I just finished my Iron LS1 and have it installed. The IAT reads between 250°F and 280°F. I am pretty sure this is what is making it run extremely rich. Tried a new maf sensor and same results. So I am thinking a wiring or tune issue. Any input would be helpful.
P.S.> Have not had time for much diag. have to go to a wedding tonight at 7.
99' Silverado RCSB Z71: 5.7L Iron LS1, 11.2:1, Custom EPS Cam, Ported 862's,Ported TB, E-Bay Cold Air, E-Bay Long Tubes, Dynomax X-Pipe Exhaust, Electric Fans, Innovative LC-1, Self Built 4L60E, Circle D Pro Single Disc, 4:10 ValueTrac
Do you happen to be getting p0171 and p0174? I'm having the same issue but I don't know what my iat's are at.
The only code I have is a random misfire from how rich it is.
Probably bad wiring, I know when the wiring is open, it'll read -30 or so, might be a shorted wire.
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I leaning towards a wiring issue. Will have more time to diag. tommorow.
fixed it, found several wires were pinched under the coolant tank.
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