Keith Browning Posted December 25, 2017 Share Posted December 25, 2017 I am seeing more of this lately. You get a truck in with a low power complaint and maybe a check engine light on or sometimes not. You may or may not have codes to help you diagnose but this can affect the turbocharger and the EGR system. If you find yourself starting to perform pinpoint tests for air management and come up empty, before you beat your head against the wall spend 30 seconds and remove the MAP sensor and look at it. If it is clogged try an new one. Even if it is within the voltage range when checking the pressure sensor input bias - the WSM wants to see Map_A within 5 kPa or 0.73 psi of the BARO reading. Twice now I have seen them within that spec but because they are clogged they cause low end boost concerns, sensor correlation codes and EGR flow codes. . Quote Link to comment Share on other sites More sharing options...
Steve Mutter Posted December 26, 2017 Share Posted December 26, 2017 A very high percentage of 6.7's i have worked on have plugged map sensors. I have gotten into the habit of always checking the map sensor when doing any kind of diagnosis and most of the time it does not leave a code but will be completely plugged. 1 Quote Link to comment Share on other sites More sharing options...
forddieseldoctor Posted December 27, 2017 Share Posted December 27, 2017 I’ll have to start looking at them. 1 Quote Link to comment Share on other sites More sharing options...
cbriggs Posted January 3, 2018 Share Posted January 3, 2018 Don't stick a drill bit or seal pick in them to attempt to clean them. Ask me how i know.... Quote Link to comment Share on other sites More sharing options...
forddieseldoctor Posted January 3, 2018 Share Posted January 3, 2018 11 hours ago, cbriggs said: Don't stick a drill bit or seal pick in them to attempt to clean them. Ask me how i know.... So then what is the recommended way to clean them? Or is it a replace only? Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted January 3, 2018 Author Share Posted January 3, 2018 I personally will never "clean" any sensor ever again particularly with a customers vehicle. By cleaning it you could damage the sensor or just not be able to do it effectively. Just because the hole is accessible the internal areas are not. As I recall they are not overly expensive to begin with but its not my money to begin with. How do I know? I tried it once and made it worse. Quote Link to comment Share on other sites More sharing options...
cbriggs Posted January 19, 2018 Share Posted January 19, 2018 Yeah i tried to clean one in a pinch one day. If you contact the electronics at the bottom of the hole it shorts out internally and renders it useless. I had to rob one off of a new truck instead to bale out my stranded customer. 1 Quote Link to comment Share on other sites More sharing options...
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