map sensor on 2003 GMC Envoy

map sensor keep going off/on replace the sensor and catalytic converter still occurs

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1 answer 4 comments
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
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 .
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
manifold absolute pres./barometric pres. circ code p0105
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~R0~OD~N/0/89012112/94695199/94695254/94695258/34853741/34857029/34857030/34857663/122915129/105258193/105263683

Roy