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Have the electronic engine control system run through an active test to see if the computer senses any issues with the engine running mode. This test needs to be done with a high end scanner that can run what we call a "Key On Engine Running" (KOER) self test.
A vacuum leak Leaking air intake after the throttle body EGR valve leaking vacuum A faulty positive crankcase ventilation (PCV) valve Damaged/failed/dirty throttle body Failed EVAP system Failed IAC (idle air controller) or faulty IAC circuit
check for ghost codes, the light does not need to be on to have codes stored. I would also check your vacuum lines as these can have strange impacts on a idle. check you pcv valve to make sure it is working proper
Check the wiring to the throttle body, check the supply voltages as well. Check fuses too, it sounds like it received a voltage spike and then lost voltage and is now forcing limited rpm.
The most common problem with these would be the transfer case actuator motor or also called the selector, this is what controls the 4wd at trnsfer case, the only other thing would be the button controls they go bad also, you should have the compuetr scanned for any stored codes, the codes will tell you where the problem would be, for example if the computer sees a problem it will turn on a 4wd light or check engine light and sometimes wont turn the light on depending, anyway it stores a code with the problem, example a scan tool is connect to truck connector and computer is scanned for codes and lets say theres a code like p1269 selector motor high voltage, now that code would mean theres a problem in that system,
P2104 Throttle Actuator Control System - Forced Idle
P2107 Throttle Actuator Control Module Processor
P2110 Throttle Actuator Control System - Forced Limited RPM
P2111 Throttle Actuator Control System - Stuck Open P2112 Throttle Actuator Control System - Stuck Closed
Idle air control is not a sensor on the air horn.Why do people who have no clue bother answering? The idle speed is controled by the throttle body which allows a specific amount of air to flow into the engine thus controlling your idle speed. In this application it is an integral aspect of your throttle body. Check your throttle body for contamination. Check your wire harness connecters.
There are to many things that can cause your blazer from idling.
Go to Auto Zone or Parts Source and they can scan your blazers computer. There should be a DTC code which should make you understand why your having the problem.
I believe they both scan for free and may have the parts you need to replace and give you the how to do it your self instruction for the repair:
Good luck and hope this helps, here are some codes that control ther idle speed of your engine. It's the air idle control valve that may have gone bad or it just may be a dirty or stuck EGR valve. The scan should let you know.
P1505 Idle Air Control At Adaptive Clip P1506 Idle Air Control System Over speed Error
What speed does the car idle at in rpm?
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