line in between Intk manifold and map sensor?

[jesse0880]

i noticed the vacumm line inbetween the intake manifold and the map sensor (the sensor next to the diagnostic port) has a jet in the middle of it. in my mannual there is no sign of a jet designed to be there. is the jet there on any one elses car?

[JekylandHyde]

Do you have the turbo model?

If so, there is nothing from the factory on that line.
It just is a direct vac line from the manifold to the MAP.

Some people cork that line to get rid of fuel cut.
What do you mean by a "jet."

Does your factory boost gauge work?
All the MAP sensor does is control fuel cut and the OEM boost gauge.

[jesse0880]

yes, its a 91t with the tdo6 on it. my mannual calls the little circular plastic thing ( like the one on the vacum line going to the by pass valve) a jet. i just bought a boost gauge and i used the line going to the map sensor for the gauges source and all it gives is vacum. but ill put a straight line on and see what will happen.

[JekylandHyde]

It sounds like they put in a check-valve.
It allows air flow one way, but not the other.
I would say to get rid of it.

[Piddy]

Mine has that too...... weird... JDM Gen2 3SGTE... what motor do you have?

[jesse0880]

maybe. when i bought the car for 500 bucks, the head on the original motor was warped beyond repair so i bought a 3sgte from japan. so im not sure which motor that vacum line is from so i'll say probably