Question about 2003 Chevrolet Silverado 1500

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I replaced my knock sensors the other day truck ran fine for a while then two more codes came up po107 and po449 where should i go know

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The two codes may refer to the same fault/ THe p0107 says that the Manifold absolute pressure is wrong in other words the amount of air gaining entry to your inlet manifold is incorrect. The P0449 says that the vent valve on the vapour emission control system is open. I think it is more than likely that the open vent valve is allowing air to be sucked into the inlet manifold and this is also being noted by the MAP sensor. If it easy replace the vent valve. A quick fix just to keep you going until the vent valve can be replaced is to locate the vacuum line supply from the vapour emission control charcoal canister and to clamp it closed. This will remove the MAP sensor error and allow the engine to run as it should. THis is only temporary as the vent valve fault will persist until it is fixed.

Posted on Aug 20, 2010

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Posted on Jan 02, 2017

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Just because your getting a code from a sensor doesn't mean the sensor is N/G. The MAP sensor reads the manifold air pressure, that can be anything from a vacuum leak, elec short, bad plug/wire, miss, gasket and the list goes on. It can be a bad sensor too, don't get me wrong. Does it run rough, hard start, did you ck the emissions? First things first Vacuum leaks & gaskets are popular. Once in a while I cross paths w/ a cracked manifold. Don't throw your $ out the window, Do it once & do it right. Good luck

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