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2005 Grand Prix GT with P0507 code

Old 06-02-2019, 02:45 PM
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Default 2005 Grand Prix GT with P0507 code

I keep getting a P0507 code that puts the car into "Limp Home Mode" intermittently. There are no other codes other than this one. When the code is not displayed the engine runs fine.... I can't hear any vacuum leaks, and the car does not have an IAC as it'* all computer controlled..... New Throttle Body?? Ideas.....??
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Old 06-02-2019, 05:14 PM
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I would check to make sure the throttle body / butterfly is opening properly & is not binding.
Have you ever cleaned the TB?
Vac leak..Spray some carb cleaner along bottom of Intake, does the idle rpm change at all?
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Old 06-02-2019, 06:00 PM
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Have you tried an idle relearn?
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Old 06-02-2019, 06:01 PM
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Also.....throw on a new PCV valve.....OEM...
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Old 06-02-2019, 07:19 PM
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Just got car and don't know history. Idles well and no "fast idle".or anything .... Seems to run fine until it goes into Reduced Power" mode. I was surprised it is showing fast RPM because the RPM seems to be fine.
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Old 06-02-2019, 07:25 PM
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Originally Posted by dandyd View Post
Just got car and don't know history. Idles well and no "fast idle".or anything .... Seems to run fine until it goes into Reduced Power" mode. I was surprised it is showing fast RPM because the RPM seems to be fine.
Do a relearn.
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Old 06-02-2019, 11:19 PM
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I have done a relearn..... it'll run fine for about 10 minutes, then it shows the 507 code and goes into Reduced Power.....I pulled off the throttle body and it looked really really clean, but I cleaned it again what I could..... my scanner is showing that it has a high LTFT at Idle (+25-+30)...... that'* a sign of a vacuum leak..... But I ran a smoke test and don't see any smoke from anywhere except a small amount coming out from the breather which is normal....... I've got a vacuum leak somewhere I just have to find it....... I'm wondering if the EGR could be the problem........ hmmm
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