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MAP sensor failing when warm

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MAP sensor failing when warm

  #1  
Old 12-06-2018, 12:30 PM
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MAP sensor failing when warm

When I start my truck up in the morning, there's no issues. However after it warms up, map shows no more than -.1 to 1.5, not it's normal pressure. As a result VGT is 15% and less than 2psi on the turbo. I have yet to take it apart yet, but I was curious if maybe it's loose, a hole in the tube leading to sensor, or something else. Every other thread i've seen about the MAP sensor is it's dead or not dead, so that's why I am confused. But I've been leaving in the dark and getting home in the dark so it's tough to get under the hood when the engine is cold to check it out.
 
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Old 12-06-2018, 02:14 PM
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When I got my used truck, I had a a bunch of codes for EGR, VGT and air flow stuff. I also had bad injectors... like failed injector not just stiction. My turbo wouldn't spool, and the boost gauge wasn't working... all in all, in the end my map sensor was bad and after replaceing the failed injector and running some archoil for remaining stiction all my codes went away... my turbo and boost gauge are perfectly fine.

I guess moral of the story is... if your map sensors bad you may get other codes for turbo and what not. Try to find a replacement map sensor that might be returnable if you "DONT INSTALL IT" wink wink.
 
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Old 12-07-2018, 11:30 AM
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It's strange, everything is perfect for the first 15min, then after that map completely dies. I'm off today so I'll poke my head under the hood. I have a feeling it's the hose since it's temperature related.
 
  #4  
Old 12-07-2018, 11:47 AM
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Originally Posted by JaySVX
It's strange, everything is perfect for the first 15min, then after that map completely dies. I'm off today so I'll poke my head under the hood. I have a feeling it's the hose since it's temperature related.
Did you check the map port where the hose goes to the intake ? Mine was clean that's why I knew it was the map sensor. But yours might be clogged.
 


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