[Houston]: Irregular Idle
Irregular Idle
I need a Local, someone with a lot of P0507 experience. 
If you read the video discription I've done it all, replaced the TB (X2), checked all the vaccum lines, checked the PCV, cleaned the MAFS, did ALL the relearns and it still keeps coming back. Another problem is in the mornings, after the car has warmed up. I'll head off to work hit the 45-S, and you know in Houston, if you put your blinker it means, "Please speed up and cut me off so I can't merge." LOL Anyway when I run into this type of driver I want to come out on top, so I gun it, but when it get's to 3500-4000RPMs power goes limp...I'll stomp on the accelartor over and over but it won't budge. After a few miles I'll try again, and guess what.... IT WORKS. I don't know what to do... 
Please Help 
Here are the vid.s I posted on YouTube:
http://www.youtube.com/watch?v=W4d-b2n7Ljg
http://www.youtube.com/watch?v=k_R_no-RLAQ
If you read the video discription I've done it all, replaced the TB (X2), checked all the vaccum lines, checked the PCV, cleaned the MAFS, did ALL the relearns and it still keeps coming back. Another problem is in the mornings, after the car has warmed up. I'll head off to work hit the 45-S, and you know in Houston, if you put your blinker it means, "Please speed up and cut me off so I can't merge." LOL Anyway when I run into this type of driver I want to come out on top, so I gun it, but when it get's to 3500-4000RPMs power goes limp...I'll stomp on the accelartor over and over but it won't budge. After a few miles I'll try again, and guess what.... IT WORKS. I don't know what to do... Please Help Here are the vid.s I posted on YouTube:
http://www.youtube.com/watch?v=W4d-b2n7Ljg
http://www.youtube.com/watch?v=k_R_no-RLAQ
Last edited by huligan1475; Sep 21, 2009 at 12:26 PM.
So true...
Just curious how you "cleaned the MAFS?" If I'm not mistaken, it's a hot wire MAF which cleans itself and there is only one.
Originally Posted by www.obd-codes.com
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.
Potential Symptoms
Most likely you'll notice the idle speed is higher than normal. There are potentially other symptoms as well. Of course, when trouble codes are set, the MIL (malfunction indicator lamp, a.k.a. the check engine light) illuminates.
Causes
A P0507 DTC trouble code may be caused by one or more of the following:
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
Possible Solutions
This DTC is more of an informational code, so if there are any other codes set, diagnose them first. If there are no other codes, inspect the intake air system for air or vacuum leaks and damage. If there are no symptoms other than the DTC itself, just clear the code and see whether it returns.
If you have an advanced scan tool that can interact with the car, command the idle higher and lower to see if the engine responds appropriately. Also check the PCV valve to see if it's blocked and needs to be replaced. Check the IAC (idle air controller) if equipped, verify it's operation. If available, try swapping in a new throttle body to see if that fixes the problem. On Nissan Altimas and possibly other vehicles the problem may be fixed by having the dealer perform an idle air relearn procedure, or other relearn procedures.
Potential Symptoms
Most likely you'll notice the idle speed is higher than normal. There are potentially other symptoms as well. Of course, when trouble codes are set, the MIL (malfunction indicator lamp, a.k.a. the check engine light) illuminates.
Causes
A P0507 DTC trouble code may be caused by one or more of the following:
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
Possible Solutions
This DTC is more of an informational code, so if there are any other codes set, diagnose them first. If there are no other codes, inspect the intake air system for air or vacuum leaks and damage. If there are no symptoms other than the DTC itself, just clear the code and see whether it returns.
If you have an advanced scan tool that can interact with the car, command the idle higher and lower to see if the engine responds appropriately. Also check the PCV valve to see if it's blocked and needs to be replaced. Check the IAC (idle air controller) if equipped, verify it's operation. If available, try swapping in a new throttle body to see if that fixes the problem. On Nissan Altimas and possibly other vehicles the problem may be fixed by having the dealer perform an idle air relearn procedure, or other relearn procedures.
Last edited by Robert_K; Jun 26, 2009 at 06:15 AM.
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