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The intake manifold is on top of the engine. and the service port is a valve stem that is built into the fuel rail that holds the injectors into the Intake.
Here are instructions.DOWNLOAD HERE
Before you drain, how much fuel do you have it it?
No , its no the IAC for sure. Theses are lean codes due to in 99% of all cases from a vacuum leak.
Got pictures but I can't get them to compress to under 1MB. Anyway, the 4-5in tube that connects the hard plastic hose coming from the PCV to one of the two tubes going in the top of the intake looks a bit worn. The upper hose going in the intake goes to the IAC and the lower one goes to the PCV. Do you think regular autoparts stores would have this small peice?
I took a close look and I don't see any visible holes or cracks. But where the hard plastic pcv hose connects into the small 4" soft rubber hose(that goes into the intake), it's not real snug. But the end that goes into the intake, I don't see anything wrong. The rubber looks weathered and you can see small cracks when you squeeze it. Could it be sucking a small amount of air where it's not fitting snug?
You are talking about that small 4" piece correct?