Where does the vacuum line go that runs from the back of my Quad?
I had my check engine light come on , found out it had something to do with the ( MAO or BARO ) sensor cant remember( its the one on the driver side close to the windshield). anyways I tried running a diffrent line from the back of the carb to the sensor , and the light never did come back on. My question is The original vacuum line came out of the back of the carb and went into one of those plastic wraps that cover the wires . Does that vacuum line split off and go anywhere else?


Thanks
David

 

No, it doesn't split. It's a direct run. That's the MAP sensor, BTW; Manifold Absolute Pressure, which basically means that at a perfect vacuum it will report 0 psi to the ECM, at atmospheric pressure it will report 14.7 psi, and at various values of vacuum it will report something in between.

Sounds like maybe your OE vacuum line is broken or something, and when you ran a new line, you fixed it.

That line needs to respond as quickly as possible to changes in manifold vacuum. So if your OE one is bad, it's best to go get some more of that same stuff, which is a small diameter (less air has to move back and forth in it in order for the sensor to "see" the real engine vacuum) and has rigid walls so that the line itself doesn't change size and shape according to the vacuum, and therefore alter the signal to the sensor.

 

Thanks for your response

David