Question about 2005 Pontiac Grand Prix

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Throttle being limited on my 05 grand prix..V6 supercharged

The other day the car konked out...pulled over...started up ok. Now when revving up it hits about 4500 rpm and stops..won't go higher no matter if the peddle is to the floor. Seems to me the computer is limiting but no fault lights are on. Any ideas what's up?

I recently put in what I think is 10W40 in it. I just went through the manual and it specifically states to only use 5W30...could this be an issue (I just put 5W30 back in)?

Thanks,
Tom

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  • 4 more comments 
  • tllewis2 Mar 12, 2009

    The car has 73k miles on it...I would not think that would be the problem but I'll check it out...thanks

  • tllewis2 Mar 14, 2009

    How do I check to see if the Cat is plugged without buying a new one($600) and putting it in? I took the old one out of the car and the RPM's still only go to 4500 (very loud), though I would somewhat expect this because the sensor on the down stream side of the Cat is no longer connected.
    Thanks,
    Tom


  • tllewis2 Mar 14, 2009

    I have checked my local Napa and Kragen shops and they don't have the new converters for California...the only source I have found is from a dealer :( Seems as though a new law went into affect the first of the year and they had to return their older stock because it was no longer authorized. (you gotta love this state) Maybe I can have a non-authorized unit welded in and make due for now...I'll have the old unit tested this afternoon.
    Thanks,
    Tom


  • tllewis2 Mar 14, 2009

    Does the fact that the engine only goes to 4500 without the cat installed mean the problem is not with the cat?

  • tllewis2 Mar 14, 2009

    Ok...had the Cat checked out and its fine...reinstalling now...thought I would clean the MAF sensor next.

  • tllewis2 Mar 14, 2009

    Ok...I removed and checked the Cat and its ok...put it back in.

    Removed and cleaned the MAF sensor...no change

    It seems to be missing on its way up to 4500 rpm.

    Any other suggestions would be very helpful.

    Thanks,

    Tom


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  • Master
  • 4,669 Answers

I would check for a plugged catalytic converter.

Posted on Mar 12, 2009

  • 3 more comments 
  • Clint Smock
    Clint Smock Mar 12, 2009

    I've seen these cars with less mileage have this problem. Don't rule it out.

  • Clint Smock
    Clint Smock Mar 14, 2009

    The downstream O2 sensor won't effect the way the engine runs. You can test it with a backpressure gauge. Have an exhaust shop test it. Also you can buy aftermarket universal converters for 100 dollars that you can have welded into your exhaust system.

  • Clint Smock
    Clint Smock Mar 14, 2009

    My brother lives in California, that state sucks for car issues.

  • Clint Smock
    Clint Smock Mar 15, 2009

    Any check engine light?

  • Clint Smock
    Clint Smock Mar 15, 2009

    Yea I'd say that if it does it with the exhaust of that isn't it.

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I do not know if you have the 3.1L V6 or the 3.8L (including Super Charger) V6; however I have included both below...

For the 3.1L V6:
Firing Order:
1-2-3-4-5-6
Cylinders:
......(back).......
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____________
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___
o 2
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___
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Let me know if this helped, or if you have additional information or questions. Feel Free to contact us at FixYa.com!

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HERE is a great website that has a ton of very useful information, regarding this and many other Grand Prix topics.

Hope this helps and thanks for using FixYa!

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