Question about 2002 Chevrolet Impala

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2002 Chevrolet Impala with 3.8 L V6: Car throws code P106. We have replaced the sensor over the PCV valve and I have meticulously gone over every hose that connects to the intake manifold. We replaced several O-rings that go into the manifold and retorqued the manifold properly. I also cleaned the PCV valve and replace the O-Ring that seats it. Still throws the code. Also runs rough on damp days for a few minutes or when it is cold. Otherwise engine sounds and runs great.

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  • johnco71 Jun 22, 2009

    Thanks Jaybydn91. Good info. The last fella told us to change the air temp and water temp sensors. I did and there was no change. Also replaced entire PCV Valve assembly and O rings and have retorqued the entire intake manifold properly. Still no change.

    I do think it is in the MAP sensor circuit, but do not know how to check that circuit. On days when it is really acting up, you can hear the MAP cycling the PCV valve rapidly, like it is going nuts.

  • jaybyrdn91 May 11, 2010

    I hope you end up finding a stubborn old vacuum leak that's hidden well somewhere. The only way to test the map sensor circuit is with a TECH 2 and a diagnostic flow chart that shows you what parameters to look for on the TECH 2 while performing different tests on the MAP sensor using the TECH 2. Therefore, u will have to take your Impala to the GM dealership. Good Luck ! ! And please lemme know how you make out.

  • Richard Dean
    Richard Dean May 11, 2010

    try the emission control... EGR

  • jaybyrdn91 May 11, 2010

    The sensor you are refering to is the Manifold Absolute Pressure Sensor (MAP). Obviously it is not the sensor because you have replaced it and the problem still persists. Hook a vacuum guage up. To do this, remove the vacuum line at the brake booster and attatch the vacuum guage here. Start the engine and leave it at idle. The guage should read 18-23 inches of mercury if there is no vacuum leaks. If it is within that parameter, then it is an electrical problem such as a short, high resistance, or an open circuit for example within the MAP sensor circuit. Even a malfunctioning ECM (Engine Control Module) could be the culpret. If it is lower than the parameter listed above. There is a vacuum leak hiding somewhere. To help find the leak, try spraying brake clean around the intake manifold and vacuum lines. While doing so, if the engine increases its RPM's you have found the leak. While reading the vacuum guage you see the needle flutters rapidly back and forth below 18 inches of mercury, you have a sticking intake valve in which the heads will need to be pulled off and checked to locate and see which intake valve it is and why it is not seating properly.



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p0300 it means you have multiple missfires if you have a coil pack on this model it could be a bad coil or timing is off can do then same but usually a p0300 or example p0301 is a misfire on number 1 cyl as well p0302 and so on you should of stopped after plugs and wires this usally solves the problem or even the pcv valve now i would go back to the first step code p0300 they have precedures to follow but you do not have to replace the engine like they suggest maybe a simple compression test would show if the motor is sick but i would go back to basics and start new before going in head first

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