throttlebodies get gummed up by carbon build up effectively closing off the idle airgap under the butterfly valve!
sounds like the idle air control sensor is bad or it could be the idle speed control sensor(module) both can be found on the throttlebody. but to be sure you can take the car to auto-zone and they will run a free diagnostic even if you dont have a check engine light there still may be a code stored.
This P0507 code is one that's sometimes triggered on vehicles that have electronic throttle control. That is, they don't have a regular throttle cable from the accelerator pedal to the engine. They rely on sensors and electronics to control the throttle. In this case, the P0507 DTC (diagnostic trouble code) is triggered when the PCM (powertrain control module) detects an engine idle speed that is greater than the desired (pre-programmed) RPM. In the case of GM vehicles (and possibly others) if the idle speed is over 200 rpm higher than expected, this code will be set.
I just worked on this problem a couple of days ago. If the motor is a 3.0 liter. The idle control valve is located at the bottom of the throttlebody assembly right below the bore for the throttle butterflies..What usually causes this valve to go bad is the mechanical part of the sensor sticks as it becomes sludged or carboned up. Manufacturer claims that the valve cannot be cleaned and should only be replaced....It's a high dollar repair to replace this sensor as your engine coolant flows through this electrical valve. The valve idles the car fast when cold, as the antifreeze gets hot the valve drops the idle down.....I have successfully cleaned several of these valves and cured the dying problems...
First remove the air filter top cover and the tubes that connect to the throttlebody. In the right throttlebody you will see a port right before the butterfly. Under the throttlebody you have a black plastic sensor with a 2 wire terminal. Remove the 2 phillps screws and pull off the electrical part of the valve. you will feel a magnetic pull while removing. Remove slowly and catch the black sealing oring, and there will be a metal washer also.. The shaft that is exposed is the mechanical control of the valve. Rotate the shaft and it should feel sticky if bad..Using a throttlebody spray cleaner spray into the small square port of the right bore, rotate shaft and spray until stickfree.....Reassemble