boost & baro sensor

[matuva]

Any of you get the part # for these 2 sensors?

The boost or MAP (Manifold Absolute Pressure) one is on the intake, the baro is on the firewall. I've been browsing catalogs, and it seems they are confusing both, at least they can interchange, as they look very similar...

 

[someotherguy]

Looked up on NAPA using a 1994 C3500 6.5TD -

In the Echlin (NAPA) line, the boost sensor is CRB 216865; barometric pressure sensor (they still refer to it as a MAP sensor) is CRB 216521 - so while they look the same, they're definitely different part #'s.

In the Delphi line, the boost sensor is DEM PS10082; baro sensor is DEM PS10075. Funny thing is both of them are listed as MAP sensors but the additional information once you look at them, denotes which one is which.

Through Rockauto I was able to look up the AC Delco number for the baro sensor, part # 213185, has been superceded by part # 2131545. They don't seem to list the boost sensor in AC Delco.

Richard

 

[buddy]

While the Baro sensor is not connected to the manifold, it is still a MAP sensor, just not used that way. Kind of if we take the PMD off the pump, is it still a PMD, or just an FSD.

The Baro sensor is a 1-bar MAP and the Boost sensor a 2-bar MAP.

 

[matuva]

Thanks guys

 

[Brooklyn Tow]

So why did they lose the firewall 1Bar on the 96 and up......OBDII?

 

[Turbine Doc]

So why did they lose the firewall 1Bar on the 96 and up......OBDII?

Probably a cost reduction eliminate the unnecessary sensor

OBD-II S/L56 engines still have both sensors and added the MAF sensor in 97+ years IIRC to aid in meeting emissions

F/L65 engines OBD-II uses the 1 sensor on intake for both; takes baro reading @ startup that PCM reads & saves the info, then it uses the MAP only for boost pressure monitoring after startup

Have to be careful in what you order because they are so close in appearance you can get the wrong one easily especially since some of the parts catalog call them the same thing, the index pin/key where they plug in is in a different location/orientation that is supposed to prevent getting the wrong sensor connected

 

[ak diesel driver]

why not use the 2 baro for both?

 

[THEFERMANATOR]

why not use the 2 baro for both?

One no need for the extra expense of buying the 2 bar for a baro sensor, and 2 they run at a slightly different voltage range I believe. Some swap out the boost sensor for a 3 bar as it gives a different voltage range so the ECM doesn't code when you boost over 12 or so.

 

[ak diesel driver]

doesn't the 2 baro just have an extended range. seems like you could put the 3 baro in place of a 1 baro and still work normally but have extended range

 

[THEFERMANATOR]

doesn't the 2 baro just have an extended range. seems like you could put the 3 baro in place of a 1 baro and still work normally but have extended range

Nope, they all operate on a 0-5 volt signal.

http://injector-rehab.com/shop/mapsensor.html

 

[Drago]

how do you know if it's working correctly?


nevermind, read the above linky