Quote:
Originally Posted by AXracing
I am a little confused as to what you asked. All the GMC manifolds I have ever seen have 1 or no lambda sensors. Have Have started building a dummy sleeve in to it or some one has drilled a extra hold to fit a air fuel ratio readout? Where did you get it from? If you got it direct from GMC I would recommend giving him a call. If you got it used your probably best posting a photo if it so we know what were dealing with.
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Got the manifold from myself.
It has the original lambda hole at the bottom collector, and it also has another one that was place on one of the 4 primaries (for an AFR gauge).
Stu - 1st one needs to be plugged in. 2nd one is used as a comparison to ensure the CAT is working. Obviously with this manifold there is now no CAT - so as long as the air the 2nd sensor is reading is cleaner than that of the first sensor - no EM light.
Probably easiest is to plug 1st sensor in. Get a lambda sleeve for the 2nd sensor. And then for the 2nd hole in the manifold, either a blanking plug (i've seen them before, but couldn't tell you where sales them) or put in a dead sensor with the wires cut so the hole is filled and wires don't get in the way.