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2003 GMC Envoy Question: map sensor

 

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ernest moore, Mount Holly, NC, April 20, 2011, 08:17
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map sensor keep going off/on replace the sensor and catalytic converter still occurs

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    mastertech6371 April 20, 2011, 08:49
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     Master

    you need to find the real issue. map sensors do not go on and off. there could be a control problem.
    why did you replace the cat??

    Roy

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    ernest moore, April 21, 2011, 08:27
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    i replace the catalytic becacaue the map sensor is suppose to be the air flow through the manifold, and i had got a catalytic below threshold code reading before . will throttle body or the oxygen sensor cause the map sensor code to pop off/on .

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    mastertech6371, April 21, 2011, 08:36
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    no. the code was probably a 420 which is a cat code. the cat is longer working and must be replaced. the map sensor has little or no effect on your cat operation.

    Roy

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    ernest moore, April 28, 2011, 22:38
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    manifold absolute pres./barometric pres. circ code p0105

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    mastertech6371, April 29, 2011, 06:07
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     Master

    try this site. i hope it works which will show you what has to be checked for the failure.

    http://www.alldatapro.com/alldata/PRO~V216876810~C37496~R...

    Roy

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