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COMMON QUESTION..

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Old 04-15-2009, 06:46 PM
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5.0 85 GT
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hey guys, i have a 97 cobra...check engine light went on today...took it to autozone rana diag.. my 02 sensor went bad which i dont care about...but it said my MANF. IDLE Malfunction....so i am assuming that is my IAC...the car has a rolling idle of 1500 rpms..which is way hi, and a reg idle of 1k rpms...which is also high, how do i clean or correct that? and where is it located on the 4.6 DOHC?
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Old 04-15-2009, 07:33 PM
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What were the exact codes?
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Old 04-15-2009, 07:48 PM
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uhh bank 2 sensor 1...for the 02 sensro....and it said MANF. IDLE MALF....and that was it it said the same thing twice once was pending..
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Old 04-15-2009, 10:24 PM
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You need the exact codes. There are 8 or 9 possible codes for each of the O2 sensors, some of which mean the sensor is bad and some that mean the sensors is reporting a problem.

Also, there are a dozen or more codes that have to do with idle speed control.

Here's my DTC lookup page that will provide posible causes and suggested fixes and diagnostic tips for each code...
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Old 04-15-2009, 11:02 PM
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ok, thanks, i didnt pay attention at the time because i am so used tot he 02 sensor light on these things that i didnt care..i will go back again to get the idle one..thanks
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Old 04-15-2009, 11:05 PM
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this may not be the exact one..but this was what it looked like/seemed to be..again my rolling and dead stop idles are very high....

P0505 - Idle Air Control System Malfunction
top

The PCM attempts to control engine speed during KOER self-test. The test fails when the desired rpm could not be reached or controlled during the self-test.


* IAC circuit open
* VPWR to IAC solenoid open
* IAC circuit shorted to PWR
* Air inlet is plugged
* Damaged IAC valve
* Damaged PCM



The IAC solenoid resistance is from 6 to 13 ohms. Monitor IAC PID duty cycle and/or voltage.

P0506 - Idle Air Control System RPM lower than expected
top

The PCM attempts to control engine speed during KOER self-test. The test fails when the desired rpm could not be reached or controlled during the self-test.


* IAC circuit shorted to PWR
* VPWR to IAC solenoid open
* IAC circuit open
* Damaged IAC valve
* Damaged PCM
* Air inlet is plugged



The IAC solenoid resistance is from 6 to 13 ohms. Monitor IAC PID duty cycle and/or voltage.

P0507 - Idle Air Control System RPM higher than expected
top

The PCM attempts to control engine speed during KOER self-test. The test fails when the desired rpm could not be reached or controlled during the self-test.


* IAC circuit shorted to ground
* Damaged IAC valve
* Damaged PCM
* Air intake leak after throttle body



The IAC solenoid resistance is from 6 to 13 ohms. Monitor IAC PID duty cycle and/or voltage.

P0511 - Idle Air Control Circuit Malfunction
top

The PCM attempts to control engine speed during KOER self-test. The test fails when the desired rpm could not be reached or controlled during the self-test.


* IAC circuit open
* VPWR to IAC solenoid open
* IAC circuit shorted to PWR
* Damaged IAC valve
* Damaged PCM



The IAC solenoid resistance is from 6 to 13 ohms. Monitor IAC PID duty cycle and/or voltage.
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Old 04-15-2009, 11:06 PM
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sorry posted 2wice by accident

Last edited by 5.0 85 GT; 04-15-2009 at 11:07 PM. Reason: double post by accident
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Old 04-16-2009, 07:03 AM
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Ok, thats good information, but do you know what any of it means? Like Cliffy said, you have to get us the actual codes
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Old 04-16-2009, 08:47 AM
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i have no idea what nay of that means...i will depart from the house now and get the exact codes for you guys..thanks for your help
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Old 04-17-2009, 03:26 PM
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OK, Here are the Exact Codes

MANF. CNTRL. Vehicle SPD. Idle Speed Control Aux Inputs

02 Sensor Heater Circuit Malfunction BAnk1 Sensor 2...

If any one knows how to fix these..id appreciate it
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