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idle air control [iac] system rpm higher than expected--causes a vacuum leak --leaking air intake after throttle body ---egr valve vacuum leak--damaged/failed/dirty throttle body---a faulty positive crankcase ventilation valve [pcv]----faulty/damaged evap system---failed/faulty [iac] idle air controller //circuit
Make sure the idle screw was not turnned causeing tps sensor to read over the spec limit, the next then is to make sure the idle air control valve is working , a bad valve will cause this problem and last is the stepper motor that controls the idle. some of these around this year used steeper idle control motors instead of idle air control valves and in turn the stepper motor is bad it will hold the throtle plate open to much causing the tps reading to be wrong triggering the engine light to come on. the steeper motor will be boltted to side of the throtlebody and theres a small arm to the throtle linkage. i will enclose a stepper motor picture and an idle air valve to show you, but this sounds like the tps is out of range due to this. the last thing is to make sure there are no vacuum leaks, spray crab cleaner around throtlebody base gasket and also the intake mounting gasket and see if the idle changes is so theres a vac leak in that area. good day. okay just did a little research and this truck does have a idle air control valve, the picture is encolsed and is screwed into throtlebody, check that and for vacuum leaks, make sure tps is good sometime it will test good when testing and go bad when it wants, you could have a bad tps and idle air control valve also.
High idle is usually caused by a vacume leak. First place to check is the cold air intake manifold. All hoses, throttle body, and sensors. Throttle Position(TPS), Mass Airflow(MAS), Idle Air Control Motor (valve) IAC. Controls Idle speed
A malfunctioning throttle system can cause both a high idle as well as an engine stall.
sorry but their are no diadnostic codes with this number in the manufacturers codes i have
P0505....Idle Control System
P0507....Idle Control System RPM Higher Than Expected
but i have found these generic codes for you if they help
Idle Air Control System RPM Higher than expected. The computer is detecting an idle speed higher than what it should be. A vacuum leak perhaps...EGR valve, faulty PCV valve, throttle body, EVAP system, idle air controller or circuit. Check for vacuum leaks.
Here is the first half of the codes look till you find the one you have 111 System PASS. 112 ACT sensor circuit grounded. 113 ACT sensor circuit open. 114 ACT sensor is out of Self-Test. 116 ECT sensor is out of Self-Test. 117 ECT sensor circuit grounded. 118 ECT sensor circuit open. 121 TP sensor is out of Self-Test. 122 TP sensor input is less than Self-Test minimum. 123 TP sensor input is greater than Self-Test maximum. 124 TP sensor input voltage is greater than expected. 125 TP sensor input voltage is less than expected. 128 MAP vacuum hose damaged or disconnected. 129 Insufficient MAF input. 136 HEGO sensor circuit indicates system lean (Right HEGO). 137 HEGO sensor circuit indicates system rich (Right HEGO). 139 No HEGO switching (Front Side). 141 Fuel system indicates lean. 144 No HEGO switching (Left Side). 157 MAF sensor circuit open. 158 MAF sensor shorted to power. 159 MAF sensor is out of Self-Test. 167 Insufficient TP input change. 171 Lack of HEGO switching (Rear Side). 172 HEGO sensor circuit indicates lean. (Rear Side). 173 HEGO sensor circuit indicates rich. (Rear Side). 174 Check for diluted engine oil. 175 Lack of HEGO switching (Front Side). 176 HEGO sensor circuit indicates lean. (Front Side). 177 HEGO sensor circuit indicates rich. (Front Side). 178 Check for diluted engine oil. 179 Fuel system at part throttle lean adaptive limit, system rich (Rear Side). 181 Fuel system at part throttle rich adaptive limit, system lean (Rear Side). 182 Fuel system at idle lean adaptive limit, system rich (Rear Side). 183 Fuel system at idle rich adaptive limit, system lean (Rear Side). 184 MAF sensor input voltage is greater than expected, in range. 185 MAF sensor input voltage is less than expected, in range. 186 Closed loop injector pulse width longer than expected. 187 Closed loop injector pulse width shorter than expected. 188 Fuel system at part throttle lean adaptive limit, system rich (Front Side). 189 Fuel system at part throttle rich adaptive limit, system lean (Front Side). 193 Flexible Fuel sensor circuit failure. 211 PIP circuit failure. 212 Loss of tachometer/IDM input. 213 EEC SPOUT circuit open. 214 CID circuit failure. 215 PCM detected coil 1 primary circuit failure. 216 PCM detected coil 2 primary circuit failure. 217 PCM detected coil 3 primary circuit failure. 218 Loss of ignition diagnostic monitor signal-left side. 219 Spark timing defaulted to 10 degrees, spark output circuit open. 221 Spark timing error. 222 Loss of ignition diagnostic monitor signal-right side. 223 Loss of dual plug inhibit control. 224 PCM detected coil 1, 2, 3 or 4 primary circuit failure. 225 Knock not sensed during dynamic response test KOER. 226 Ignition diagnostic monitor signal not received. 232 PCM detected coil 1, 2, 3 or 4 primary circuit failure. 238 PCM detected coil 4 primary circuit failure. 241 Ignition control module to PCM ignition diagnostic monitor pulse width transmission error. 244 Cylinder￼ Identification circuit fault present when cylinder balance test requested. 311 Secondary air injection system inoperative during KOER self-test (bank #1). 312 Secondary air injection system misdirected during KOER self-test. 313 Secondary air injection system not bypassed during KOER self-test. 314 Secondary air injection system inoperative during KOER self-test (bank #2) 326 PFE sensor circuit voltage lower than expected. 327 PFE sensor circuit voltage below Self-Test minimum. 328 Exhaust gas recirculation valve position sensor closed voltage lower than expected. 332 Insufficient EGR flow. 334 Exhaust gas recirculation valve position sensor closed voltage higher than expected. 335 PFE sensor circuit voltage out of Self-Test range. 336 PFE sensor circuit voltage higher than expected. 337 PFE sensor circuit voltage above Self-Test maximum. 338 Engine coolant temperature lower than expected (thermostat￼ test). 339 Engine coolant temperature higher than expected (thermostat test). 341 Octane adjust service pin open. 381 Frequent A/C clutch cycling. 411 Cannot control RPM during KOER low RPM check. 412 Cannot control RPM during KOER high RPM check. 415 Idle Air Control system at maximum adaptive lower limit. 416 Idle Air Control system at upper adaptive learning limit. 452 Insufficient input from VSS. 453 Servo leaking down. 454 Servo leaking. 455 Insufficient RPM increase. 456 Insufficient RPM decrease. 457 Speed control command switch(s) circuit not functioning. 458 Speed control command switch(s) stuck/circuit grounded. 459 Speed control ground circuit open.