MAP Sensor tube?
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Joined: Jul 2005
Posts: 671
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From: Plano TX
MAP Sensor tube?
Does anyone know what the 4-5mm tube that plugs into the MAP sensor is? Mine is popped out and I'm about to go pull the Fuel rails to try and push it back in. I'm getting a hissing (sounds like air ) and I think it is coming from here.
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Joined: Dec 1999
Posts: 32,910
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
I was about to exit this post without answering because i couldnt figure out what you were trying to do. Ohhh, ya,,,,,, i know EXACTLY what your talking about now! 
There are TWO hoses. The large one goes to the power brake booster amd the small one goes to the HVAC system. The small plactic line supplies vacuum to the vacuum resivour tank in the passengers fender well. From that vacuum tank, two lines exit and go to the A.I.R. pump and to the HVAC vent door system. If you turn on your heat or AC, you will find that all of the air is coming out of the defrost and you cant control any of the outer positions! The doors are vacuum controled.
I have pictures of the line and the little rubber 90 degree fitting that connects the line to the MAP sensor. YES you will hear the vacuum leak and yes it will effect your drive ability during cold idle and low engine speeds. Im at work and cant post pic right now.
Bill C
There are TWO hoses. The large one goes to the power brake booster amd the small one goes to the HVAC system. The small plactic line supplies vacuum to the vacuum resivour tank in the passengers fender well. From that vacuum tank, two lines exit and go to the A.I.R. pump and to the HVAC vent door system. If you turn on your heat or AC, you will find that all of the air is coming out of the defrost and you cant control any of the outer positions! The doors are vacuum controled.
I have pictures of the line and the little rubber 90 degree fitting that connects the line to the MAP sensor. YES you will hear the vacuum leak and yes it will effect your drive ability during cold idle and low engine speeds. Im at work and cant post pic right now.
Bill C
