Hi,
Just a question about what is this thing doing? Must it be connected by vacuum hose to the back of TBI carb or? As I saw today on my friends Camaro 1992 it was connected, on mine Camaro 1991 (TBI 350) it was disconected and just bolt was screwed in pipe.
Thanks in advance for the help.

 

MAP sensor.

 

Must it be connected by vacuum hose to the TBI carb? And why it was disconnected in my Camaro? Thank You.

 

I don't know about TPI and TBI cars, but on CC carb cars, that's the barometric pressure sensor. If EFI is the same as CC carb, it shouldn't have anything but a wiring harness connector hooked up to it.

But, I've never had an EFI 3rd gen, so I couldn't tell you for sure.

 

Maybe you're right, but why would a baro sensor have a vacuum line?

 

Because somebody saw what looked like a vacuum hose nipple on the bottom of it, and assumed it needed a vacuum hose connected to it.

Happens a lot on the Carburetor forum.

But, I'm not sure about EFI.

 

I faund some info. It looks like MAP sensor, like in this listing http://cgi.ebay.com/ebaymotors/NEW-M...spagenameZWD1V

So the question is what does this little thing do? And must it be connected to TBI carb by vacuum line or let it leave disconnected like it is now in my Camaro?
Thank You.

 

http://www.autozone.com/R,1608610/ve...ductDetail.htm

 

I understand there's a MAP sensor somewhere on the car. Is there another sensor like that over in the in the driver's side rear corner of the engine compartment? That's where the MAP sensor is on CC carb cars.

Again, I don't know for a fact it's the BPS, because I don't have any EFI cars. But, it's mighty suspicious to me that it's in exactly the same mounting location as the BPS on CC carb cars.

As for what it does, it's input to the computer for vital operating operation. Whether it's the BPS or MAP.

 

I found what it is and what for the MAP sensor is. Here is the info:

The MAP sensor checks for variations in intake-manifold pressure. When everything is functioning normally, vacuum varies depending on engine speed and load. The MAP sensor relays this manifold-vacuum information to the engine's computer, which then regulates fuel and spark accordingly.

So I found it disconnected on my car. Should I leave disconnected it or should I connect it back? My car is chiptuned, so maybe the MAP sensor is not needed anymore?

 

I don't know how things are programmed on your car. Usually you would leave the MAP sensor connected. It shouldn't hurt to connect it back up and see how she runs. It may run better. In the picture it looks as though it is connected. Also, was that AC removed from your car too? I can see your heater core!

 

It was just vacuum line disconnected from TBI carb to MAP sensor when I get the car.
Yes, I have removed AC and installed non AC heater box.

 

Hook it up. See what happens. I believe with it disconnected you should be running rich. I could be wrong though.

 

I will try to drive with connected and disconnected. Let see if I'll notice the difference.

 

the tpi cars didnt have a map sensor they used a MAF sensor the 91-92 years used the map sensor since they went to speed density the TBI cars used MAP sensors i think though

 

On my carbed 87, the passenger side is the Baro sensor and does not have a vacuum line. The one on the driver side is the MAP sensor and is connected with a vacuum line. Take that bolt out of the nipple of the sensor because it can't sense atmospheric pressure with it in.