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what is it and do i need it?

T

todd

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union center ny
i did away with my vaccume pump, wow is it quieter !!!!!!! but i have something on the firewall above the master cylender it is flat on top has a vaccume hose and a wire harness plug on the bottom so far i dont have any lights in the dash and see no adverse effects from letting the hose just hang but am really wondering
 
Crankme, does all of the trucks have the barometric sensor? I have basically the same truck and didnt have that sensor that I know of. I did the same with ditching the vacuum pump and had no problems, I only have the one vacuum solinoid for the turbo.
 
All of mine have the baro sensor. On the "F" engines it is just open to atmosphere[measures barometric pressure]. on a 2500 suburban it shouldn't have a hose on it.
 
Yup what BK said.

I do not believe the 93 & older DB2 setups have a baro sensor...hopefully BK or someone will confirm that for us...?

The S vin engines use that same baro sensor with the computer to verify check for the supplied vacuum to assure the EGR is getting what is expected.

Mine had the hose to do that before I swapped out my S chip for a tweaked F. With the new F chip I no longer need the vac hose hooked up to the baro sensor & my ECM now only uses the baro sensor to verify the altitude conditions.

Yearned way more then ever needed trouble shooting that baro sensor operation when my EGR solenoid chit the bed prior to it's deletion on my 1500.

HTH's,
69
 
The baro sensor acts like an altitude compensator... it measures ambient atmospheric pressure and feeds that information to the PCM which uses it to control and maintain an appropriate amount ot turbo-boost. (at higher altitudes, less baro pressure = more boost to get an equivalent amount of O2 into the cylinders with a given amount of fuel).

Replace that system with a TM like you have, and it becomes redundant, although it still feeds information back to the PCM. If you remove it, you should get codes, iirc.

I would just leave it alone...
 
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