Sigma map sensor

[evotell]

On the map sensor for the Sigma there's a small pipe that appears to have some type of hose fit to it. Does anybody know where it goes to?

[ChrisC]

150 or 125?

 

I understand on the 125 its connected to the inlet manifold, where are the 150 its open to the air (assuming the 150 has the revision H map)

 

 

[ChrisC]

Should say I am not sure on the 140, assume it the same as the 125.

 

[evotell]

its a 125, the book indicates that it connects to the throttle body, but for the life of me I cant see any where for it to connect.

[evotell]

Found it. Thanks Chris

[John Hughes]

It is open to atmosphere on 140/150 (on early 150's it attached to a throttle body but most were changed to updated mapping and it is open to atmosphere to cure "lumpy" running)

 

Attaches to the throttle body on 125 it attaches to a small brass pipe that comes off the underside of the throttle body

 

Edited by - John Hughes on 20 Feb 2014 14:20:59

[DJ.]

On my 125 it attaches to a plastic tube on the inlet manifold as Chrisc said.

 

Duncan

[Martin J]

On the 140 & 150 that are left open to atmosphere, watch out for water ingress.

There was a recent thread on this & it prevented the engine from starting.

It was considered a worthwhile thing to fit a short section of tubing to the map sensor, loop it in a gentle bend to face downwards & fix in place.

 

my youngest Daughter (9 at the time) was very proud to fit the map sensor pipe on my build. I just couldn't my plates of meat big fingers down the gap to the nipple on the throttle body. Her slender hand accomplished the task in seconds.

 

 

[evotell]

Quoting Martin Jeffrey: 

my youngest Daughter (9 at the time) was very proud to fit the map sensor pipe on my build. I just couldn't my plates of meat big fingers down the gap to the nipple on the throttle body. Her slender hand accomplished the task in seconds.

 

Nice story