Engine light came on and read code says p0506 which is Idle Air Control System RPM Lower Than Expected and says Clean Throttle Body and Set Idle Adaptation
This problem
is commonly caused by a dirty automatic idle speed control valve and
throttle valve. Buy a can of throttle valve cleaner (do not use
carburetor spray cleaner!) from NAPA or Carquest (made by CRC
chemicals) and spray it into the air intake while the engine is
running, use up about 1/2 the can, engine will try to stall hold the
speed up, shut it down and let it soak for 30 minutes, restart and
blow out the remaining fluid, shut it down and disconnect the
negative battery cable for 5 Min's to reset the base idle control
SOURCE: how can i clean the throttle body my self?
You can either clean it on the truck or off, better off of the truck, that way you can get both sides. Take off the black tube coming from the air filter housing, if your going to take the whole thing off the truck, you will need to disconnect the throttle cable from the housing. There should be 4 bolts holding the body onto the intake. Get a can of fuel injection air intake cleaner, spray it in the body and on the plate, wipe dry with a clean cloth. Repeat until clean. When you start the truck back up, it might sound like it's miss firing, don't worry, it will clear up.
SOURCE: 2000 gmc rough idle
Im not sure if this can help, but my 2000 gmc sierra was idling badly. Replaced Fuel Pressure Regulator and my truck runs like its brand new. My service engine light was also on.
SOURCE: my 1993 GMC Suburban 5.7 liter with throttle body
Wow, That has gotta be a pain. The Maf sensor regulates the fuel supply needed for proper air fuel ratio by telling ecu how muc air is moving thriugh the intake. Check it first, Then the TPS. Good Luck.
SOURCE: 92 gmc 350 pickup....rough idle..have replaced MAP
This could be a couple of things:
Worse scenario is the head gasket make be leaking water into a cylinder. Get a cylinder leakage test done to verify any manifold air leaks or faulty sealing head gaskets.
Good luck, let me know how you get on.
SOURCE: right off idle truck stumbles and will die if you
its time to stop wasting money guessing and verify if parts are good/ bad. ck fuel pressure, and check the tps (Throttle Position Sensor) , see if it runs better with the EGR valve disconnected. If it does, replace it Use only AC DELCO parts they will need number off old EGR valve usually starts with 17------. NOT from ottozone or others.
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idle air control system RPM higher than normal
idle air control system rpm higher than normal
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