D2 Intake "What is this for" Question
#1
D2 Intake "What is this for" Question
Replacing my head gaskets on a 2001 D2 with 175K miles.
While preparing to remove the intake manifold I could identify two of three ports on the passenger side. The port that is pointed to by the red arrow has no hose attached. Can anyone tell me what it is?
Thanks!
While preparing to remove the intake manifold I could identify two of three ports on the passenger side. The port that is pointed to by the red arrow has no hose attached. Can anyone tell me what it is?
Thanks!
#2
Last edited by LR03NJ; 01-22-2017 at 05:19 PM.
#6
#7
It should be capped. If not I'd expect you'd be getting lean codes (P1171 & P1174) due to unmetered air entering the intake manifold, which would likely hurt gas mileage as the ECU tries to add fuel to get to the designed air/fuel ratio. It's interesting to me that the '99-'02 DIIs have that port since I think SAI wasn't introduced until 2003. I might be wrong about that; California trucks may have had SAI from the beginning. I'm just grateful my truck doesn't have SAI.
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twin6 (01-23-2017)