Car running lean

[formatzero]

Had engine management light come on and garage identified car running extremely lean.Turns out this is due to air being drawn in  a small metal tube on the left hand side of the  Motordyne plenum cover.Garage dont know if this should have a tube fitted to it or it should be blanked off as blanking it off returns fuel levels perfectly,anyone any clues?cheers

[ZMANALEX]

Picture please:

[formatzero]

23 minutes ago, ZMANALEX said:

Picture please:

https://www.bing.com/images/search?view=detailV2&ccid=1fMxQfAx&id=A19D6394EF55711C78617C0D354D397C4D02D1F3&thid=OIP.1fMxQfAxFEDgolen66rkbwHaFQ&mediaurl=http%3a%2f%2fwww.five-fifths.com%2fskyline%2fupperIMC.jpg&exph=426&expw=600&q=350z+plenum+diagram&simid=608011225636603241&ck=DB6F858BAD10863E5C2881B34387D47D&selectedIndex=0&FORM=IRPRST&ajaxhist=0

 

Pipe coming out beside bolt 11

[ZMANALEX]

Blank off.

[formatzero]

Thanks Alex,top man as usual

[msitpro]

lol - change the fuelling via a remap and you'll gain power 

 

I'd love to suddenly find my engine running lean while still giving normal power - means there's more power on the table.

[davey_83]

I had a vac leak post throttle body and it made my engine run rich as the ECU was trying to save the engine. Leak was from a catch can hose plumbed to the port near the one you mentioned. Mpg on a run went down 12 which was alarming.

 

 

[formatzero]

8 hours ago, davey_83 said:

I had a vac leak post throttle body and it made my engine run rich as the ECU was trying to save the engine. Leak was from a catch can hose plumbed to the port near the one you mentioned. Mpg on a run went down 12 which was alarming.

 

 

Alarming to say the least